July 2011
Intermediate to advanced
104 pages
2h 14m
English
Content preview from Perl Pocket Reference, 5th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
%ENVContains the current environment. The key is the name of an environment variable; the value is its current setting.
%EXPORT_TAGSDefines names for sets of symbols. Used by the
Exportermodule.%INCContains 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.
%SIGRegisters signal handlers for various signals. The key is the name of the signal (without the
SIGprefix); 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.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.