Perl Pocket Reference, 4th Edition

Chapter 38. Special Hashes

%!

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

%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 pseudo-signals to attach handlers to Perl warnings and exceptions.

perlvar.