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Perl predefined variables - Perldoc Browser
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The default input and pattern-searching space</p> </li> </ul> <ul> <li><p><a href="/5.6.1/variables/$%3Cdigits%3E"><b>$<<i>digits</i>></b></a> - Contains the subpattern from the corresponding set of capturing parentheses from the last pattern match, not counting patterns matched in nested blocks that have been exited already</p> </li> <li><p><a href="/5.6.1/variables/$&"><b>$&</b></a> - The string matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval() enclosed by the current BLOCK)</p> </li> <li><p><a href="/5.6.1/variables/$%60"><b>$`</b></a> - The string preceding whatever was matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval enclosed by the current BLOCK)</p> </li> <li><p><a href="/5.6.1/variables/$'"><b>$'</b></a> - The string following whatever was matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval() enclosed by the current BLOCK)</p> </li> <li><p><a href="/5.6.1/variables/$+"><b>$+</b></a> - The last bracket matched by the last search pattern</p> </li> <li><p><a href="/5.6.1/variables/@+"><b>@+</b></a> - This array holds the offsets of the ends of the last successful submatches in the currently active dynamic scope</p> </li> <li><p><a href="/5.6.1/variables/$*"><b>$*</b></a> - Set to a non-zero integer value to do multi-line matching within a string, 0 (or undefined) to tell Perl that it can assume that strings contain a single line, for the purpose of optimizing pattern matches</p> </li> <li><p><a href="/5.6.1/variables/$."><b>$.</b></a> - The current input record number for the last file handle from which you just read() (or called a <code>seek</code> or <code>tell</code> on)</p> </li> <li><p><a href="/5.6.1/variables/$%2F"><b>$/</b></a> - The input record separator, newline by default</p> </li> <li><p><a href="/5.6.1/variables/$%7C"><b>$|</b></a> - If set to nonzero, forces a flush right away and after every write or print on the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/$,"><b>$,</b></a> - The output field separator for the print operator</p> </li> <li><p><a href="/5.6.1/variables/$%5C"><b>$\</b></a> - The output record separator for the print operator</p> </li> <li><p><a href="/5.6.1/variables/$%22"><b>$"</b></a> - This is like <code>$,</code> except that it applies to array and slice values interpolated into a double-quoted string (or similar interpreted string)</p> </li> <li><p><a href="/5.6.1/variables/$;"><b>$;</b></a> - The subscript separator for multidimensional array emulation</p> </li> <li><p><a href="/5.6.1/variables/$%23"><b>$#</b></a> - The output format for printed numbers</p> </li> <li><p><a href="/5.6.1/variables/$%25"><b>$%</b></a> - The current page number of the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/$="><b>$=</b></a> - The current page length (printable lines) of the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/$-"><b>$-</b></a> - The number of lines left on the page of the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/@-"><b>@-</b></a> - $-[0] is the offset of the start of the last successful match</p> </li> <li><p><a href="/5.6.1/variables/$~"><b>$~</b></a> - The name of the current report format for the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/$%5E"><b>$^</b></a> - The name of the current top-of-page format for the currently selected output channel</p> </li> <li><p><a href="/5.6.1/variables/$:"><b>$:</b></a> - The current set of characters after which a string may be broken to fill continuation fields (starting with ^) in a format</p> </li> <li><p><a href="/5.6.1/variables/$%5EL"><b>$^L</b></a> - What formats output as a form feed</p> </li> <li><p><a href="/5.6.1/variables/$%5EA"><b>$^A</b></a> - The current value of the write() accumulator for format() lines</p> </li> <li><p><a href="/5.6.1/variables/$%3F"><b>$?</b></a> - The status returned by the last pipe close, backtick (<code>``</code>) command, successful call to wait() or waitpid(), or from the system() operator</p> </li> <li><p><a href="/5.6.1/variables/$!"><b>$!