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perlcheat Cheat Sheet
by Nikolay Mishin (mishin) via cheatography.com/1008/cs/396/
About Perlcheat
AUTHOR Juerd Waalboer, with the
help of many Perl Monks.
the original PM
post
http:/ /pe rlm onk s.o rg/ ?
no de_ id= 216602
Damian
Conway's Perl 6
version
http:/ /pe rlm onk s.o rg/ ?
no de_ id= 238031
home of the Perl
Cheat Sheet
http:/ /ju erd.nl /si te.p lp /pe rlche
at
CONTEXTS
void
scalar
list
SIGILS
$scalar
@array
%hash
&sub
*glob
ARRAYS ,HASHES
 ARRAYS HASHES
whole: @array %hash
slice: @array[0, 2] @hash{'a', 'b'}
element: $array[0] $hash{'a'}
 
SCALAR VALUES
number, string, reference, glob, undef
SYNTAX
for (LIST) { }, for (a;b;c) { }
while ( ) { }, until ( ) { }
if ( ) { } elsif ( ) { } else { }
unless ( ) { } elsif ( ) { } else { }
for equals foreach (ALWAYS)
LINKS
Search the CPAN - metacp an.org https: //m et
a cpa n.org
Perl Weekly http:/ /pe rlw 
eek ly.c om /‐
la tes t.html
Perl Monks - The Monastery
Gates
http:/ /ww w
.p erl mon k
s.org/
What's happening in the world of
Perl progra mming, including Perl
5, Perl 6, the CPAN and Parrot?
http:/ /pe rlb 
uzz.com/
The Compre hensive Perl Archive
Network - www.cp an.org
http:/ /cp an.
org
News and views of the Perl
progra mming language
http:/ /ww w
.p erl.com/
Perl progra mming docume ntation
- perldo c.p erl.org
http:/ /pe rld 
oc.p er l.org‐
/
 
LINKS (cont)
Perl Confer ences,
YAPCs,
Workshops, and
Hackathons
http:/ /ww w.y apc.org/
Perl 6 http:/ /pe rl6.org/
Perl 6 Tablet 2 -
Basic Syntax
http:/ /ta ble ts.p er l6.o rg /ta bl
e t-2 -ba sic -sy nta x.html
Learn Perl -
learn.p er l.org
http:/ /le arn.pe rl.org/
Perl - Download http:/ /ww w.p erl.or g/g et.ht
ml
The Perl.org Online
Library
http:/ /ww w.p erl.or g/b ook s
/l ibr ary.html
Books and More
(Videos)
http:/ /ww w.p erl.or g/m edi a
.html
Padre, the Perl IDE http:/ /pa dre.pe rli de.org/
perlcheat http:/ /pe rld oc.p er l.o rg/ per l
ch eat.html
Gabor Szabo Perl
Trainer and
develo per
http:/ /sz abg ab.com/
Perl,Perl
Monger s,M ong ers ,U
ser Group, Meeting
http:/ /pm.org
Facebook vs
Google+ for Perl
projects
http:/ /sz abg ab.c om /fa ceb o
ok -vs -go ogl e-p lus -fo r-
p erl -pr oje cts.html
By Nikolay Mishin (mishin)
cheatography.com/mishin/
mishin.narod.ru
 
