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class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" 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Available in 7 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-7" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">7 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Sysctl" title="Sysctl – Czech" lang="cs" hreflang="cs" data-title="Sysctl" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/Sysctl" title="Sysctl – Persian" lang="fa" hreflang="fa" data-title="Sysctl" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Sysctl" title="Sysctl – French" lang="fr" hreflang="fr" data-title="Sysctl" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/Sysctl" title="Sysctl – Korean" lang="ko" hreflang="ko" data-title="Sysctl" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Sysctl" title="Sysctl – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Sysctl" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Sysctl" title="Sysctl – Russian" lang="ru" hreflang="ru" data-title="Sysctl" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Sysctl" title="Sysctl – Ukrainian" lang="uk" hreflang="uk" data-title="Sysctl" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3509049#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Sysctl" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:Sysctl" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Sysctl"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Sysctl&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Sysctl&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Sysctl"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Sysctl&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Sysctl&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Sysctl" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Sysctl" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Sysctl&oldid=1219949555" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Sysctl&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=Sysctl&id=1219949555&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FSysctl"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FSysctl"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Sysctl&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Sysctl&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3509049" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Unix-like software that manages kernel attributes</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="/wiki/Systemctl" class="mw-redirect" title="Systemctl">systemctl</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><style data-mw-deduplicate="TemplateStyles:r1248332772">.mw-parser-output .multiple-issues-text{width:95%;margin:0.2em 0}.mw-parser-output .multiple-issues-text>.mw-collapsible-content{margin-top:0.3em}.mw-parser-output .compact-ambox .ambox{border:none;border-collapse:collapse;background-color:transparent;margin:0 0 0 1.6em!important;padding:0!important;width:auto;display:block}body.mediawiki .mw-parser-output .compact-ambox .ambox.mbox-small-left{font-size:100%;width:auto;margin:0}.mw-parser-output .compact-ambox .ambox .mbox-text{padding:0!important;margin:0!important}.mw-parser-output .compact-ambox .ambox .mbox-text-span{display:list-item;line-height:1.5em;list-style-type:disc}body.skin-minerva .mw-parser-output .multiple-issues-text>.mw-collapsible-toggle,.mw-parser-output .compact-ambox .ambox .mbox-image,.mw-parser-output .compact-ambox .ambox .mbox-imageright,.mw-parser-output .compact-ambox .ambox .mbox-empty-cell,.mw-parser-output .compact-ambox .hide-when-compact{display:none}</style><table class="box-Multiple_issues plainlinks metadata ambox ambox-content ambox-multiple_issues compact-ambox" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span"><div class="multiple-issues-text mw-collapsible"><b>This article has multiple issues.</b> Please help <b><a href="/wiki/Special:EditPage/Sysctl" title="Special:EditPage/Sysctl">improve it</a></b> or discuss these issues on the <b><a href="/wiki/Talk:Sysctl" title="Talk:Sysctl">talk page</a></b>. <small><i>(<a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove these messages</a>)</i></small> <div class="mw-collapsible-content"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Primary_sources plainlinks metadata ambox ambox-content ambox-Primary_sources" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>relies excessively on <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">references</a> to <a href="/wiki/Wikipedia:No_original_research#Primary,_secondary_and_tertiary_sources" title="Wikipedia:No original research">primary sources</a></b>.