</b></a> - If used numerically, yields the current value of the C <code>errno</code> variable, with all the usual caveats</p> </li> <li><p><a href="/5.6.1/variables/$%5EE"><b>$^E</b></a> - Error information specific to the current operating system</p> </li> <li><p><a href="/5.6.1/variables/$@"><b>$@</b></a> - The Perl syntax error message from the last eval() operator</p> </li> <li><p><a href="/5.6.1/variables/$$"><b>$$</b></a> - The process number of the Perl running this script</p> </li> <li><p><a href="/5.6.1/variables/$%3C"><b>$<</b></a> - The real uid of this process</p> </li> <li><p><a href="/5.6.1/variables/$%3E"><b>$></b></a> - The effective uid of this process</p> </li> <li><p><a href="/5.6.1/variables/$("><b>$(</b></a> - The real gid of this process</p> </li> <li><p><a href="/5.6.1/variables/$)"><b>$)</b></a> - The effective gid of this process</p> </li> <li><p><a href="/5.6.1/variables/$0"><b>$0</b></a> - Contains the name of the program being executed</p> </li> <li><p><a href="/5.6.1/variables/$%5B"><b>$[</b></a> - The index of the first element in an array, and of the first character in a substring</p> </li> <li><p><a href="/5.6.1/variables/$%5D"><b>$]</b></a> - The version + patchlevel / 1000 of the Perl interpreter</p> </li> <li><p><a href="/5.6.1/variables/$%5EC"><b>$^C</b></a> - The current value of the flag associated with the <b>-c</b> switch</p> </li> <li><p><a href="/5.6.1/variables/$%5ED"><b>$^D</b></a> - The current value of the debugging flags</p> </li> <li><p><a href="/5.6.1/variables/$%5EF"><b>$^F</b></a> - The maximum system file descriptor, ordinarily 2. System file descriptors are passed to exec()ed processes, while higher file descriptors are not</p> </li> <li><p><a href="/5.6.1/variables/$%5EH"><b>$^H</b></a> - This variable contains compile-time hints for the Perl interpreter</p> </li> <li><p><a href="/5.6.1/variables/%25%5EH"><b>%^H</b></a> - The %^H hash provides the same scoping semantic as $^H. This makes it useful for implementation of lexically scoped pragmas</p> </li> <li><p><a href="/5.6.1/variables/$%5EI"><b>$^I</b></a> - The current value of the inplace-edit extension</p> </li> <li><p><a href="/5.6.1/variables/$%5EM"><b>$^M</b></a> - Perl can use the contents of <code>$^M</code> as an emergency memory pool after die()ing</p> </li> <li><p><a href="/5.6.1/variables/$%5EO"><b>$^O</b></a> - The name of the operating system under which this copy of Perl was built, as determined during the configuration process</p> </li> <li><p><a href="/5.6.1/variables/$%5EP"><b>$^P</b></a> - The internal variable for debugging support</p> </li> <li><p><a href="/5.6.1/variables/$%5ER"><b>$^R</b></a> - The result of evaluation of the last successful <code>(?{ code })</code> regular expression assertion (see <a href="/5.6.1/perlre">perlre</a>)</p> </li> <li><p><a href="/5.6.1/variables/$%5ES"><b>$^S</b></a> - Current state of the interpreter</p> </li> <li><p><a href="/5.6.1/variables/$%5ET"><b>$^T</b></a> - The time at which the program began running, in seconds since the epoch (beginning of 1970)</p> </li> <li><p><a href="/5.6.1/variables/$%5EV"><b>$^V</b></a> - The revision, version, and subversion of the Perl interpreter, represented as a string composed of characters with those ordinals</p> </li> <li><p><a href="/5.6.1/variables/$%5EW"><b>$^W</b></a> - The current value of the warning switch, initially true if <b>-w</b> was used, false otherwise, but directly modifiable</p> </li> <li><p><a href="/5.6.1/variables/$%7B%5EWARNING_BITS%7D"><b>${^WARNING_BITS}</b></a> - The current set of warning checks enabled by the <code>use warnings</code> pragma</p> </li> <li><p><a href="/5.6.1/variables/$%7B%5EWIDE_SYSTEM_CALLS%7D"><b>${^WIDE_SYSTEM_CALLS}</b></a> - Global flag that enables system calls made by Perl to use wide character APIs native to the system, if available</p> </li> <li><p><a href="/5.6.1/variables/$%5EX"><b>$^X</b></a> - The name that the Perl binary itself was executed as, from C's <code>argv[0]</code></p> </li> <li><p><a href="/5.6.1/variables/$ARGV"><b>$ARGV</b></a> - contains the name of the current file when reading from <></p> </li> <li><p><a href="/5.6.1/variables/@ARGV"><b>@ARGV</b></a> - The array @ARGV contains the command-line arguments intended for the script</p> </li> <li><p><a href="/5.6.1/variables/@INC"><b>@INC</b></a> - The array @INC contains the list of places that the <code>do EXPR</code>, <code>require</code>, or <code>use</code> constructs look for their library files</p> </li> <li><p><a href="/5.6.1/variables/@_"><b>@_</b></a> - Within a subroutine the array @_ contains the parameters passed to that subroutine</p> </li> <li><p><a href="/5.6.1/variables/%25INC"><b>%INC</b></a> - The hash %INC contains entries for each filename included via the <code>do</code>, <code>require</code>, or <code>use</code> operators</p> </li> <li><p><a href="/5.6.1/variables/$ENV%7Bexpr%7D"><b>$ENV{expr}</b></a> - The hash %ENV contains your current environment</p> </li> <li><p><a href="/5.6.1/variables/$SIG%7Bexpr%7D"><b>$SIG{expr}</b></a> - The hash %SIG contains signal handlers for signals</p> </li> </ul> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). 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