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.TH PERLCHEAT 1 "2006-01-07" "perl v5.8.8" "Perl Programmers Reference Guide"
perlcheat \- Perl 5 Cheat Sheet
This 'cheat sheet' is a handy reference, meant for beginning Perl
programmers. Not everything is mentioned, but 194 features may
.IX Subsection "The sheet"
\& CONTEXTS SIGILS ARRAYS HASHES
\& void $scalar whole: @array %hash
\& scalar @array slice: @array[0, 2] @hash{'a', 'b'}
\& list %hash element: $array[0] $hash{'a'}
\& number, string, reference, glob, undef
\& \e references $$foo[1] aka $foo->[1]
\& $@%&* dereference $$foo{bar} aka $foo->{bar}
\& [] anon. arrayref ${$$foo[1]}[2] aka $foo->[1]->[2]
\& {} anon. hashref ${$$foo[1]}[2] aka $foo->[1][2]
\& NUMBERS vs STRINGS LINKS
\& OPERATOR PRECEDENCE = = perl.plover.com
\& -> + . search.cpan.org
\& ++ -- == != eq ne cpan.org
\& ** < > <= >= lt gt le ge pm.org
\& ! ~ \e u+ u- <=> cmp tpj.com
\& + - . for (LIST) { }, for (a;b;c) { }
\& << >> while ( ) { }, until ( ) { }
\& named uops if ( ) { } elsif ( ) { } else { }
\& < > <= >= lt gt le ge unless ( ) { } elsif ( ) { } else { }
\& == != <=> eq ne cmp for equals foreach (ALWAYS)
\& | ^ REGEX METACHARS REGEX MODIFIERS
\& && ^ string begin /i case insens.
\& || $ str. end (before \en) /m line based ^$
\& .. ... + one or more /s . includes \en
\& ?: * zero or more /x ign. wh.space
\& = += -= *= etc. ? zero or one /g global
\& , => {3,7} repeat in range
\& list ops () capture REGEX CHARCLASSES
\& not (?:) no capture . == [^\en]
\& and [] character class \es == [\ex20\ef\et\er\en]
\& or xor | alternation \ew == [A-Za-z0-9_]
\& \eb word boundary \ed == [0-9]
\& \ez string end \eS, \eW and \eD negate
\& use strict; DON'T LINKS
\& use warnings; "$foo" perl.com
\& my $var; $$variable_name perlmonks.org
\& open() or die $!; `$userinput` use.perl.org
\& use Modules; /$userinput/ perl.apache.org
\& stat localtime caller SPECIAL VARIABLES
\& 0 dev 0 second 0 package $_ default variable
\& 1 ino 1 minute 1 filename $0 program name
\& 2 mode 2 hour 2 line $/ input separator
\& 3 nlink 3 day 3 subroutine $\e output separator
\& 4 uid 4 month-1 4 hasargs $| autoflush
\& 5 gid 5 year-1900 5 wantarray $! sys/libcall error
\& 6 rdev 6 weekday 6 evaltext $@ eval error
\& 7 size 7 yearday 7 is_require $$ process ID
\& 8 atime 8 is_dst 8 hints $. line number
\& 9 mtime 9 bitmask @ARGV command line args
\& 10 ctime just use @INC include paths
\& 11 blksz POSIX:: 3..9 only @_ subroutine args
\& 12 blcks strftime! with EXPR %ENV environment
.IX Header "ACKNOWLEDGEMENTS"
The first version of this document appeared on Perl Monks, where several
people had useful suggestions. Thank you, Perl Monks.
A special thanks to Damian Conway, who didn't only suggest important changes,
but also took the time to count the number of listed features and make a
Perl 6 version to show that Perl will stay Perl.
Juerd Waalboer <juerd@cpan.org>, with the help of many Perl Monks.
\& http://perlmonks.org/?node_id=216602 the original PM post
\& http://perlmonks.org/?node_id=238031 Damian Conway's Perl 6 version
\& http://juerd.nl/site.plp/perlcheat home of the Perl Cheat Sheet
projects / OpenSPARC-T2-SAM / blob