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method="get" action="/5.8.4/search"> <input class="form-control mr-3" type="search" name="q" placeholder="Search" aria-label="Search" value=""> </form> </div> </nav> <div id="wrapperlicious" class="container-fluid"> <div id="perldocdiv"> <div id="links"> <a href="/5.8.4/functions">functions</a> / <a href="/5.8.4/functions/endprotoent">endprotoent</a> <div id="more"> (<a href="/5.8.4/functions/endprotoent.txt">source</a>, <a href="https://metacpan.org/pod/perlfunc#getpwnam-NAME">CPAN</a>) </div> </div> <div class="leading-notice"> You are viewing the version of this documentation from Perl 5.8.4. <a href="/functions/endprotoent">View the latest version</a> </div> <dl> <dt id="getpwnam-NAME"><a class="permalink" href="#getpwnam-NAME">#</a><a id="getpwnam"></a>getpwnam NAME</dt> <dd> </dd> <dt id="getgrnam-NAME"><a class="permalink" href="#getgrnam-NAME">#</a><a id="getgrnam"></a>getgrnam NAME</dt> <dd> </dd> <dt id="gethostbyname-NAME"><a class="permalink" href="#gethostbyname-NAME">#</a><a id="gethostbyname"></a>gethostbyname NAME</dt> <dd> </dd> <dt id="getnetbyname-NAME"><a class="permalink" href="#getnetbyname-NAME">#</a><a id="getnetbyname"></a>getnetbyname NAME</dt> <dd> </dd> <dt id="getprotobyname-NAME"><a class="permalink" href="#getprotobyname-NAME">#</a><a id="getprotobyname"></a>getprotobyname NAME</dt> <dd> </dd> <dt id="getpwuid-UID"><a class="permalink" href="#getpwuid-UID">#</a><a id="getpwuid"></a>getpwuid UID</dt> <dd> </dd> <dt id="getgrgid-GID"><a class="permalink" href="#getgrgid-GID">#</a><a id="getgrgid"></a>getgrgid GID</dt> <dd> </dd> <dt id="getservbyname-NAME,PROTO"><a class="permalink" href="#getservbyname-NAME,PROTO">#</a><a id="getservbyname"></a><a id="getservbyname-NAME-PROTO"></a>getservbyname NAME,PROTO</dt> <dd> </dd> <dt id="gethostbyaddr-ADDR,ADDRTYPE"><a class="permalink" href="#gethostbyaddr-ADDR,ADDRTYPE">#</a><a id="gethostbyaddr"></a><a id="gethostbyaddr-ADDR-ADDRTYPE"></a>gethostbyaddr ADDR,ADDRTYPE</dt> <dd> </dd> <dt id="getnetbyaddr-ADDR,ADDRTYPE"><a class="permalink" href="#getnetbyaddr-ADDR,ADDRTYPE">#</a><a id="getnetbyaddr"></a><a id="getnetbyaddr-ADDR-ADDRTYPE"></a>getnetbyaddr ADDR,ADDRTYPE</dt> <dd> </dd> <dt id="getprotobynumber-NUMBER"><a class="permalink" href="#getprotobynumber-NUMBER">#</a><a id="getprotobynumber"></a>getprotobynumber NUMBER</dt> <dd> </dd> <dt id="getservbyport-PORT,PROTO"><a class="permalink" href="#getservbyport-PORT,PROTO">#</a><a id="getservbyport"></a><a id="getservbyport-PORT-PROTO"></a>getservbyport PORT,PROTO</dt> <dd> </dd> <dt id="getpwent"><a class="permalink" href="#getpwent">#</a>getpwent</dt> <dd> </dd> <dt id="getgrent"><a class="permalink" href="#getgrent">#</a>getgrent</dt> <dd> </dd> <dt id="gethostent"><a class="permalink" href="#gethostent">#</a>gethostent</dt> <dd> </dd> <dt id="getnetent"><a class="permalink" href="#getnetent">#</a>getnetent</dt> <dd> </dd> <dt id="getprotoent"><a class="permalink" href="#getprotoent">#</a>getprotoent</dt> <dd> </dd> <dt id="getservent"><a class="permalink" href="#getservent">#</a>getservent</dt> <dd> </dd> <dt id="setpwent"><a class="permalink" href="#setpwent">#</a>setpwent</dt> <dd> </dd> <dt id="setgrent"><a class="permalink" href="#setgrent">#</a>setgrent</dt> <dd> </dd> <dt id="sethostent-STAYOPEN"><a class="permalink" href="#sethostent-STAYOPEN">#</a><a id="sethostent"></a>sethostent STAYOPEN</dt> <dd> </dd> <dt id="setnetent-STAYOPEN"><a class="permalink" href="#setnetent-STAYOPEN">#</a><a id="setnetent"></a>setnetent STAYOPEN</dt> <dd> </dd> <dt id="setprotoent-STAYOPEN"><a class="permalink" href="#setprotoent-STAYOPEN">#</a><a id="setprotoent"></a>setprotoent STAYOPEN</dt> <dd> </dd> <dt id="setservent-STAYOPEN"><a class="permalink" href="#setservent-STAYOPEN">#</a><a id="setservent"></a>setservent STAYOPEN</dt> <dd> </dd> <dt id="endpwent"><a class="permalink" href="#endpwent">#</a>endpwent</dt> <dd> </dd> <dt id="endgrent"><a class="permalink" href="#endgrent">#</a>endgrent</dt> <dd> </dd> <dt id="endhostent"><a class="permalink" href="#endhostent">#</a>endhostent</dt> <dd> </dd> <dt id="endnetent"><a class="permalink" href="#endnetent">#</a>endnetent</dt> <dd> </dd> <dt id="endprotoent"><a class="permalink" href="#endprotoent">#</a>endprotoent</dt> <dd> </dd> <dt id="endservent"><a class="permalink" href="#endservent">#</a>endservent</dt> <dd> <p>These routines perform the same functions as their counterparts in the system library. In list context, the return values from the various get routines are as follows:</p> <pre><code>($name,$passwd,$uid,$gid, $quota,$comment,$gcos,$dir,$shell,$expire) = getpw* ($name,$passwd,$gid,$members) = getgr* ($name,$aliases,$addrtype,$length,@addrs) = gethost* ($name,$aliases,$addrtype,$net) = getnet* ($name,$aliases,$proto) = getproto* ($name,$aliases,$port,$proto) = getserv*</code></pre> <p>(If the entry doesn't exist you get a null list.)