Published 1st June, 2012.
Last updated 5th June, 2014.
Page 1 of 5.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
perlcheat Cheat Sheet
by Nikolay Mishin (mishin) via cheatography.com/1008/cs/396/
LINKS (cont)
Lections about Per
from Gabor Szabo
http:/ /ww w.y out ube.co m/
r esu lts ?
se arc h_q uer y=g abo r+pe
rl
mod_perl world http:/ /pe rl.a pa che.org
Interp reted
Languages: PHP,
Perl, Python, Ruby
(Sheet One)
http:/ /hy per pol ygl ot.o rg /s
c ripting
Moose - A
postmodern object
system for Perl
http:/ /mo ose.ii nte rac tiv e.
com/
Perl Training
Australia - Perl Tips
http:/ /pe rlt rai nin g.c om.a u
/ tips/
Basic Perl (Ynon
Perek | An Amazing
Learning
Experi ence) , super
http:/ /yn onp ere k.c om/ cou 
rse s/b asi c-p erl.html
Perl Questions -
Stack Overflow
http:/ /st ack ove rfl ow.c om /
qu est ion s/t agg ed/ per l?
s ort =fa q& pag esi ze=15
Perl - Cheat sheets
Collection
http:/ /pe rl4 eve ryt hin g.b lo
g spo t.c om/ 201 0/1 2/p erl -
ch eat -sh eet s-
c oll ect ion.html
comp lete, working
examples of good
Perl code
http:/ /pe rlm eme.or g/s tar t
_h ere /in dex.html
 
LINKS (cont)
Perl
Progra mming
Tutorials
http:/ /ww w.d evs hed.co m/c /b/ Pe
rl/
Video from
UniverTV
http:/ /un ive rtv.ru /se arc h/? txt =pe 
rl&x= 0&y=0
FAQ по perl и
програ мми ро
ванию для
web
http:/ /ww w.c ybe rgu ru.r u/ web /w
e b-p rog ram min g/p erl -we b-
p rog ram min g-f aq- pag e2.html
FAQ PERL
Agava
http:/ /ho sti ng.a ga va.r u/ faq /te ch/ d
oc s/p erl.shtml
Modern ::Perl
Modern ::Perl
enable all of the features of Modern Perl with
one import
Toolkit
use Toolkit; and put all your favorite modules
in a file: > cat
$PERL5 LIB /To olk it/ Mac ros /AL WAY S/M odules
use strict; use warnings; use Carp; use
Smart: :Co mments;
 
Modern ::Perl (cont)
use common ::s ense;
supposed to be the same, with much lower
memory usage, as: # # use strict qw(vars
subs); # use feature qw(say state switch); #
no warnings; # use warnings qw(FATAL
closed threads internal debugging pack
substr malloc # unopened portable
prototype inplace io pipe unpack regexp #
deprecated exiting glob digit printf utf8 layer
# reserved parent hesis taint closure
semico lon); # no warnings qw(exec
newline);
latest
There is latest, which is no longer the latest.
Demons trates part of the naming problem.
uni::perl
Also, uni::perl which adds enabling unicode
part of the mix.
ToolSet
ToolSet offers a subset of Toolkit's abilities,
but without source filters.
Moose
I'll include Moose here, since it
automa tically adds strict and warnings to
the calling package.
Acme:: Ver y:: Mod ern ::Perl
Using this module, you'll get Modern ::Perl,
Toolkit, latest, uni::perl, perl5i, and
common ::sense with just one simple line.
By Nikolay Mishin (mishin)
cheatography.com/mishin/
mishin.narod.ru
 
Published 1st June, 2012.
Last updated 5th June, 2014.
Page 2 of 5.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
perlcheat Cheat Sheet
by Nikolay Mishin (mishin) via cheatography.com/1008/cs/396/
Modern ::Perl (cont)
Source
http:/ /st ack ove rfl ow.c om /qu est ion s/1 625 839 /sh 
oul d-i -us e-c omm ons ens e-o r-j ust -st ick -
wi th- use -st ric t-a nd- use -wa rnings
REGEX METACHARS
^ string begin
$ str. end (before \n)
+ one or more
* zero or more
? zero or one
{3,7} repeat in range
() capture
(?:) no capture
[] character class
| altern ation
\b word boundary
\z string end
http:/ /pe rld oc.p er l.o rg/ per lre.html
Perl image
REGEX CHARCL ASSES
. [^\n]
\s [\x20 \f\t \r\n]
\w [A-Za- z0-9_]
\d [0-9]
\S, \W and \D negate
 