<span class="hide-when-compact"> Please improve this article by adding <a href="/wiki/Wikipedia:No_original_research#Primary,_secondary_and_tertiary_sources" title="Wikipedia:No original research">secondary or tertiary sources</a>. <br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Sysctl%22">"Sysctl"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Sysctl%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Sysctl%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Sysctl%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Sysctl%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Sysctl%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">March 2015</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Sysctl" title="Special:EditPage/Sysctl">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Sysctl%22">"Sysctl"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Sysctl%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Sysctl%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Sysctl%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Sysctl%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Sysctl%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">November 2011</span>)</i></span><span 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(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">sysctl</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Example_of_sysctl_on_Linux_screenshot.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Example_of_sysctl_on_Linux_screenshot.png/220px-Example_of_sysctl_on_Linux_screenshot.png" decoding="async" width="220" height="249" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Example_of_sysctl_on_Linux_screenshot.png/330px-Example_of_sysctl_on_Linux_screenshot.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Example_of_sysctl_on_Linux_screenshot.png/440px-Example_of_sysctl_on_Linux_screenshot.png 2x" data-file-width="624" data-file-height="707" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/C_(programming_language)" title="C (programming language)">C</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="/wiki/Unix-like" title="Unix-like">Unix-like</a> (BSD)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/System_configuration" title="System configuration">System configuration</a></td></tr></tbody></table> <p><b>sysctl</b> is a software mechanism in some <a href="/wiki/Unix-like" title="Unix-like">Unix-like</a> operating systems that reads and modifies the attributes of the system <a href="/wiki/Kernel_(operating_system)" title="Kernel (operating system)">kernel</a> such as its version number, maximum limits, and security settings.<sup id="cite_ref-n-sysctl-7_1-0" class="reference"><a href="#cite_note-n-sysctl-7-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It is available both as a <a href="/wiki/System_call" title="System call">system call</a> for compiled programs, and an administrator command for interactive use and scripting. <a href="/wiki/Linux" title="Linux">Linux</a> additionally exposes sysctl as a <a href="/wiki/Virtual_file_system" title="Virtual file system">virtual file system</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="BSD">BSD</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sysctl&action=edit&section=1" title="Edit section: BSD"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In BSD, these parameters are generally objects in a <a href="/wiki/Management_information_base" title="Management information base">management information base</a> (MIB) that describe tunable limits such as the size of a shared memory segment, the number of threads the operating system will use as an <a href="/wiki/Network_File_System_(protocol)" class="mw-redirect" title="Network File System (protocol)">NFS</a> client, or the maximum number of processes on the system; or describe, enable or disable behaviors such as <a href="/wiki/Internet_Protocol" title="Internet Protocol">IP</a> forwarding, security restrictions on the <a href="/wiki/Superuser" title="Superuser">superuser</a> (the "securelevel"), or debugging output.