</p> <p>The exact meaning of the $gcos field varies but it usually contains the real name of the user (as opposed to the login name) and other information pertaining to the user. Beware, however, that in many system users are able to change this information and therefore it cannot be trusted and therefore the $gcos is tainted (see <a href="/5.8.4/perlsec">perlsec</a>). The $passwd and $shell, user's encrypted password and login shell, are also tainted, because of the same reason.</p> <p>In scalar context, you get the name, unless the function was a lookup by name, in which case you get the other thing, whatever it is. (If the entry doesn't exist you get the undefined value.) For example:</p> <pre><code>$uid = getpwnam($name); $name = getpwuid($num); $name = getpwent(); $gid = getgrnam($name); $name = getgrgid($num); $name = getgrent(); #etc.</code></pre> <p>In <i>getpw*()</i> the fields $quota, $comment, and $expire are special cases in the sense that in many systems they are unsupported. If the $quota is unsupported, it is an empty scalar. If it is supported, it usually encodes the disk quota. If the $comment field is unsupported, it is an empty scalar. If it is supported it usually encodes some administrative comment about the user. In some systems the $quota field may be $change or $age, fields that have to do with password aging. In some systems the $comment field may be $class. The $expire field, if present, encodes the expiration period of the account or the password. For the availability and the exact meaning of these fields in your system, please consult your getpwnam(3) documentation and your <i>pwd.h</i> file. You can also find out from within Perl what your $quota and $comment fields mean and whether you have the $expire field by using the <code>Config</code> module and the values <code>d_pwquota</code>, <code>d_pwage</code>, <code>d_pwchange</code>, <code>d_pwcomment</code>, and <code>d_pwexpire</code>. Shadow password files are only supported if your vendor has implemented them in the intuitive fashion that calling the regular C library routines gets the shadow versions if you're running under privilege or if there exists the shadow(3) functions as found in System V ( this includes Solaris and Linux.) Those systems which implement a proprietary shadow password facility are unlikely to be supported.</p> <p>The $members value returned by <i>getgr*()</i> is a space separated list of the login names of the members of the group.</p> <p>For the <i>gethost*()</i> functions, if the <code>h_errno</code> variable is supported in C, it will be returned to you via <code>$?</code> if the function call fails. The <code>@addrs</code> value returned by a successful call is a list of the raw addresses returned by the corresponding system library call. In the Internet domain, each address is four bytes long and you can unpack it by saying something like:</p> <pre><code>($a,$b,$c,$d) = unpack('C4',$addr[0]);</code></pre> <p>The Socket library makes this slightly easier:</p> <pre><code>use Socket; $iaddr = inet_aton("127.1"); # or whatever address $name = gethostbyaddr($iaddr, AF_INET); # or going the other way $straddr = inet_ntoa($iaddr);</code></pre> <p>If you get tired of remembering which element of the return list contains which return value, by-name interfaces are provided in standard modules: <code>File::stat</code>, <code>Net::hostent</code>, <code>Net::netent</code>, <code>Net::protoent</code>, <code>Net::servent</code>, <code>Time::gmtime</code>, <code>Time::localtime</code>, and <code>User::grent</code>. These override the normal built-ins, supplying versions that return objects with the appropriate names for each field. For example:</p> <pre><code>use File::stat; use User::pwent; $is_his = (stat($filename)->uid == pwent($whoever)->uid);</code></pre> <p>Even though it looks like they're the same method calls (uid), they aren't, because a <code>File::stat</code> object is different from a <code>User::pwent</code> object.</p> </dd> </dl> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>