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PERLUTIL(1)			 Perl Programmers Reference Guide		      PERLUTIL(1)

NAME
       perlutil - utilities packaged with the Perl distribution

DESCRIPTION
       Along with the Perl interpreter itself, the Perl distribution installs a range of
       utilities on your system. There are also several utilities which are used by the Perl
       distribution itself as part of the install process. This document exists to list all of
       these utilities, explain what they are for and provide pointers to each module's
       documentation, if appropriate.

LIST OF UTILITIES
   Documentation
       perldoc
	  The main interface to Perl's documentation is "perldoc", although if you're reading
	  this, it's more than likely that you've already found it. perldoc will extract and
	  format the documentation from any file in the current directory, any Perl module
	  installed on the system, or any of the standard documentation pages, such as this one.
	  Use "perldoc <name>" to get information on any of the utilities described in this
	  document.

       pod2man and pod2text
	  If it's run from a terminal, perldoc will usually call pod2man to translate POD (Plain
	  Old Documentation - see perlpod for an explanation) into a manpage, and then run man to
	  display it; if man isn't available, pod2text will be used instead and the output piped
	  through your favourite pager.

       pod2html and pod2latex
	  As well as these two, there are two other converters: pod2html will produce HTML pages
	  from POD, and pod2latex, which produces LaTeX files.

       pod2usage
	  If you just want to know how to use the utilities described here, pod2usage will just
	  extract the "USAGE" section; some of the utilities will automatically call pod2usage on
	  themselves when you call them with "-help".

       podselect
	  pod2usage is a special case of podselect, a utility to extract named sections from
	  documents written in POD. For instance, while utilities have "USAGE" sections, Perl
	  modules usually have "SYNOPSIS" sections: "podselect -s "SYNOPSIS" ..." will extract
	  this section for a given file.

       podchecker
	  If you're writing your own documentation in POD, the podchecker utility will look for
	  errors in your markup.

       splain
	  splain is an interface to perldiag - paste in your error message to it, and it'll
	  explain it for you.

       "roffitall"
	  The "roffitall" utility is not installed on your system but lives in the pod/ directory
	  of your Perl source kit; it converts all the documentation from the distribution to
	  *roff format, and produces a typeset PostScript or text file of the whole lot.

   Converters
       To help you convert legacy programs to Perl, we've included three conversion filters:

       a2p
	  a2p converts awk scripts to Perl programs; for example, "a2p -F:" on the simple awk
	  script "{print $2}" will produce a Perl program based around this code:

	      while (<>) {
		  ($Fld1,$Fld2) = split(/[:\n]/, $_, -1);
		  print $Fld2;
	      }

       s2p and psed
	  Similarly, s2p converts sed scripts to Perl programs. s2p run on "s/foo/bar" will
	  produce a Perl program based around this:

	      while (<>) {
		  chomp;
		  s/foo/bar/g;
		  print if $printit;
	      }

	  When invoked as psed, it behaves as a sed implementation, written in Perl.

       find2perl
	  Finally, find2perl translates "find" commands to Perl equivalents which use the
	  File::Find module. As an example, "find2perl . -user root -perm 4000 -print" produces
	  the following callback subroutine for "File::Find":

	      sub wanted {
		  my ($dev,$ino,$mode,$nlink,$uid,$gid);
		  (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
		  $uid == $uid{'root'}) &&
		  (($mode & 0777) == 04000);
		  print("$name\n");
	      }

       As well as these filters for converting other languages, the pl2pm utility will help you
       convert old-style Perl 4 libraries to new-style Perl5 modules.

   Administration
       config_data
	  Query or change configuration of Perl modules that use Module::Build-based
	  configuration files for features and config data.

       libnetcfg
	  To display and change the libnet configuration run the libnetcfg command.

       perlivp
	  The perlivp program is set up at Perl source code build time to test the Perl version
	  it was built under.  It can be used after running "make install" (or your platform's
	  equivalent procedure) to verify that perl and its libraries have been installed
	  correctly.