<sup id="cite_ref-n-sysctl-7_1-1" class="reference"><a href="#cite_note-n-sysctl-7-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>In <a href="/wiki/OpenBSD" title="OpenBSD">OpenBSD</a> and <a href="/wiki/DragonFly_BSD" title="DragonFly BSD">DragonFly BSD</a>, sysctl is also used as the transport layer for the <a href="/wiki/Hw.sensors" title="Hw.sensors">hw.sensors</a> framework for <a href="/wiki/Hardware_monitoring" class="mw-redirect" title="Hardware monitoring">hardware monitoring</a>,<sup id="cite_ref-sensors-ieee07_2-0" class="reference"><a href="#cite_note-sensors-ieee07-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> whereas <a href="/wiki/NetBSD" title="NetBSD">NetBSD</a> uses the <a href="/wiki/Ioctl" title="Ioctl">ioctl</a> system call for its <a href="/wiki/Sysmon_envsys" class="mw-redirect" title="Sysmon envsys">sysmon envsys</a> counterpart. Both sysctl and ioctl are the two <a href="/wiki/System_call" title="System call">system calls</a> which can be used to add extra functionality to the <a href="/wiki/Kernel_(operating_system)" title="Kernel (operating system)">kernel</a> without adding yet another <a href="/wiki/System_call" title="System call">system call</a>;<sup id="cite_ref-onlamp-36_3-0" class="reference"><a href="#cite_note-onlamp-36-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> for example, in 2004 with OpenBSD 3.6, when the <a href="/w/index.php?title=Tcpdrop&action=edit&redlink=1" class="new" title="Tcpdrop (page does not exist)">tcpdrop</a> utility was introduced, sysctl was used as the underlying system call.<sup id="cite_ref-onlamp-36_3-1" class="reference"><a href="#cite_note-onlamp-36-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-tcpdrop_4-0" class="reference"><a href="#cite_note-tcpdrop-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> In <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a>, although there is no sensors framework, the individual temperature and other sensors are still commonly exported through the sysctl tree through <a href="/w/index.php?title=Newbus&action=edit&redlink=1" class="new" title="Newbus (page does not exist)">Newbus</a>, for example, as is the case with the <code>aibs(4)</code> driver that's available in all the 4 BSD systems, including FreeBSD.<sup id="cite_ref-sensors-abc2009_5-0" class="reference"><a href="#cite_note-sensors-abc2009-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-sensors-mmath_6-0" class="reference"><a href="#cite_note-sensors-mmath-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-aibs.4_7-0" class="reference"><a href="#cite_note-aibs.4-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>In BSD, a <a href="/wiki/System_call" title="System call">system call</a> or system call wrapper is usually provided for use by programs, as well as an administrative program and a configuration file (for setting the tunable parameters when the system <a href="/wiki/Booting" title="Booting">boots</a>). </p><p>This feature first appeared in <a href="/wiki/4.4BSD#4.4BSD_and_descendants" class="mw-redirect" title="4.4BSD">4.4BSD</a>. It has the advantage over hardcoded constants that changes to the parameters can be made dynamically without <a href="/wiki/Compiler" title="Compiler">recompiling</a> the kernel. </p><p>Historically, although kernel variables themselves could be modified through sysctl, the elements comprising the <a href="/wiki/Management_information_base" title="Management information base">MIB</a> of the sysctl tree were hardcoded at compile time, and as of 2019, it's mostly still the case in OpenBSD (with some exceptions like <a href="/wiki/Hw.sensors" title="Hw.sensors">hw.sensors</a>, which manages and provides its own dynamic subtree). FreeBSD has had "sysctl internal magic" for dynamic sysctl tree management since 1995; NetBSD has had its own implementation of a dynamic sysctl tree since December 2003.<sup id="cite_ref-sensors-abc2009_5-1" class="reference"><a href="#cite_note-sensors-abc2009-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-sensors-mmath_6-1" class="reference"><a href="#cite_note-sensors-mmath-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Linux">Linux</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sysctl&action=edit&section=2" title="Edit section: Linux"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In Linux, the sysctl interface mechanism is also exported as part of <a href="/wiki/Procfs" title="Procfs">procfs</a> under the <style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">/proc/sys</span> directory (not to be confused with <a href="/wiki/Sysfs" title="Sysfs">the <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">/sys</span> directory</a>). This difference means checking the value of some parameter requires opening a file in a <a href="/wiki/Virtual_file_system" title="Virtual file system">virtual file system</a>, reading its contents, parsing them and closing the file. The sysctl system call does exist on Linux, but it has been deprecated and does not have a <a href="/wiki/Wrapper_function" title="Wrapper function">wrapper function</a> in <a href="/wiki/Glibc" title="Glibc">glibc</a>; it is usually unavailable due to many distributions configuring the kernel without CONFIG_SYSCTL_SYSCALL; so it is not recommended for use.