Max Maischein > perl-5.17.10 > perlmodlib

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NAME ^

perlmodlib - constructing new Perl modules and finding existing ones

THE PERL MODULE LIBRARY ^

Many modules are included in the Perl distribution. These are described below, and all end in .pm. You may discover compiled library files (usually ending in .so) or small pieces of modules to be autoloaded (ending in .al); these were automatically generated by the installation process. You may also discover files in the library directory that end in either .pl or .ph. These are old libraries supplied so that old programs that use them still run. The .pl files will all eventually be converted into standard modules, and the .ph files made by h2ph will probably end up as extension modules made by h2xs. (Some .ph values may already be available through the POSIX, Errno, or Fcntl modules.) The pl2pm file in the distribution may help in your conversion, but it's just a mechanical process and therefore far from bulletproof.

Pragmatic Modules

They work somewhat like compiler directives (pragmata) in that they tend to affect the compilation of your program, and thus will usually work well only when used within a use, or no. Most of these are lexically scoped, so an inner BLOCK may countermand them by saying:

    no integer;
    no strict 'refs';
    no warnings;

which lasts until the end of that BLOCK.

Some pragmas are lexically scoped--typically those that affect the $^H hints variable. Others affect the current package instead, like use vars and use subs, which allow you to predeclare a variables or subroutines within a particular file rather than just a block. Such declarations are effective for the entire file for which they were declared. You cannot rescind them with no vars or no subs.

The following pragmas are defined (and have their own documentation).

Standard Modules

Standard, bundled modules are all expected to behave in a well-defined manner with respect to namespace pollution because they use the Exporter module. See their own documentation for details.

It's possible that not all modules listed below are installed on your system. For example, the GDBM_File module will not be installed if you don't have the gdbm library.

To find out all modules installed on your system, including those without documentation or outside the standard release, just use the following command (under the default win32 shell, double quotes should be used instead of single quotes).

    % perl -MFile::Find=find -MFile::Spec::Functions -Tlwe \
      'find { wanted => sub { print canonpath $_ if /\.pm\z/ },
      no_chdir => 1 }, @INC'

(The -T is here to prevent '.' from being listed in @INC.) They should all have their own documentation installed and accessible via your system man(1) command. If you do not have a find program, you can use the Perl find2perl program instead, which generates Perl code as output you can run through perl. If you have a man program but it doesn't find your modules, you'll have to fix your manpath. See perl for details. If you have no system man command, you might try the perldoc program.

Note also that the command perldoc perllocal gives you a (possibly incomplete) list of the modules that have been further installed on your system. (The perllocal.pod file is updated by the standard MakeMaker install process.)

Extension Modules

Extension modules are written in C (or a mix of Perl and C). They are usually dynamically loaded into Perl if and when you need them, but may also be linked in statically. Supported extension modules include Socket, Fcntl, and POSIX.

Many popular C extension modules do not come bundled (at least, not completely) due to their sizes, volatility, or simply lack of time for adequate testing and configuration across the multitude of platforms on which Perl was beta-tested. You are encouraged to look for them on CPAN (described below), or using web search engines like Alta Vista or Google.

CPAN ^

CPAN stands for Comprehensive Perl Archive Network; it's a globally replicated trove of Perl materials, including documentation, style guides, tricks and traps, alternate ports to non-Unix systems and occasional binary distributions for these. Search engines for CPAN can be found at http://www.cpan.org/

Most importantly, CPAN includes around a thousand unbundled modules, some of which require a C compiler to build. Major categories of modules are:

The list of the registered CPAN sites follows. Please note that the sorting order is alphabetical on fields:

Continent | |-->Country | |-->[state/province] | |-->ftp | |-->[http]

and thus the North American servers happen to be listed between the European and the South American sites.

Registered CPAN sites

Africa

South Africa
  http://cpan.mirror.ac.za/
  ftp://cpan.mirror.ac.za/
  http://mirror.is.co.za/pub/cpan/
  ftp://ftp.is.co.za/pub/cpan/
  ftp://ftp.saix.net/pub/CPAN/