   Development
       There are a set of utilities which help you in developing Perl programs, and in
       particular, extending Perl with C.

       perlbug
	  perlbug is the recommended way to report bugs in the perl interpreter itself or any of
	  the standard library modules back to the developers; please read through the
	  documentation for perlbug thoroughly before using it to submit a bug report.

       perlthanks
	  This program provides an easy way to send a thank-you message back to the authors and
	  maintainers of perl. It's just perlbug installed under another name.

       h2ph
	  Back before Perl had the XS system for connecting with C libraries, programmers used to
	  get library constants by reading through the C header files. You may still see "require
	  'syscall.ph'" or similar around - the .ph file should be created by running h2ph on the
	  corresponding .h file. See the h2ph documentation for more on how to convert a whole
	  bunch of header files at once.

       c2ph and pstruct
	  c2ph and pstruct, which are actually the same program but behave differently depending
	  on how they are called, provide another way of getting at C with Perl - they'll convert
	  C structures and union declarations to Perl code. This is deprecated in favour of h2xs
	  these days.

       h2xs
	  h2xs converts C header files into XS modules, and will try and write as much glue
	  between C libraries and Perl modules as it can. It's also very useful for creating
	  skeletons of pure Perl modules.

       enc2xs
	  enc2xs builds a Perl extension for use by Encode from either Unicode Character Mapping
	  files (.ucm) or Tcl Encoding Files (.enc).  Besides being used internally during the
	  build process of the Encode module, you can use enc2xs to add your own encoding to
	  perl.  No knowledge of XS is necessary.

       xsubpp
	  xsubpp is a compiler to convert Perl XS code into C code.  It is typically run by the
	  makefiles created by ExtUtils::MakeMaker.

	  xsubpp will compile XS code into C code by embedding the constructs necessary to let C
	  functions manipulate Perl values and creates the glue necessary to let Perl access
	  those functions.

       prove
	  prove is a command-line interface to the test-running functionality of Test::Harness.
	  It's an alternative to "make test".

       corelist
	  A command-line front-end to "Module::CoreList", to query what modules were shipped with
	  given versions of perl.

   General tools
       A few general-purpose tools are shipped with perl, mostly because they came along modules
       included in the perl distribution.

       piconv
	  piconv is a Perl version of iconv, a character encoding converter widely available for
	  various Unixen today.  This script was primarily a technology demonstrator for Perl
	  5.8.0, but you can use piconv in the place of iconv for virtually any case.

       ptar
	  ptar is a tar-like program, written in pure Perl.

       ptardiff
	  ptardiff is a small utility that produces a diff between an extracted archive and an
	  unextracted one. (Note that this utility requires the "Text::Diff" module to function
	  properly; this module isn't distributed with perl, but is available from the CPAN.)

       ptargrep
	  ptargrep is a utility to apply pattern matching to the contents of files in a tar
	  archive.

       shasum
	  This utility, that comes with the "Digest::SHA" module, is used to print or verify SHA
	  checksums.

       zipdetails
	  zipdetails displays information about the internal record structure of the zip file.
	  It is not concerned with displaying any details of the compressed data stored in the
	  zip file.

   Installation
       These utilities help manage extra Perl modules that don't come with the perl distribution.

       cpan
	  cpan is a command-line interface to CPAN.pm.	It allows you to install modules or
	  distributions from CPAN, or just get information about them, and a lot more.	It is
	  similar to the command line mode of the CPAN module,

	      perl -MCPAN -e shell

       cpanp
	  cpanp is, like cpan, a command-line interface to the CPAN, using the "CPANPLUS" module
	  as a back-end. It can be used interactively or imperatively.

       cpan2dist
	  cpan2dist is a tool to create distributions (or packages) from CPAN modules, then
	  suitable for your package manager of choice. Support for specific formats are available
	  from CPAN as "CPANPLUS::Dist::*" modules.

       instmodsh
	  A little interface to ExtUtils::Installed to examine installed modules, validate your
	  packlists and even create a tarball from an installed module.

SEE ALSO
       perldoc, pod2man, perlpod, pod2html, pod2usage, podselect, podchecker, splain, perldiag,
       "roffitall|roffitall", a2p, s2p, find2perl, File::Find, pl2pm, perlbug, h2ph, c2ph, h2xs,
       enc2xs, xsubpp, cpan, cpanp, cpan2dist, instmodsh, piconv, prove, corelist, ptar,
       ptardiff, shasum, zipdetails

perl v5.16.3				    2013-03-04				      PERLUTIL(1)
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