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sysctl&action=edit&section=3" title="Edit section: Examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When IP forwarding is enabled, the operating system kernel will act as a <a href="/wiki/Router_(computing)" title="Router (computing)">router</a>. In <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a>, <a href="/wiki/NetBSD" title="NetBSD">NetBSD</a>, <a href="/wiki/OpenBSD" title="OpenBSD">OpenBSD</a>, <a href="/wiki/DragonFly_BSD" title="DragonFly BSD">DragonFly BSD</a>, and <a href="/wiki/Darwin_(operating_system)" title="Darwin (operating system)">Darwin</a>/<a href="/wiki/Mac_OS_X" class="mw-redirect" title="Mac OS X">Mac OS X</a>, the parameter <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">net.inet.ip.forwarding</span> can be set to <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">1</span> to enable this behavior. In Linux, the parameter is called <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">net.ipv4.ip_forward</span>. </p><p>In most systems, the command <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">sysctl -w <i>parameter</i>=1</span> will enable a certain behavior. This will persist until the next reboot. If the behavior should be enabled whenever the system boots, the line <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced"><i>parameter</i>=1</span> can be added/rewritten to the file <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">/etc/sysctl.conf</span>. Additionally, some sysctl variables cannot be modified after the system is booted. These variables (depending on the variable, the version and flavor of BSD) need to either be set statically in the kernel at compile time or set in <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">/boot/loader.conf</span>. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sysctl&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output 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.reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-n-sysctl-7-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-n-sysctl-7_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-n-sysctl-7_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://bxr.su/n/share/man/man7/sysctl.7">"sysctl(7) — system information variables"</a>. <i>BSD Cross Reference</i>. <a href="/wiki/NetBSD" title="NetBSD">NetBSD</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=BSD+Cross+Reference&rft.atitle=sysctl%287%29+%E2%80%94+system+information+variables&rft_id=http%3A%2F%2Fbxr.su%2Fn%2Fshare%2Fman%2Fman7%2Fsysctl.7&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span></span> </li> <li id="cite_note-sensors-ieee07-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-sensors-ieee07_2-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFConstantine_A._Murenin2007" class="citation conference cs1">Constantine A. Murenin (2007-04-17). <a rel="nofollow" class="external text" href="http://sensors.cnst.su/IEEE_ICNSC_2007"><i>Generalised Interfacing with Microprocessor System Hardware Monitors</i></a>. Proceedings of 2007 IEEE International Conference on Networking, Sensing and Control, 15–17 April 2007. London, United Kingdom: <a href="/wiki/Institute_of_Electrical_and_Electronics_Engineers" title="Institute of Electrical and Electronics Engineers">IEEE</a>. pp. 901–906. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FICNSC.2007.372901">10.1109/ICNSC.2007.372901</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4244-1076-7" title="Special:BookSources/978-1-4244-1076-7"><bdi>978-1-4244-1076-7</bdi></a>. IEEE ICNSC 2007, pp. 901—906.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=conference&rft.btitle=Generalised+Interfacing+with+Microprocessor+System+Hardware+Monitors&rft.place=London%2C+United+Kingdom&rft.pages=901-906&rft.pub=IEEE&rft.date=2007-04-17&rft_id=info%3Adoi%2F10.1109%2FICNSC.2007.372901&rft.isbn=978-1-4244-1076-7&rft.au=Constantine+A.+Murenin&rft_id=http%3A%2F%2Fsensors.cnst.su%2FIEEE_ICNSC_2007&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span></span> </li> <li id="cite_note-onlamp-36-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-onlamp-36_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-onlamp-36_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFederico_Biancuzzi2004" class="citation web cs1">Federico Biancuzzi (2004-10-28). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20041029232336/http://www.onlamp.com/lpt/a/5302">"OpenBSD 3.6 Live"</a>. <i><a href="/wiki/ONLamp" class="mw-redirect" title="ONLamp">ONLamp</a></i>. <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>. 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Murenin (2010-05-21). "8.3. Sensors framework in FreeBSD CVS". <a rel="nofollow" class="external text" href="http://cnst.su/MMathCS"><i>OpenBSD Hardware Sensors — Environmental Monitoring and Fan Control</i></a> (<a href="/wiki/Master_of_Mathematics#Canada" title="Master of Mathematics">MMath</a> thesis). <a href="/wiki/University_of_Waterloo" title="University of Waterloo">University of Waterloo</a>: UWSpace. <a href="/wiki/Hdl_(identifier)" class="mw-redirect" title="Hdl (identifier)">hdl</a>:<a rel="nofollow" class="external text" href="https://hdl.handle.net/10012%2F5234">10012/5234</a>. Document ID: ab71498b6b1a60ff817b29d56997a418.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.title=OpenBSD+Hardware+Sensors+%E2%80%94+Environmental+Monitoring+and+Fan+Control.&rft.degree=MMath&rft.inst=UWSpace&rft.date=2010-05-21&rft_id=info%3Ahdl%2F10012%2F5234&rft.au=Constantine+A.+Murenin&rft_id=http%3A%2F%2Fcnst.su%2FMMathCS&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span></span> </li> <li id="cite_note-aibs.4-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-aibs.4_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://bxr.su/FreeBSD/sys/dev/acpi_support/atk0110.c">"aibs(4) — ASUSTeK AI Booster ACPI ATK0110 voltage, temperature and fan sensor"</a>. <i>BSD Cross Reference</i>. <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a>. 2010.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=BSD+Cross+Reference&rft.atitle=aibs%284%29+%E2%80%94+ASUSTeK+AI+Booster+ACPI+ATK0110+voltage%2C+temperature+and+fan+sensor&rft.date=2010&rft_id=http%3A%2F%2Fbxr.su%2FFreeBSD%2Fsys%2Fdev%2Facpi_support%2Fatk0110.c&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1">"aibs -- ASUSTeK AI Booster ACPI ATK0110 voltage, temperature and fan sensor". <a rel="nofollow" class="external text" href="https://www.freebsd.org/cgi/man.cgi?query=aibs&sektion=4&manpath=FreeBSD+8.2-RELEASE"><i>FreeBSD Manual Pages</i></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=aibs+--+ASUSTeK+AI+Booster+ACPI+ATK0110+voltage%2C+temperature+and+fan+sensor&rft.btitle=FreeBSD+Manual+Pages&rft_id=https%3A%2F%2Fwww.freebsd.org%2Fcgi%2Fman.cgi%3Fquery%3Daibs%26sektion%3D4%26manpath%3DFreeBSD%2B8.2-RELEASE&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span></li></ul> </span></li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://man7.org/linux/man-pages/man2/sysctl.2.html">"sysctl(2): read/write system parameters"</a>. <a href="/wiki/Michael_Kerrisk" title="Michael Kerrisk">man7.org</a>. 2017-09-15<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-01-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=sysctl%282%29%3A+read%2Fwrite+system+parameters&rft.pub=man7.org&rft.date=2017-09-15&rft_id=http%3A%2F%2Fman7.org%2Flinux%2Fman-pages%2Fman2%2Fsysctl.2.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASysctl" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sysctl&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="url"><a rel="nofollow" class="external text" href="http://mdoc.su/o/sysctl.2">sysctl(2) in OpenBSD</a></span></li> <li><span class="url"><a rel="nofollow" class="external text" href="http://mdoc.su/f,n,d/sysctl.3">sysctl(3) in FreeBSD, NetBSD, DragonFly BSD</a></span></li> <li><span class="url"><a rel="nofollow" class="external text" href="http://mdoc.su/n/sysctl.7">sysctl(7) in NetBSD</a></span></li> <li><span class="url"><a rel="nofollow" class="external text" href="http://mdoc.su/-/sysctl.8">sysctl(8) in *BSD</a></span></li> <li><span class="url"><a rel="nofollow" class="external text" href="http://mdoc.su/f,d,n/sysctl.9">sysctl(9) in FreeBSD, DragonFly and NetBSD</a></span></li> <li><span class="plainlinksneverexpand"><code><a rel="nofollow" class="external text" href="https://manned.org/sysctl.8">sysctl(8)</a></code></span> – <a href="/wiki/Linux" title="Linux">Linux</a> Programmer's <a href="/wiki/Man_page" title="Man page">Manual</a> – Administration and Privileged Commands</li> <li><span class="plainlinksneverexpand"><code><a rel="nofollow" class="external text" href="https://manned.org/sysctl.2">sysctl(2)</a></code></span> – <a href="/wiki/Linux" title="Linux">Linux</a> Programmer's <a href="/wiki/Man_page" title="Man page">Manual</a> – System Calls</li> <li><a rel="nofollow" class="external text" href="https://sysctl-explorer.net">sysctl-explorer.net</a> – An