REGEX MODIFIERS
/i case insens.
/m line based ^$
/s . includes \n
/x ign. wh.space
/g global
\Q quote (disable) pattern metach ara cters till
\E
\E end either case modifi cation or quoted
section, think vi
FUNCTION RETURN LISTS
stat localtime caller
0 dev 0 second 0 package
1 ino 1 minute 1 filename
2 mode 2 hour 2 line
3 nlink 3 day 3 subroutine
4 uid 4 month-1 4 hasargs
5 gid 5 year-1900 5 wantarray
6 rdev 6 weekday 6 evaltext
7 size 7 yearday 7 is_require
8 atime 8 is_dst 8 hints
 
FUNCTION RETURN LISTS (cont)
9
mtime
 9
bitmask
10
ctime
just use
11
blksz
POSIX:: 3..9
only
12
blcks
strftime!
http:/ /do cst ore.mi k.u a/o rel ly/ p
er l/p rog 3/c h32 _36.htm
with
EXPR
opendir & grep:
opendi r(D IR, " $SC AND ATA ");
@files = sort(g rep (/[ 0-9 ]\.[0 -
9] \- /,r ead dir (DI R)));
closed ir( DIR);
hash iteration:
while (($key ,$val) = each (%hash)) { }
getopt
use Getopt ::Std;
%optio ns=();
getopt s("h e:f :s: SD: u:F :", \%op tions);
if ($opti ons{h}) { &u sage(); }
http:/ /ww w.p erl how to.c om /pa rsi ng_ com man d_l in
e _pa ram ete rs_ wit h_g eto pt_long
http:/ /ww w.p erl mon ks.o rg /?n ode _id =455158
http:/ /ap law ren ce.c om /Un ix/ per lge top ts.html
http:/ /ww w.c s.m cgi ll.c a/ ~ab atk o/c omp ute rs/ pro gr
a mmi ng/ per l/h owt o/g etopts/
http:/ /pe rl.f in d-i nfo.ru /pe rl/ 015 /in ter fac e/1.htm
By Nikolay Mishin (mishin)
cheatography.com/mishin/
mishin.narod.ru
 
Published 1st June, 2012.
Last updated 5th June, 2014.
Page 3 of 5.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
perlcheat Cheat Sheet
by Nikolay Mishin (mishin) via cheatography.com/1008/cs/396/
Perl IDE
source http:/ /ww w.p erl ide.org/
Padre http:/ /pa dre.pe rli de.org/ The Perl
Applic ation Develo pment and
Refact oring Enviro nment (written in
Perl 5)
Ecli pse with the EPIC plugin
http:/ /ww w.e pic -id e.org/ or with
Perlipse
http:/ /co de.g oo gle.co m/p /pe rlipse/
using dltk
Acti veS 
tate
propri etary Komodo IDE
http:/ /ww w.a cti ves tat e.c om/ Pro duc ts/ k
om odo _ide/ or free Komodo Edit
http:/ /ww w.a cti ves tat e.c om/ Pro duc ts/ k
om odo _id e/k omo do_ edi t.mhtml
Kephra http:/ /ke phr a.s our cef org e.net
Progra mmers Editor along perl-like
Paradigms, written in Perl
Gvim www.vi m.org with Perl support
http:/ /ww w.v im.o rg /sc rip ts/ scr ipt.ph p?
s cri pt_ id=556
 
Perl IDE (cont)
Emacs www.gn u.o rg/ sof twa re/ emacs/ with
CPerl Mode
http:/ /ww w.e mac swi ki.o rg /cg i-
b in/ wik i/C Per lMode
Perl
Develo 
pment
Tools
http:/ /ww w.p erl mon ks.o rg /?
n ode =Pe rl% 20D eve lop men t%2 0Tools
Escape sequences
\t tab (HT, TAB)
\n newline (LF, NL)
\r return (CR)
\f form feed (FF)
\a alarm (bell) (BEL)
\e escape (think troff) (ESC)
\cK control char (example: VT)
\x{}, \x00 character whose ordinal is the
given hexade cimal number
\N{name} amed Unicode character or
character sequence
\N{U+263D} Unicode character (example:
FIRST QUARTER MOON)
\o{}, \000 character whose ordinal is the
given octal number
\l lowercase next char (think vi)
\u uppercase next char (think vi)
\L lowercase till \E (think vi)
\U uppercase till \E (think vi)
 
