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.\" ========================================================================
.\"
.IX Title "PERL 1"
.TH PERL 1 "2020-02-29" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
perl \- The Perl 5 language interpreter
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBperl\fR [\ \fB\-sTtuUWX\fR\ ]
[\ \fB\-hv\fR\ ]\ [\ \fB\-V\fR[:\fIconfigvar\fR]\ ]
[\ \fB\-cw\fR\ ]\ [\ \fB\-d\fR[\fBt\fR][:\fIdebugger\fR]\ ]\ [\ \fB\-D\fR[\fInumber/list\fR]\ ]
[\ \fB\-pna\fR\ ]\ [\ \fB\-F\fR\fIpattern\fR\ ]\ [\ \fB\-l\fR[\fIoctal\fR]\ ]\ [\ \fB\-0\fR[\fIoctal/hexadecimal\fR]\ ]
[\ \fB\-I\fR\fIdir\fR\ ]\ [\ \fB\-m\fR[\fB\-\fR]\fImodule\fR\ ]\ [\ \fB\-M\fR[\fB\-\fR]\fI'module...'\fR\ ]\ [\ \fB\-f\fR\ ]
[\ \fB\-C\ [\f(BInumber/list\fB]\ \fR]
[\ \fB\-S\fR\ ]
[\ \fB\-x\fR[\fIdir\fR]\ ]
[\ \fB\-i\fR[\fIextension\fR]\ ]
[\ [\fB\-e\fR|\fB\-E\fR]\ \fI'command'\fR\ ]\ [\ \fB\-\-\fR\ ]\ [\ \fIprogramfile\fR\ ]\ [\ \fIargument\fR\ ]...
.PP
For more information on these options, you can run \f(CW\*(C`perldoc perlrun\*(C'\fR.
.SH "GETTING HELP"
.IX Header "GETTING HELP"
The \fIperldoc\fR program gives you access to all the documentation that comes
with Perl. You can get more documentation, tutorials and community support
online at <http://www.perl.org/>.
.PP
If you're new to Perl, you should start by running \f(CW\*(C`perldoc perlintro\*(C'\fR,
which is a general intro for beginners and provides some background to help
you navigate the rest of Perl's extensive documentation. Run \f(CW\*(C`perldoc
perldoc\*(C'\fR to learn more things you can do with \fIperldoc\fR.
.PP
For ease of access, the Perl manual has been split up into several sections.
.SS "Overview"
.IX Subsection "Overview"
.Vb 4
\& perl Perl overview (this section)
\& perlintro Perl introduction for beginners
\& perlrun Perl execution and options
\& perltoc Perl documentation table of contents
.Ve
.SS "Tutorials"
.IX Subsection "Tutorials"
.Vb 3
\& perlreftut Perl references short introduction
\& perldsc Perl data structures intro
\& perllol Perl data structures: arrays of arrays
\&
\& perlrequick Perl regular expressions quick start
\& perlretut Perl regular expressions tutorial
\&
\& perlootut Perl OO tutorial for beginners
\&
\& perlperf Perl Performance and Optimization Techniques
\&
\& perlstyle Perl style guide
\&
\& perlcheat Perl cheat sheet
\& perltrap Perl traps for the unwary
\& perldebtut Perl debugging tutorial
\&
\& perlfaq Perl frequently asked questions
\& perlfaq1 General Questions About Perl
\& perlfaq2 Obtaining and Learning about Perl
\& perlfaq3 Programming Tools
\& perlfaq4 Data Manipulation
\& perlfaq5 Files and Formats
\& perlfaq6 Regexes
\& perlfaq7 Perl Language Issues
\& perlfaq8 System Interaction
\& perlfaq9 Networking
.Ve
.SS "Reference Manual"
.IX Subsection "Reference Manual"
.Vb 10
\& perlsyn Perl syntax
\& perldata Perl data structures
\& perlop Perl operators and precedence
\& perlsub Perl subroutines
\& perlfunc Perl built\-in functions
\& perlopentut Perl open() tutorial
\& perlpacktut Perl pack() and unpack() tutorial
\& perlpod Perl plain old documentation
\& perlpodspec Perl plain old documentation format specification
\& perlpodstyle Perl POD style guide
\& perldiag Perl diagnostic messages
\& perldeprecation Perl deprecations
\& perllexwarn Perl warnings and their control
\& perldebug Perl debugging
\& perlvar Perl predefined variables
\& perlre Perl regular expressions, the rest of the story
\& perlrebackslash Perl regular expression backslash sequences
\& perlrecharclass Perl regular expression character classes
\& perlreref Perl regular expressions quick reference
\& perlref Perl references, the rest of the story
\& perlform Perl formats
\& perlobj Perl objects
\& perltie Perl objects hidden behind simple variables
\& perldbmfilter Perl DBM filters
\&
\& perlipc Perl interprocess communication
\& perlfork Perl fork() information
\& perlnumber Perl number semantics
\&
\& perlthrtut Perl threads tutorial
\&
\& perlport Perl portability guide
\& perllocale Perl locale support
\& perluniintro Perl Unicode introduction
\& perlunicode Perl Unicode support
\& perlunicook Perl Unicode cookbook
\& perlunifaq Perl Unicode FAQ
\& perluniprops Index of Unicode properties in Perl
\& perlunitut Perl Unicode tutorial
\& perlebcdic Considerations for running Perl on EBCDIC platforms
\&
\& perlsec Perl security
\&
\& perlmod Perl modules: how they work
\& perlmodlib Perl modules: how to write and use
\& perlmodstyle Perl modules: how to write modules with style
\& perlmodinstall Perl modules: how to install from CPAN
\& perlnewmod Perl modules: preparing a new module for distribution
\& perlpragma Perl modules: writing a user pragma
\&
\& perlutil utilities packaged with the Perl distribution
\&
\& perlfilter Perl source filters
\&
\& perldtrace Perl\*(Aqs support for DTrace
\&
\& perlglossary Perl Glossary
.Ve
.SS "Internals and C Language Interface"
.IX Subsection "Internals and C Language Interface"
.Vb 11
\& perlembed Perl ways to embed perl in your C or C++ application
\& perldebguts Perl debugging guts and tips
\& perlxstut Perl XS tutorial
\& perlxs Perl XS application programming interface
\& perlxstypemap Perl XS C/Perl type conversion tools
\& perlclib Internal replacements for standard C library functions
\& perlguts Perl internal functions for those doing extensions
\& perlcall Perl calling conventions from C
\& perlmroapi Perl method resolution plugin interface
\& perlreapi Perl regular expression plugin interface
\& perlreguts Perl regular expression engine internals
\&
\& perlapi Perl API listing (autogenerated)
\& perlintern Perl internal functions (autogenerated)
\& perliol C API for Perl\*(Aqs implementation of IO in Layers
\& perlapio Perl internal IO abstraction interface
\&
\& perlhack Perl hackers guide
\& perlsource Guide to the Perl source tree
\& perlinterp Overview of the Perl interpreter source and how it works
\& perlhacktut Walk through the creation of a simple C code patch
\& perlhacktips Tips for Perl core C code hacking
\& perlpolicy Perl development policies
\& perlgit Using git with the Perl repository
.Ve
.SS "Miscellaneous"
.IX Subsection "Miscellaneous"
.Vb 2
\& perlbook Perl book information
\& perlcommunity Perl community information
\&
\& perldoc Look up Perl documentation in Pod format
\&
\& perlhist Perl history records
\& perldelta Perl changes since previous version
\& perl5301delta Perl changes in version 5.30.1
\& perl5300delta Perl changes in version 5.30.0
\& perl5282delta Perl changes in version 5.28.2
\& perl5281delta Perl changes in version 5.28.1
\& perl5280delta Perl changes in version 5.28.0
\& perl5263delta Perl changes in version 5.26.3
\& perl5262delta Perl changes in version 5.26.2
\& perl5261delta Perl changes in version 5.26.1
\& perl5260delta Perl changes in version 5.26.0
\& perl5244delta Perl changes in version 5.24.4
\& perl5243delta Perl changes in version 5.24.3
\& perl5242delta Perl changes in version 5.24.2
\& perl5241delta Perl changes in version 5.24.1
\& perl5240delta Perl changes in version 5.24.0
\& perl5224delta Perl changes in version 5.22.4
\& perl5223delta Perl changes in version 5.22.3
\& perl5222delta Perl changes in version 5.22.2
\& perl5221delta Perl changes in version 5.22.1
\& perl5220delta Perl changes in version 5.22.0
\& perl5203delta Perl changes in version 5.20.3
\& perl5202delta Perl changes in version 5.20.2
\& perl5201delta Perl changes in version 5.20.1
\& perl5200delta Perl changes in version 5.20.0
\& perl5184delta Perl changes in version 5.18.4
\& perl5182delta Perl changes in version 5.18.2
\& perl5181delta Perl changes in version 5.18.1
\& perl5180delta Perl changes in version 5.18.0
\& perl5163delta Perl changes in version 5.16.3
\& perl5162delta Perl changes in version 5.16.2
\& perl5161delta Perl changes in version 5.16.1
\& perl5160delta Perl changes in version 5.16.0
\& perl5144delta Perl changes in version 5.14.4
\& perl5143delta Perl changes in version 5.14.3
\& perl5142delta Perl changes in version 5.14.2
\& perl5141delta Perl changes in version 5.14.1
\& perl5140delta Perl changes in version 5.14.0
\& perl5125delta Perl changes in version 5.12.5
\& perl5124delta Perl changes in version 5.12.4
\& perl5123delta Perl changes in version 5.12.3
\& perl5122delta Perl changes in version 5.12.2
\& perl5121delta Perl changes in version 5.12.1
\& perl5120delta Perl changes in version 5.12.0
\& perl5101delta Perl changes in version 5.10.1
\& perl5100delta Perl changes in version 5.10.0
\& perl589delta Perl changes in version 5.8.9
\& perl588delta Perl changes in version 5.8.8
\& perl587delta Perl changes in version 5.8.7
\& perl586delta Perl changes in version 5.8.6
\& perl585delta Perl changes in version 5.8.5
\& perl584delta Perl changes in version 5.8.4
\& perl583delta Perl changes in version 5.8.3
\& perl582delta Perl changes in version 5.8.2
\& perl581delta Perl changes in version 5.8.1
\& perl58delta Perl changes in version 5.8.0
\& perl561delta Perl changes in version 5.6.1
\& perl56delta Perl changes in version 5.6
\& perl5005delta Perl changes in version 5.005
\& perl5004delta Perl changes in version 5.004
\&
\& perlexperiment A listing of experimental features in Perl
\&
\& perlartistic Perl Artistic License
\& perlgpl GNU General Public License
.Ve
.SS "Language-Specific"
.IX Subsection "Language-Specific"
.Vb 4
\& perlcn Perl for Simplified Chinese (in EUC\-CN)
\& perljp Perl for Japanese (in EUC\-JP)
\& perlko Perl for Korean (in EUC\-KR)
\& perltw Perl for Traditional Chinese (in Big5)
.Ve
.SS "Platform-Specific"
.IX Subsection "Platform-Specific"
.Vb 10
\& perlaix Perl notes for AIX
\& perlamiga Perl notes for AmigaOS
\& perlandroid Perl notes for Android
\& perlbs2000 Perl notes for POSIX\-BC BS2000
\& perlce Perl notes for WinCE
\& perlcygwin Perl notes for Cygwin
\& perldos Perl notes for DOS
\& perlfreebsd Perl notes for FreeBSD
\& perlhaiku Perl notes for Haiku
\& perlhpux Perl notes for HP\-UX
\& perlhurd Perl notes for Hurd
\& perlirix Perl notes for Irix
\& perllinux Perl notes for Linux
\& perlmacos Perl notes for Mac OS (Classic)
\& perlmacosx Perl notes for Mac OS X
\& perlnetware Perl notes for NetWare
\& perlopenbsd Perl notes for OpenBSD
\& perlos2 Perl notes for OS/2
\& perlos390 Perl notes for OS/390
\& perlos400 Perl notes for OS/400
\& perlplan9 Perl notes for Plan 9
\& perlqnx Perl notes for QNX
\& perlriscos Perl notes for RISC OS
\& perlsolaris Perl notes for Solaris
\& perlsymbian Perl notes for Symbian
\& perlsynology Perl notes for Synology
\& perltru64 Perl notes for Tru64
\& perlvms Perl notes for VMS
\& perlvos Perl notes for Stratus VOS
\& perlwin32 Perl notes for Windows
.Ve
.SS "Stubs for Deleted Documents"
.IX Subsection "Stubs for Deleted Documents"
.Vb 6
\& perlboot
\& perlbot
\& perlrepository
\& perltodo
\& perltooc
\& perltoot
.Ve
.PP
On a Unix-like system, these documentation files will usually also be
available as manpages for use with the \fIman\fR program.
.PP
Some documentation is not available as man pages, so if a
cross-reference is not found by man, try it with perldoc. Perldoc can
also take you directly to documentation for functions (with the \fB\-f\fR
switch). See \f(CW\*(C`perldoc \-\-help\*(C'\fR (or \f(CW\*(C`perldoc perldoc\*(C'\fR or \f(CW\*(C`man perldoc\*(C'\fR)
for other helpful options perldoc has to offer.
.PP
In general, if something strange has gone wrong with your program and you're
not sure where you should look for help, try making your code comply with
\&\fBuse strict\fR and \fBuse warnings\fR. These will often point out exactly
where the trouble is.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Perl officially stands for Practical Extraction and Report Language,
except when it doesn't.
.PP
Perl was originally a language optimized for scanning arbitrary
text files, extracting information from those text files, and printing
reports based on that information. It quickly became a good language
for many system management tasks. Over the years, Perl has grown into
a general-purpose programming language. It's widely used for everything
from quick \*(L"one-liners\*(R" to full-scale application development.
.PP
The language is intended to be practical (easy to use, efficient,
complete) rather than beautiful (tiny, elegant, minimal). It combines
(in the author's opinion, anyway) some of the best features of \fBsed\fR,
\&\fBawk\fR, and \fBsh\fR, making it familiar and easy to use for Unix users to
whip up quick solutions to annoying problems. Its general-purpose
programming facilities support procedural, functional, and
object-oriented programming paradigms, making Perl a comfortable
language for the long haul on major projects, whatever your bent.
.PP
Perl's roots in text processing haven't been forgotten over the years.
It still boasts some of the most powerful regular expressions to be
found anywhere, and its support for Unicode text is world-class. It
handles all kinds of structured text, too, through an extensive
collection of extensions. Those libraries, collected in the \s-1CPAN,\s0
provide ready-made solutions to an astounding array of problems. When
they haven't set the standard themselves, they steal from the best
\&\*(-- just like Perl itself.
.SH "AVAILABILITY"
.IX Header "AVAILABILITY"
Perl is available for most operating systems, including virtually
all Unix-like platforms. See \*(L"Supported Platforms\*(R" in perlport
for a listing.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
See perlrun.
.SH "AUTHOR"
.IX Header "AUTHOR"
Larry Wall <larry@wall.org>, with the help of oodles of other folks.
.PP
If your Perl success stories and testimonials may be of help to others
who wish to advocate the use of Perl in their applications,
or if you wish to simply express your gratitude to Larry and the
Perl developers, please write to perl\-thanks@perl.org .
.SH "FILES"
.IX Header "FILES"
.Vb 1
\& "@INC" locations of perl libraries
.Ve
.PP
\&\*(L"@INC\*(R" above is a reference to the built-in variable of the same name;
see perlvar for more information.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.Vb 4
\& http://www.perl.org/ the Perl homepage
\& http://www.perl.com/ Perl articles (O\*(AqReilly)
\& http://www.cpan.org/ the Comprehensive Perl Archive
\& http://www.pm.org/ the Perl Mongers
.Ve
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
Using the \f(CW\*(C`use strict\*(C'\fR pragma ensures that all variables are properly
declared and prevents other misuses of legacy Perl features.
.PP
The \f(CW\*(C`use warnings\*(C'\fR pragma produces some lovely diagnostics. One can
also use the \fB\-w\fR flag, but its use is normally discouraged, because
it gets applied to all executed Perl code, including that not under
your control.
.PP
See perldiag for explanations of all Perl's diagnostics. The \f(CW\*(C`use
diagnostics\*(C'\fR pragma automatically turns Perl's normally terse warnings
and errors into these longer forms.
.PP
Compilation errors will tell you the line number of the error, with an
indication of the next token or token type that was to be examined.
(In a script passed to Perl via \fB\-e\fR switches, each
\&\fB\-e\fR is counted as one line.)
.PP
Setuid scripts have additional constraints that can produce error
messages such as \*(L"Insecure dependency\*(R". See perlsec.
.PP
Did we mention that you should definitely consider using the \fBuse warnings\fR
pragma?
.SH "BUGS"
.IX Header "BUGS"
The behavior implied by the \fBuse warnings\fR pragma is not mandatory.
.PP
Perl is at the mercy of your machine's definitions of various
operations such as type casting, \fBatof()\fR, and floating-point
output with \fBsprintf()\fR.
.PP
If your stdio requires a seek or eof between reads and writes on a
particular stream, so does Perl. (This doesn't apply to \fBsysread()\fR
and \fBsyswrite()\fR.)
.PP
While none of the built-in data types have any arbitrary size limits
(apart from memory size), there are still a few arbitrary limits: a
given variable name may not be longer than 251 characters. Line numbers
displayed by diagnostics are internally stored as short integers,
so they are limited to a maximum of 65535 (higher numbers usually being
affected by wraparound).
.PP
You may submit your bug reports (be sure to include full configuration
information as output by the myconfig program in the perl source
tree, or by \f(CW\*(C`perl \-V\*(C'\fR) to <https://github.com/Perl/perl5/issues>.
.PP
Perl actually stands for Pathologically Eclectic Rubbish Lister, but
don't tell anyone I said that.
.SH "NOTES"
.IX Header "NOTES"
The Perl motto is \*(L"There's more than one way to do it.\*(R" Divining
how many more is left as an exercise to the reader.
.PP
The three principal virtues of a programmer are Laziness,
Impatience, and Hubris. See the Camel Book for why.