This ‘cheat sheet’ is a handy reference, meant for beginning Perl programmers. Not everything is mentioned, but 195 features may already be overwhelming.<\/p>\n
Perl 5 cheat sheet v8\r\n\r\n CONTEXTS SIGILS ARRAYS HASHES\r\n void $scalar whole: @array %hash\r\n scalar @array slice: @array[0, 2] @hash{'a', 'b'}\r\n list %hash element: $array[0] $hash{'a'}\r\n &sub\r\n *glob SCALAR VALUES\r\n number, string, reference, glob, undef\r\n REFERENCES\r\n \\ references $$foo[1] aka $foo->[1]\r\n $@%&* dereference $$foo{bar} aka $foo->{bar}\r\n [] anon. arrayref ${$$foo[1]}[2] aka $foo->[1]->[2]\r\n {} anon. hashref ${$$foo[1]}[2] aka $foo->[1][2]\r\n \\() list of refs\r\n NUMBERS vs STRINGS LINKS\r\n OPERATOR PRECEDENCE = = perl.plover.com\r\n -> + . search.cpan.org\r\n ++ -- == != eq ne cpan.org\r\n ** < > <= >= lt gt le ge pm.org\r\n ! ~ \\ u+ u- <=> cmp tpj.com\r\n =~ !~ perldoc.com\r\n * \/ % x SYNTAX\r\n + - . for (LIST) { }, for (a;b;c) { }\r\n << >> while ( ) { }, until ( ) { }\r\n named uops if ( ) { } elsif ( ) { } else { }\r\n < > <= >= lt gt le ge unless ( ) { } elsif ( ) { } else { }\r\n == != <=> eq ne cmp for equals foreach (ALWAYS)\r\n &\r\n\r\n | ^ REGEX METACHARS REGEX MODIFIERS\r\n && ^ string begin \/i case insens.\r\n || $ str. end (before \\n) \/m line based ^$\r\n .. ... + one or more \/s . includes \\n\r\n ?: * zero or more \/x ign. wh.space\r\n = += -= *= etc. ? zero or one \/g global\r\n , => {3,7} repeat in range\r\n list ops () capture REGEX CHARCLASSES\r\n not (?:) no capture . == [^\\n]\r\n and [] character class \\s == [\\x20\\f\\t\\r\\n]\r\n or xor | alternation \\w == [A-Za-z0-9_]\r\n \\b word boundary \\d == [0-9] \r\n \\z string end \\S, \\W and \\D negate\r\n DO\r\n use strict; DON'T LINKS\r\n use warnings; \"$foo\" perl.com \r\n my $var; $$variable_name perlmonks.org \r\n open() or die $!; `$userinput` use.perl.org \r\n use Modules; \/$userinput\/ perl.apache.org\r\n parrotcode.org \r\n FUNCTION RETURN LISTS\r\n stat localtime caller SPECIAL VARIABLES\r\n 0 dev 0 second 0 package $_ default variable\r\n 1 ino 1 minute 1 filename $0 program name\r\n 2 mode 2 hour 2 line $\/ input separator\r\n 3 nlink 3 day 3 subroutine $\\ output separator\r\n 4 uid 4 month-1 4 hasargs $| autoflush\r\n 5 gid 5 year-1900 5 wantarray $! sys\/libcall error\r\n 6 rdev 6 weekday 6 evaltext $@ eval error\r\n 7 size 7 yearday 7 is_require $$ process ID\r\n 8 atime 8 is_dst 8 hints $. line number\r\n 9 mtime 9 bitmask @ARGV command line args\r\n 10 ctime just use @INC include paths\r\n 11 blksz POSIX:: 3..9 only @_ subroutine args\r\n 12 blcks strftime! with EXPR %ENV environment\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"This ‘cheat sheet’ is a handy reference, meant for beginning Perl programmers. Not everything is mentioned, but 195 features may already be overwhelming. Perl 5 cheat sheet v8 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’} &sub *glob SCALAR VALUES number, string, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-1040","post","type-post","status-publish","format-standard","hentry","category-perl-mamp"],"_links":{"self":[{"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/posts\/1040","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/comments?post=1040"}],"version-history":[{"count":2,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/posts\/1040\/revisions"}],"predecessor-version":[{"id":1042,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/posts\/1040\/revisions\/1042"}],"wp:attachment":[{"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/media?parent=1040"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/categories?post=1040"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.phpmind.com\/blog\/wp-json\/wp\/v2\/tags?post=1040"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}