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User Commandsperl(1)


NAME

 perl - Practical Extraction and Report Language

SYNOPSIS

 perl [-sTuU] [-hv] [-V[:configvar]] [-cw] [-d[:debugger]] [-D[number/list]] [-pna] [-Fpattern] [-l[octal]] [-0[octal]] [-Idir] [-m[-]module] [-M[-]'module...'] [-P] [-S] [-x[dir]] [-i[extension]] [-e 'command'] [--] [programfile] [argument] ...

DESCRIPTION

 

For ease of access, the Perl manual has been split up into several sections:

 
perl              Perl overview (this section)
perlfaq           Perl frequently asked questions
perltoc           Perl documentation table of contents
perlbook          Perl book information

perlsyn           Perl syntax
perldata          Perl data structures
perlop            Perl operators and precedence
perlsub           Perl subroutines
perlfunc          Perl builtin functions
perlreftut        Perl references short introduction
perldsc           Perl data structures intro
perlrequick       Perl regular expressions quick start
perlpod           Perl plain old documentation
perlstyle         Perl style guide
perltrap          Perl traps for the unwary

perlrun           Perl execution and options
perldiag          Perl diagnostic messages
perllexwarn       Perl warnings and their control
perldebtut        Perl debugging tutorial
perldebug         Perl debugging

perlvar           Perl predefined variables
perllol           Perl data structures: arrays of arrays
perlopentut       Perl open() tutorial
perlretut         Perl regular expressions tutorial

perlre            Perl regular expressions, the rest of the story
perlref           Perl references, the rest of the story

perlform          Perl formats
perlboot          Perl OO tutorial for beginners
perltoot          Perl OO tutorial, part 1
perltootc         Perl OO tutorial, part 2
perlobj           Perl objects
perlbot           Perl OO tricks and examples
perltie           Perl objects hidden behind simple variables

perlipc           Perl interprocess communication
perlfork          Perl fork() information
perlnumber        Perl number semantics
perlthrtut        Perl threads tutorial

perlport          Perl portability guide
perllocale        Perl locale support
perlunicode       Perl unicode support

perlsec           Perl security

perlmod           Perl modules: how they work
perlmodlib        Perl modules: how to write and use
perlmodinstall    Perl modules: how to install from CPAN
perlnewmod        Perl modules: preparing a new module for distribution

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

perlcompile       Perl compiler suite intro

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
perlclib          Internal replacements for standard C library functions
perlguts          Perl internal functions for those doing extensions
perlcall          Perl calling conventions from C
perlutil          utilities packaged with the Perl distribution
perlfilter        Perl source filters
perldbmfilter     Perl DBM filters
perlapi           Perl API listing (autogenerated)
perlintern        Perl internal functions (autogenerated)
perlapio          Perl internal IO abstraction interface
perltodo          Perl things to do
perlhack          Perl hackers guide

perlhist          Perl history records
perldelta         Perl changes since previous version
perl5005delta     Perl changes in version 5.005
perl5004delta     Perl changes in version 5.004

perlsolaris       Perl notes for Solaris

(If you're intending to read these straight through for the first time, the suggested order will tend to reduce the number of forward references.)

The manpages listed above are installed in the /usr/perl5/man/ directory.

Extensive additional documentation for Perl modules is available. This additional documentation is also in the /usr/local/lib/perl5/man directory. Some of this additional documentation is distributed as standard with Perl, but you'll also find documentation for any customer-installed third-party modules there.

Notice that running catman(1M) on the Perl manual pages is not supported. For other Solaris-specific details, see the NOTES section below.

You can also use the supplied /usr/perl5/bin/perldoc script to view Perl information.

If something strange has gone wrong with your program and you're not sure where you should look for help, try the -w switch first. It will often point out exactly where the trouble is.

Perl is a language optimized for scanning arbitrary text files, extracting information from those text files, and printing reports based on that information. It's also a good language for many system management tasks. The language is intended to be practical (easy to use, efficient, complete) rather than beautiful (tiny, elegant, minimal).

Perl combines (in the author's opinion, anyway) some of the best features of C, sed, awk, and sh, so people familiar with those languages should have little difficulty with it. (Language historians will also note some vestiges of csh, Pascal, and even BASIC-PLUS.) Expression syntax corresponds quite closely to C expression syntax. Unlike most Unix utilities, Perl does not arbitrarily limit the size of your data--if you've got the memory, Perl can slurp in your whole file as a single string. Recursion is of unlimited depth. And the tables used by hashes (sometimes called "associative arrays") grow as necessary to prevent degraded performance. Perl can use sophisticated pattern matching techniques to scan large amounts of data quickly. Although optimized for scanning text, Perl can also deal with binary data, and can make dbm files look like hashes. Setuid Perl scripts are safer than C programs through a dataflow tracing mechanism that prevents many stupid security holes.

If you have a problem that would ordinarily use sed or awk or sh, but it exceeds their capabilities or must run a little faster, and you don't want to write the silly thing in C, then Perl may be for you. There are also translators to turn your sed and awk scripts into Perl scripts.

But wait, there's more...

Begun in 1993 (see the perlhist man page), Perl version 5 is nearly a complete rewrite that provides the following additional benefits:

o Modularity and reusability using innumerable modules
Described in the perlmod man page, the perlmodlib man page, and the perlmodinstall man page.
o Embeddable and Extensible
Described in the perlembed man page, the perlxstut man page, the perlxs man page, the perlcall man page, the perlguts man page, and the xsubpp man page.
o Roll-your-own magic variables
(Including multiple simultaneous DBM implementations) Described in the perltie man page and the AnyDBM_File man page.
o Subroutines can now be overridden,
autoloaded, and prototyped. Described in the perlsub man page.
o Arbitrarily nested data structures
and anonymous functions. Described in the perlreftut man page, the perlref man page, the perldsc man page, and the perllol man page.
o Object-oriented programming
Described in the perlobj man page, the perltoot man page, and the perlbot man page.
o Compilability into C code or Perl bytecode
Described in the B man page and the B::Bytecode man page.
o Support for light-weight processes (threads)
Described in the perlthrtut man page and the Thread man page. Notice that the Perl shipped as part of Solaris does NOT have threads support enabled. If you require threads support, you should build and install your own Perl version (see the NOTES section below).
o Support for internationalization, localization,
and Unicode. Described in the perllocale man page and the utf8 man page.
o Lexical scoping
Described in the perlsub man page.
o Regular expression enhancements
Described in the perlre man page, with additional examples in the perlop man page.
o Enhanced debugger and interactive Perl environment,
with integrated editor support. Described in the perldebug man page.
o POSIX 1003.1 compliant
Described in the POSIX man page.

Okay, that's definitely enough hype.

AVAILABILITY

 

Perl is available for most operating systems, including virtually all Unix-like platforms. See the Supported Platforms entry in the perlport man page for a listing.

ENVIRONMENT

 

The Perl shipped with Solaris is installed under /usr/perl5 rather than the default /usr/local location. This is so that it can coexist with a customer-installed Perl in the default /usr/local location.

Any additional modules that you choose to install will be placed in the /usr/perl5/site_perl/5.6.1 directory. The /usr/perl5/vendor_perl directory is reserved for SMI-provided modules.

Notice that the Perl utility scripts such as perldoc and perlbug are in the /usr/perl5/bin directory, so if you wish to use them you need to include /usr/perl5/bin in your PATH environment variable.

See also the perlrun man page.

AUTHOR

 

Larry Wall , with the help of oodles of other folks.

FILES

 
"@INC"
Locations of Perl libraries

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
AvailabilitySUNWpl5u SUNWpl5m
 SUNWpl5p
 SUNWopl5u SUNWopl5m
 SUNWopl5p
Interface Stability 
o Script interfaceEvolving
o XSUB interfaceEvolving
o Binary interfaceUnstable
o Directory layoutEvolving

SEE ALSO

 
a2p
awk to perl translator
s2p
sed to perl translator
http://www.perl.com/
The Perl Home Page
http://www.perl.com/CPAN
The Comprehensive Perl Archive

DIAGNOSTICS

 

The "use warnings" pragma (and the -w switch) produces some lovely diagnostics.

See the perldiag man page for explanations of all Perl's diagnostics. The "use diagnostics" pragma automatically turns Perl's normally terse warnings and errors into these longer forms.

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 -e switches, each -e is counted as one line.)

Setuid scripts have additional constraints that can produce error messages such as "Insecure dependency". See the perlsec man page.

Did we mention that you should definitely consider using the -w switch?

NOTES

 

Solaris 9 contains two versions of Perl, 5.005_03 (as shipped in Solaris 8) and 5.6.1. /bin/perl is a link to the 5.6.1 interpreter, and /usr/perl5/bin is a link to the /usr/perl5/5.6.1/bin directory. It is likely that version 5.005_03 will be removed in a future release of Solaris.

Perl 5.6.1 has been built to be largefile-aware and to use 64-bit integers, although the interpreter itself is a 32-bit application (LP32). To view detailed configuration information, use perl -V and perlbug -dv.

Notice that 5.6.1 is binary incompatible with the 5.005_03 version, primarily due to the addition of largefile/64-bit integer support. Existing customer-installed XSUB-based modules will require recompilation, and non-XSUB modules will require reinstallation.

If you have any applications that require 5.005_03, you should make sure they explicitly use /usr/perl5/5.005_03/bin/perl. It is also possible to make 5.005_03 the default Perl version, although this is not recommended. The steps for this would be (as root):

 
# rm /usr/bin/perl
# ln -s ../perl5/5.00503/bin/perl /usr/bin/perl
# rm /usr/perl5/bin
# ln -s ./5.00503/bin /usr/perl5/bin
# rm /usr/perl5/man
# ln -s ./5.00503/man /usr/perl5/man
# rm /usr/perl5/pod
# ln -s ./5.00503/pod /usr/perl5/pod

If you wish to build and install your own version of Perl, you should NOT remove the 5.6.1 version of perl under /usr/perl5, as it is required by several system utilities. If you do not want to use the 5.005_03 version, you may remove that if you wish. The Perl package names are as follows:

 
SUNWpl5u     Perl 5.6.1
SUNWpl5p     Perl 5.6.1 (POD Documentation)
SUNWpl5m     Perl 5.6.1 (Manual pages)
SUNWopl5u    Perl 5.005_03
SUNWopl5p    Perl 5.005_03 (POD Documentation)
SUNWopl5m    Perl 5.005_03 (Manual pages)

The Perl motto is "There's more than one way to do it." Divining how many more is left as an exercise to the reader.

The three principal virtues of a programmer are Laziness, Impatience, and Hubris. See the Camel Book for why.

BUGS

 

The -w switch is not mandatory.

Perl is at the mercy of your machine's definitions of various operations such as type casting, atof(), and floating-point output with sprintf().

If your stdio requires a seek or eof between reads and writes on a particular stream, so does Perl. (This doesn't apply to sysread() and syswrite().)

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).

You may mail your bug reports (be sure to include full configuration information as output by the myconfig program in the Perl source tree, or by perl -V) to <perlbug@perl.org>.

Perl actually stands for Pathologically Eclectic Rubbish Lister, but don't tell anyone I said that.


SunOS 5.9Go To TopLast Changed 7 Dec 2001

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.