initiative to facilitate the access of Linux' sysctl reference documentation</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul 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<ul><li><a href="/wiki/Soft_updates" title="Soft updates">soft updates</a></li></ul></li> <li><a href="/wiki/Vinum_volume_manager" title="Vinum volume manager">Vinum</a></li> <li><a href="/wiki/Virtual_file_system" title="Virtual file system">VFS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Firewall_(computing)" title="Firewall (computing)">Firewalls</a>, <a href="/wiki/Computer_network" title="Computer network">networking</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Comparison_of_open-source_wireless_drivers#DragonFly_BSD" title="Comparison of open-source wireless drivers">802.11 drivers</a></li> <li><a href="/wiki/ALTQ" title="ALTQ">ALTQ</a></li> <li><a href="/wiki/Bluetooth_stack#DragonFly_BSD" title="Bluetooth stack">Bluetooth</a></li> <li><a href="/wiki/Berkeley_Packet_Filter" title="Berkeley Packet Filter">BPF</a></li> <li><a href="/wiki/Common_Address_Redundancy_Protocol" title="Common Address Redundancy Protocol">CARP</a></li> <li><a href="/wiki/Ipfirewall" title="Ipfirewall">ipfw</a></li> <li><a href="/wiki/NDISwrapper#Similar_programs" title="NDISwrapper">NDIS</a></li> <li><a href="/wiki/Netgraph" title="Netgraph">netgraph</a></li> <li><a href="/wiki/PF_(firewall)" title="PF (firewall)">PF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Subsystems</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Busdma" title="Busdma">busdma</a></li> <li><a href="/wiki/DPorts" class="mw-redirect" title="DPorts">DPorts</a></li> <li><a href="/wiki/Ioctl" title="Ioctl">ioctl</a></li> <li><a href="/wiki/Kqueue" title="Kqueue">kqueue</a></li> <li><a href="/wiki/Moused" title="Moused">moused</a></li> <li><a href="/wiki/OpenPAM" title="OpenPAM">OpenPAM</a></li> <li><a class="mw-selflink selflink">sysctl</a> <ul><li><a href="/wiki/Hw.sensors" title="Hw.sensors">hw.sensors</a></li></ul></li> <li><a href="/wiki/Systat_(BSD)" title="Systat (BSD)">systat</a></li> <li><a href="/wiki/System_Management_Bus" title="System Management Bus">SMBus</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Matthew_Dillon" title="Matthew Dillon">Matthew Dillon</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="The_FreeBSD_Project" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:FreeBSD" title="Template:FreeBSD"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:FreeBSD" title="Template talk:FreeBSD"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:FreeBSD" title="Special:EditPage/Template:FreeBSD"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="The_FreeBSD_Project" style="font-size:114%;margin:0 4em">The <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a> Project</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/FreeBSD_Core_Team" title="FreeBSD Core Team">FreeBSD Core Team</a></li> <li><a href="/wiki/FreeBSD_Documentation_License" title="FreeBSD Documentation License">FreeBSD Documentation License</a></li> <li><a href="/wiki/FreeBSD_Foundation" title="FreeBSD Foundation">FreeBSD Foundation</a></li> <li><a href="/wiki/FreeBSD_Ports" title="FreeBSD Ports">FreeBSD Ports</a></li> <li><a href="/wiki/FreeBSD_version_history" title="FreeBSD version history">Version History</a></li> <li><a href="/wiki/Kernel_Normal_Form" title="Kernel Normal Form">Kernel Normal Form</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Subsystems</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Scheduling_(computing)#SCHEDULER" title="Scheduling (computing)">Scheduling</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ALTQ" title="ALTQ">ALTQ</a></li> <li><a href="/wiki/ULE_scheduler" title="ULE scheduler">ULE scheduler</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/OS-level_virtualisation" class="mw-redirect" title="OS-level virtualisation">Virtualisation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chroot" title="Chroot">chroot</a></li> <li><a href="/wiki/FreeBSD_jail" title="FreeBSD jail">jail</a></li> <li><a href="/wiki/Bhyve" title="Bhyve">bhyve</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Computer_data_storage" title="Computer data storage">Storage</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/GEOM" title="GEOM">GEOM</a> <ul><li><a href="/wiki/Geom_raid5" title="Geom raid5">raid5</a></li> <li><a href="/wiki/GBDE" title="GBDE">GBDE</a></li> <li><a href="/wiki/Geli_(software)" title="Geli (software)">geli</a></li> <li><a href="/wiki/Logical_Volume_Manager_(Linux)" title="Logical Volume Manager (Linux)">LVM2</a></li> <li><a