Escape sequences (cont)
\Q quote (disable) pattern metach ara cters till
\E
\E end either case modifi cation or quoted
section, think vi
REFERENCES
\ $$foo[1] ==
references $foo->[1]
$@%&* $$foo{ bar}==
derefe rence $foo-> {bar}
{} ${$$fo o[1 ]}[2]==
anon. hashref $foo-> [1] ->[2]
\() ${$$fo o[1 ]}[2]==
list of refs $foo-> [1][2]
SPECIAL VARIABLES
$_ default variable
$0 program name
$/ input separator
$\ output separator
$| autoflush
$! sys/li bcall error
$@ eval error
$$ process ID
$. line number
@ARGV command line args
@INC include paths
@_ subroutine args
%ENV enviro nment
By Nikolay Mishin (mishin)
cheatography.com/mishin/
mishin.narod.ru
 
Published 1st June, 2012.
Last updated 5th June, 2014.
Page 4 of 5.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
perlcheat Cheat Sheet
by Nikolay Mishin (mishin) via cheatography.com/1008/cs/396/
NUMBERS vs STRINGS
NUMBERS STRINGS
= =
. .
== != eq ne
< > <= >= lt gt le ge
<=> cmp
DO
use Modern ::Perl;
use strict;
use warnings;
my $var;
open() or die $!;
use Modules;
DON'T
" $fo o"
$$vari abl e_name
$user input
/$user input/
capita lizing:
word: $foo = ucfirst lc $foo;
each word: $foo =~ s/(\w+ )/ \u\L $1/g;
refere ncing a subrou tine:
$SUBNAME = " jun k";
&$ SUB NAM E(@ PAR AME TERS);
 
foreach:
foreach $FILE (@FILES) { }
OPERATOR PRECEDENCE
->
++ --
**
! ~ \ u+ u-
=~ !~
* / % x
+ - .
<< >>
named uops
< > <= >= lt gt le ge
== != <=> eq ne cmp
&
| ^
&&
||
.. ...
?:
= += -= *= etc.
, =>
list ops
not
and
or xor
 
Link to perl cheat
perlcheat
http:/ /ww w.c hea tog rap hy.c om /mi shi n/c hea t-
s hee ts/ per lcheat/
perl-r efe ren ce-card
http:/ /ww w.c hea tog rap hy.c om /mi shi n/c hea t-
s hee ts/ per l-r efe ren ce- card/
20-kil ler -pe rl- pro gra mmi ng-tips
http:/ /ww w.c hea tog rap hy.c om /mi shi n/c hea t-
s hee ts/ 20- kil ler -pe rl- pro gra mmi ng- tip s-
f or- beg inners/
By Nikolay Mishin (mishin)
cheatography.com/mishin/
mishin.narod.ru
 
Published 1st June, 2012.
Last updated 5th June, 2014.
Page 5 of 5.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
	perlcheat Cheat Sheet - Page 1
	About Perlcheat
	SCALAR VALUES
	SYNTAX
	CONTEXTS
	LINKS
	SIGILS
	ARRAYS,HASHES
	perlcheat Cheat Sheet - Page 2
	Modern::Perl
	perlcheat Cheat Sheet - Page 3
	REGEX MODIFIERS
	REGEX METACHARS
	opendir & grep:
	FUNCTION RETURN LISTS
	hash iteration:
	getopt
	Perl image
	REGEX CHARCLASSES
	perlcheat Cheat Sheet - Page 4
	Perl IDE
	REFERENCES
	Escape sequences
	SPECIAL VARIABLES
	perlcheat Cheat Sheet - Page 5
	NUMBERS vs STRINGS
	foreach:
	Link to perl cheat
	OPERATOR PRECEDENCE
	DO
	DON'T
	capitalizing:
	referencing a subroutine: