1: Perl 5 cheat sheet v6 by Juerd Waalboer, http://juerd.nl/ 2: . 3: CONTEXTS SIGILS ARRAYS HASHES 4: void $scalar @array %hash 5: scalar @array @array[0, 2] @hash{'a', 'b'} 6: list %hash $array[0] $hash{'a'} 7: &sub 8: *glob SCALAR VALUES 9: number, string, reference, glob, undef 10: REFERENCES 11: \ references $$foo[1] aka $foo->[1] 12: $@%&* dereference $$foo{bar} aka $foo->{bar} 13: [] anon. arrayref ${$$foo[1]}[2] aka $foo->[1]->[2] 14: {} anon. hashref ${$$foo[1]}[2] aka $foo->[1][2] 15: \() list of refs 16: NUMBERS vs STRINGS LINKS 17: OPERATOR PRECEDENCE = = perl.plover.com 18: -> + . search.cpan.org 19: ++ -- == != eq ne cpan.org 20: ** < > <= >= lt gt le ge pm.org 21: ! ~ \ u+ u- <=> cmp tpj.com 22: =~ !~ perldoc.com 23: * / % x SYNTAX 24: + - . for (LIST) { }, for (a;b;c) { } 25: << >> while ( ) { }, until ( ) { } 26: named uops if ( ) { } elsif ( ) { } else { } 27: < > <= >= lt gt le ge unless ( ) { } elsif ( ) { } else { } 28: == != <=> eq ne cmp for equals foreach (ALWAYS) 29: & 30: | ^ REGEX METACHARS REGEX MODIFIERS 31: && ^ string begin /i case insensitive 32: || $ string end (before \n) /m line based ^$ 33: .. ... + one or more /s dot includes \n 34: ?: * any amount /x ignore wh.space 35: = += -= *= etc. ? zero or one /g global 36: , => () capture 37: list ops (?:) no capture REGEX CHARCLASSES 38: not [] character class . == [^\n] 39: and | alternation \s == [\x20\f\t\r\n] 40: or xor {1,2} amount \w == [A-Za-z0-9_] 41: \b word boundary \d == [0-9] 42: \z string end \S, \W and \D negate 43: ALWAYS 44: use strict; NEVER unless pro LINKS 45: use warnings; "$foo" perl.com 46: my $var; $foo = "bar"; $$foo perlmonks.org 47: open() or die $!; `$userinput` use.perl.org 48: use Modules; /$userinput/ perl.apache.org 49: 50: 51: This is my christmas gift for all Perl newbies out there :) 52: Have fun! 53: 54: v1: initial version 55: v2: fixed per merlyn's suggestions 56: v3: added missing dollar signs 57: v4: changed per TheDamian's suggestions 58: v5: changed per TheDamian's suggestions 59: 60: 61: Note: It's hard to maintain two copies, so if you want 62: the most recent version, visit my homepage. Sorry! 63: 64: Update: If you have Perl 5.8.1 or later installed, try this 65: on a command line: 66: 67: perldoc perlcheat # :)
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