href="/wiki/Vinum_volume_manager" title="Vinum volume manager">vinum</a></li></ul></li> <li><a href="/wiki/BSD_disklabel" title="BSD disklabel">disklabel</a> <ul><li><a href="/wiki/Fdisk" title="Fdisk">fdisk</a></li></ul></li> <li><a href="/wiki/Unix_File_System" title="Unix File System">UFS</a> <ul><li><a href="/wiki/Soft_updates" title="Soft updates">Soft updates</a></li></ul></li> <li><a href="/wiki/Virtual_file_system" title="Virtual file system">VFS</a></li> <li><a href="/wiki/OpenZFS#ZFS_on_FreeBSD" title="OpenZFS">ZFS</a></li> <li><a href="/wiki/Highly_Available_STorage" title="Highly Available STorage">Highly Available STorage</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Computer_network" title="Computer network">Networking</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Comparison_of_open-source_wireless_drivers#FreeBSD" title="Comparison of open-source wireless drivers">802.11 drivers</a></li> <li><a href="/wiki/ALTQ" title="ALTQ">ALTQ</a></li> <li><a href="/wiki/Bluetooth_stack#FreeBSD" title="Bluetooth stack">Bluetooth</a></li> <li><a href="/wiki/Berkeley_Packet_Filter" title="Berkeley Packet Filter">BPF</a></li> <li><a href="/wiki/IPFilter" title="IPFilter">IPFilter</a></li> <li><a href="/wiki/Ipfirewall" title="Ipfirewall">ipfw</a></li> <li><a href="/wiki/Netgraph" title="Netgraph">Netgraph</a></li> <li><a href="/wiki/NDISwrapper#Similar_programs" title="NDISwrapper">NDIS</a></li> <li><a href="/wiki/PF_(firewall)" title="PF (firewall)">pf</a> <ul><li><a href="/wiki/Common_Address_Redundancy_Protocol" title="Common Address Redundancy Protocol">CARP</a></li> <li><a href="/wiki/Pfsync" title="Pfsync">pfsync</a></li></ul></li> <li><a href="/wiki/Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Busdma" title="Busdma">busdma</a></li> <li><a href="/wiki/DTrace" title="DTrace">DTrace</a></li> <li><a href="/wiki/OpenPAM" title="OpenPAM">OpenPAM</a></li> <li><a href="/wiki/OpenBSM" title="OpenBSM">OpenBSM</a></li> <li><a href="/wiki/Portsnap" title="Portsnap">portsnap</a></li> <li><a href="/wiki/Kqueue" title="Kqueue">kqueue</a></li> <li><a href="/wiki/Loadable_kernel_module" title="Loadable kernel module">KLD</a></li> <li><a href="/wiki/Moused" title="Moused">moused</a></li> <li><a href="/wiki/Systat_(BSD)" title="Systat (BSD)">systat</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Matthew_Dillon" title="Matthew Dillon">Matthew Dillon</a></li> <li><a href="/wiki/Jordan_Hubbard" title="Jordan Hubbard">Jordan Hubbard</a></li> <li><a href="/wiki/Poul-Henning_Kamp" title="Poul-Henning Kamp">Poul-Henning Kamp</a></li> <li><a href="/wiki/Michael_J._Karels" title="Michael J. Karels">Mike Karels</a></li> <li><a href="/wiki/Ben_Laurie" title="Ben Laurie">Ben Laurie</a></li> <li><a href="/wiki/Samuel_J_Leffler" class="mw-redirect" title="Samuel J Leffler">Sam Leffler</a></li> <li><a href="/wiki/Marshall_Kirk_McKusick" title="Marshall Kirk McKusick">Marshall Kirk McKusick</a></li> <li><a href="/wiki/Diomidis_Spinellis" title="Diomidis Spinellis">Diomidis Spinellis</a></li> <li><a href="/wiki/Robert_Watson_(computer_scientist)" title="Robert Watson (computer scientist)">Robert Watson</a></li> <li><a href="/wiki/Dru_Lavigne" title="Dru Lavigne">Dru Lavigne</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_products_based_on_FreeBSD" title="List of products based on FreeBSD">Derivatives</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="open-source" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Open-source_software" title="Open-source software">open-source</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/XNU" title="XNU">XNU</a> <ul><li><a href="/wiki/Darwin_(operating_system)" title="Darwin (operating system)">Darwin</a></li></ul></li> <li><a href="/wiki/DesktopBSD" title="DesktopBSD">DesktopBSD</a></li> <li><a href="/wiki/DragonFly_BSD" title="DragonFly BSD">DragonFly BSD</a></li> <li><a href="/wiki/FreeNAS" class="mw-redirect" title="FreeNAS">FreeNAS</a></li> <li><a href="/wiki/FreeSBIE" title="FreeSBIE">FreeSBIE</a></li> <li><a href="/wiki/GhostBSD" title="GhostBSD">GhostBSD</a></li> <li><a href="/wiki/MidnightBSD" title="MidnightBSD">MidnightBSD</a></li> <li><a href="/wiki/M0n0wall" title="M0n0wall">m0n0wall</a> <ul><li><a href="/wiki/OPNsense" title="OPNsense">OPNsense</a></li> <li><a href="/wiki/PfSense" title="PfSense">pfSense</a></li></ul></li> <li><a href="/wiki/TrueOS" title="TrueOS">TrueOS</a></li> <li><a href="/wiki/GNU_variants#BSD_variants" title="GNU variants">GNU/kFreeBSD</a></li> <li><a href="/wiki/Gentoo/FreeBSD" class="mw-redirect" title="Gentoo/FreeBSD">Gentoo/FreeBSD</a></li> <li><a