=pod I> =head2 General Variables =over 8 =item * B> - The default input and pattern-searching space =item * B> - Within a subroutine the array C contains the parameters passed to that subroutine =item * B> - When an array or an array slice is interpolated into a double-quoted string or a similar context such as C, its elements are separated by this value =item * B> - The process number of the Perl running this script =item * B> - Contains the name of the program being executed =item * B> - The real gid of this process =item * B> - The effective gid of this process =item * B> - The real uid of this process =item * B >> - The effective uid of this process =item * B> - The subscript separator for multidimensional array emulation =item * B>, B> - Special package variables when using C, see L =item * B> - The hash C contains your current environment =item * B> - The revision, version, and subversion of the Perl interpreter, represented as a decimal of the form 5.XXXYYY, where XXX is the version / 1e3 and YYY is the subversion / 1e6 =item * B> - The maximum system file descriptor, ordinarily 2. System file descriptors are passed to Ced processes, while higher file descriptors are not =item * B> - The array C contains the fields of each line read in when autosplit mode is turned on =item * B> - The array C contains the list of places that the C, C, or C constructs look for their library files =item * B> - The hash C contains entries for each filename included via the C, C, or C operators =item * B> - The current value of the inplace-edit extension =item * B> - Perl can use the contents of C as an emergency memory pool after Cing =item * B> - The name of the operating system under which this copy of Perl was built, as determined during the configuration process =item * B> - The hash C contains signal handlers for signals =item * B> - The time at which the program began running, in seconds since the epoch (beginning of 1970) =item * B> - The revision, version, and subversion of the Perl interpreter, represented as a L object =item * B> - If this variable is set to a true value, then C on Windows will not try to open the file =item * B> - The name used to execute the current copy of Perl, from C's C or (where supported) F =back =head2 Variables related to regular expressions =over 8 =item * B> ($1, $2, ...) >> - Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern match, not counting patterns matched in nested blocks that have been exited already =item * B> - The string matched by the last successful pattern match (not counting any matches hidden within a BLOCK or C enclosed by the current BLOCK) =item * B> - This is similar to C (C) except that it does not incur the performance penalty associated with that variable =item * B> - The string preceding whatever was matched by the last successful pattern match, not counting any matches hidden within a BLOCK or C enclosed by the current BLOCK =item * B> - This is similar to C ($PREMATCH) except that it does not incur the performance penalty associated with that variable =item * B> - The string following whatever was matched by the last successful pattern match (not counting any matches hidden within a BLOCK or C enclosed by the current BLOCK) =item * B> - This is similar to C (C) except that it does not incur the performance penalty associated with that variable =item * B> - The text matched by the last bracket of the last successful search pattern =item * B> - The text matched by the used group most-recently closed (i.e. the group with the rightmost closing parenthesis) of the last successful search pattern =item * B> - This array holds the offsets of the ends of the last successful submatches in the currently active dynamic scope =item * B> - Similar to C, the C hash allows access to the named capture buffers, should they exist, in the last successful match in the currently active dynamic scope =item * B> - C is the offset of the start of the last successful match =item * B> - Similar to C, this variable allows access to the named capture groups in the last successful match in the currently active dynamic scope =item * B> - The result of evaluation of the last successful C regular expression assertion (see L) =item * B> - The current value of the regex debugging flags =item * B> - Controls how certain regex optimisations are applied and how much memory they utilize =back =head2 Variables related to filehandles =over 8 =item * B> - Contains the name of the current file when reading from C >> =item * B> - The array C contains the command-line arguments intended for the script =item * B> - The special filehandle that iterates over command-line filenames in C =item * B> - The special filehandle that points to the currently open output file when doing edit-in-place processing with B =item * B> - The output field separator for the print operator =item * B> - Current line number for the last filehandle accessed =item * B> - The input record separator, newline by default =item * B> - The output record separator for the print operator =item * B> - If set to nonzero, forces a flush right away and after every write or print on the currently selected output channel =item * B> - This read-only variable contains a reference to the last-read filehandle =back =head3 Variables related to formats =over 8 =item * B> - The current value of the C accumulator for C lines =item * B> - What formats output as a form feed =item * B> - The current page number of the currently selected output channel =item * B> - The number of lines left on the page of the currently selected output channel =item * B> - The current set of characters after which a string may be broken to fill continuation fields (starting with C) in a format =item * B> - The current page length (printable lines) of the currently selected output channel =item * B> - The name of the current top-of-page format for the currently selected output channel =item * B> - The name of the current report format for the currently selected output channel =back =head2 Error Variables X X =over 8 =item * B> - The native status returned by the last pipe close, backtick (C) command, successful call to C or C, or from the C operator =item * B> - Error information specific to the current operating system =item * B> - Current state of the interpreter =item * B> - The current value of the warning switch, initially true if B was used, false otherwise, but directly modifiable =item * B> - The current set of warning checks enabled by the C pragma =item * B> - When referenced, C retrieves the current value of the C C integer variable =item * B> - Each element of C has a true value only if C is set to that value =item * B> - The status returned by the last pipe close, backtick (C) command, successful call to C or C, or from the C operator =item * B> - The Perl error from the last C operator, i.e. the last exception that was caught =back =head2 Variables related to the interpreter state =over 8 =item * B> - The current value of the flag associated with the B switch =item * B> - The current value of the debugging flags =item * B> - DEPRECATED!!! =item * B> - The current phase of the perl interpreter =item * B> - This variable contains compile-time hints for the Perl interpreter =item * B> - The C hash provides the same scoping semantic as C =item * B> - An internal variable used by PerlIO =item * B> - The internal variable for debugging support =item * B> - Reflects if taint mode is on or off =item * B> - Reflects certain Unicode settings of Perl =item * B> - This variable controls the state of the internal UTF-8 offset caching code =item * B> - This variable indicates whether a UTF-8 locale was detected by perl at startup =back =head2 Deprecated and removed variables =over 8 =item * B> - C was a variable that could be used to format printed numbers =item * B> - C was a variable that you could use to enable multiline matching =item * B> - This variable stores the index of the first element in an array, and of the first character in a substring =back