Perl Pocket Reference, 5th Edition

Special Hashes

%!

Each element of %! has a nonzero value only if $! is set to that value.

%+

Contains the named subpatterns with defined values from the last pattern successfully matched.

%-

Contains all named subpatterns from the last pattern successfully matched.

%ENV

Contains the current environment. The key is the name of an environment variable; the value is its current setting.

%EXPORT_TAGS

Defines names for sets of symbols. Used by the Exporter module.

%INC

Contains the list of files that have been included with use, require, or do. The key is the filename as specified with the command; the value is the location of the file.

%SIG

Registers signal handlers for various signals. The key is the name of the signal (without the SIG prefix); the value a subroutine that is executed when the signal occurs.

__WARN__ and __DIE__ are pseudosignals to attach handlers to Perl warnings and exceptions.

perlvar.