href="/wiki/XigmaNAS" title="XigmaNAS">XigmaNAS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Proprietary_software" title="Proprietary software">proprietary</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Junos" class="mw-redirect" title="Junos">Junos</a></li> <li><a href="/wiki/MacOS" title="MacOS">macOS</a>, <a href="/wiki/IOS" title="IOS">iOS</a>, <a href="/wiki/TvOS" title="TvOS">tvOS</a>, and <a href="/wiki/WatchOS" title="WatchOS">watchOS</a></li> <li><a href="/wiki/Nintendo_Switch_system_software" title="Nintendo Switch system software">Nintendo Switch OS</a></li> <li><a href="/wiki/OpenServer" title="OpenServer">OpenServer 10</a></li> <li><a href="/wiki/PlayStation_3_system_software" title="PlayStation 3 system software">PlayStation 3 OS</a></li> <li><a href="/wiki/PlayStation_4_system_software" title="PlayStation 4 system software">PlayStation 4 OS</a></li> <li><a href="/wiki/PlayStation_Vita_system_software" title="PlayStation Vita system software">PlayStation Vita OS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="The_NetBSD_Project" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:NetBSD" title="Template:NetBSD"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:NetBSD" title="Template talk:NetBSD"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:NetBSD" title="Special:EditPage/Template:NetBSD"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="The_NetBSD_Project" style="font-size:114%;margin:0 4em">The <a href="/wiki/NetBSD" title="NetBSD">NetBSD</a> Project</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Operating system</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NetBSD" title="NetBSD">NetBSD</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related projects</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pkgsrc" title="Pkgsrc">pkgsrc</a></li> <li>netpgp</li> <li><a href="/wiki/Portable_C_Compiler" title="Portable C Compiler">pcc</a></li> <li><a href="/wiki/Tnftp" title="Tnftp">tnftp</a></li> <li><a href="/wiki/Tcsh" title="Tcsh">tcsh</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Notable subsystems</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Veriexec" title="Veriexec">Veriexec</a></li> <li><a href="/wiki/Busdma" title="Busdma">busdma</a></li> <li><a href="/wiki/DTrace" title="DTrace">DTrace</a></li> <li><a href="/wiki/Envsys" title="Envsys">envsys</a></li> <li><a href="/wiki/Loadable_kernel_module" title="Loadable kernel module">LKM</a></li> <li><a href="/wiki/Rump_kernel" title="Rump kernel">Rump kernel</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/File_system" title="File system">File systems</a> and <a href="/wiki/Computer_data_storage" title="Computer data storage">storage</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bioctl" title="Bioctl">bioctl</a></li> <li><a href="/wiki/CHFS" title="CHFS">CHFS</a></li> <li><a href="/wiki/BSD_disklabel" title="BSD disklabel">disklabel</a> <ul><li><a href="/wiki/Fdisk" title="Fdisk">fdisk</a></li></ul></li> <li><a href="/wiki/Logical_Volume_Manager_(Linux)" title="Logical Volume Manager (Linux)">LVM2</a></li> <li><a href="/wiki/PUFFS_(NetBSD)" title="PUFFS (NetBSD)">PUFFS</a></li> <li><a href="/wiki/Tmpfs#BSD" title="Tmpfs">tmpfs</a></li> <li><a href="/wiki/Unix_File_System" title="Unix File System">UFS</a> <ul><li><a href="/wiki/Write_Ahead_Physical_Block_Logging" title="Write Ahead Physical Block Logging">WAPBL</a></li></ul></li> <li><a href="/wiki/OpenZFS" title="OpenZFS">OpenZFS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Firewall_(computing)" title="Firewall (computing)">Firewalls</a> and <a href="/wiki/Computer_network" title="Computer network">networking</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Comparison_of_open-source_wireless_drivers#NetBSD" title="Comparison of open-source wireless drivers">802.11 drivers</a></li> <li><a href="/wiki/ALTQ" title="ALTQ">ALTQ</a></li> <li><a href="/wiki/Bluetooth_stack#NetBSD" title="Bluetooth stack">Bluetooth</a></li> <li><a href="/wiki/Common_Address_Redundancy_Protocol" title="Common Address Redundancy Protocol">CARP</a></li> <li><a href="/wiki/Berkeley_Packet_Filter" title="Berkeley Packet Filter">BPF</a></li> <li><a href="/wiki/IPFilter" title="IPFilter">IPFilter</a></li> <li><a href="/wiki/NPF_(firewall)" title="NPF (firewall)">NPF</a></li> <li><a href="/wiki/PF_(firewall)" title="PF (firewall)">PF</a> <ul><li><a href="/wiki/Pfsync" title="Pfsync">pfsync</a></li></ul></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="The_OpenBSD_Project" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" 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