Asia

China
  http://cpan.wenzk.com/
Hong Kong
  http://ftp.cuhk.edu.hk/pub/packages/perl/CPAN/
  ftp://ftp.cuhk.edu.hk/pub/packages/perl/CPAN/
  http://mirrors.geoexpat.com/cpan/
India
  http://perlmirror.indialinks.com/
Indonesia
  http://cpan.biz.net.id/
  http://komo.vlsm.org/CPAN/
  ftp://komo.vlsm.org/CPAN/
  http://cpan.cermin.lipi.go.id/
  ftp://cermin.lipi.go.id/pub/CPAN/
  http://cpan.pesat.net.id/
Japan
  ftp://ftp.u-aizu.ac.jp/pub/CPAN
  ftp://ftp.kddilabs.jp/CPAN/
  http://ftp.nara.wide.ad.jp/pub/CPAN/
  ftp://ftp.nara.wide.ad.jp/pub/CPAN/
  http://ftp.jaist.ac.jp/pub/CPAN/
  ftp://ftp.jaist.ac.jp/pub/CPAN/
  ftp://ftp.dti.ad.jp/pub/lang/CPAN/
  ftp://ftp.ring.gr.jp/pub/lang/perl/CPAN/
  http://ftp.riken.jp/lang/CPAN/
  ftp://ftp.riken.jp/lang/CPAN/
  http://ftp.yz.yamagata-u.ac.jp/pub/lang/cpan/
  ftp://ftp.yz.yamagata-u.ac.jp/pub/lang/cpan/
Republic of Korea
  http://ftp.kaist.ac.kr/pub/CPAN
  ftp://ftp.kaist.ac.kr/pub/CPAN
  http://cpan.mirror.cdnetworks.com/
  ftp://cpan.mirror.cdnetworks.com/CPAN/
  http://cpan.sarang.net/
  ftp://cpan.sarang.net/CPAN/
Russia
  http://cpan.tomsk.ru/
  ftp://cpan.tomsk.ru/
Singapore
  http://mirror.averse.net/pub/CPAN
  ftp://mirror.averse.net/pub/CPAN
  http://cpan.mirror.choon.net/
  http://cpan.oss.eznetsols.org
  ftp://ftp.oss.eznetsols.org/cpan
Taiwan
  http://ftp.cse.yzu.edu.tw/pub/CPAN/
  ftp://ftp.cse.yzu.edu.tw/pub/CPAN/
  http://cpan.nctu.edu.tw/
  ftp://cpan.nctu.edu.tw/
  ftp://ftp.ncu.edu.tw/CPAN/
  http://cpan.cdpa.nsysu.edu.tw/
  ftp://cpan.cdpa.nsysu.edu.tw/Unix/Lang/CPAN/
  http://cpan.stu.edu.tw
  ftp://ftp.stu.edu.tw/CPAN
  http://ftp.stu.edu.tw/CPAN
  ftp://ftp.stu.edu.tw/pub/CPAN
  http://cpan.cs.pu.edu.tw/
  ftp://cpan.cs.pu.edu.tw/pub/CPAN
Thailand
  http://mirrors.issp.co.th/cpan/
  ftp://mirrors.issp.co.th/cpan/
  http://mirror.yourconnect.com/CPAN/
  ftp://mirror.yourconnect.com/CPAN/
Turkey
  http://cpan.gazi.edu.tr/

Central America

Costa Rica
  http://mirrors.ucr.ac.cr/CPAN/
  ftp://mirrors.ucr.ac.cr/CPAN/

Europe

Austria
  http://cpan.inode.at/
  ftp://cpan.inode.at
  http://gd.tuwien.ac.at/languages/perl/CPAN/
  ftp://gd.tuwien.ac.at/pub/CPAN/
Belgium
  http://ftp.belnet.be/mirror/ftp.cpan.org/
  ftp://ftp.belnet.be/mirror/ftp.cpan.org/
  http://ftp.easynet.be/pub/CPAN/
  http://cpan.weepee.org/
Bosnia and Herzegovina
  http://cpan.blic.net/
Bulgaria
  http://cpan.cbox.biz/
  ftp://cpan.cbox.biz/cpan/
  http://cpan.digsys.bg/
  ftp://ftp.digsys.bg/pub/CPAN
Croatia
  http://ftp.carnet.hr/pub/CPAN/
  ftp://ftp.carnet.hr/pub/CPAN/
Czech Republic
  ftp://ftp.fi.muni.cz/pub/CPAN/
  http://archive.cpan.cz/
Denmark
  http://mirrors.dotsrc.org/cpan
  ftp://mirrors.dotsrc.org/cpan/
  http://www.cpan.dk/
  http://mirror.uni-c.dk/pub/CPAN/
Finland
  ftp://ftp.funet.fi/pub/languages/perl/CPAN/
  http://mirror.eunet.fi/CPAN
France
  http://cpan.enstimac.fr/
  ftp://ftp.inria.fr/pub/CPAN/
  http://distrib-coffee.ipsl.jussieu.fr/pub/mirrors/cpan/
  ftp://distrib-coffee.ipsl.jussieu.fr/pub/mirrors/cpan/
  ftp://ftp.lip6.fr/pub/perl/CPAN/
  http://mir2.ovh.net/ftp.cpan.org
  ftp://mir1.ovh.net/ftp.cpan.org
  ftp://ftp.oleane.net/pub/CPAN/
  http://ftp.crihan.fr/mirrors/ftp.cpan.org/
  ftp://ftp.crihan.fr/mirrors/ftp.cpan.org/
  http://ftp.u-strasbg.fr/CPAN
  ftp://ftp.u-strasbg.fr/CPAN
  http://cpan.cict.fr/
  ftp://cpan.cict.fr/pub/CPAN/
Germany
  ftp://ftp.fu-berlin.de/unix/languages/perl/
  http://mirrors.softliste.de/cpan/
  ftp://ftp.rub.de/pub/CPAN/
  http://www.planet-elektronik.de/CPAN/
  http://ftp.hosteurope.de/pub/CPAN/
  ftp://ftp.hosteurope.de/pub/CPAN/
  http://www.mirrorspace.org/cpan/
  http://mirror.netcologne.de/cpan/
  ftp://mirror.netcologne.de/cpan/
  ftp://ftp.freenet.de/pub/ftp.cpan.org/pub/CPAN/
  http://ftp-stud.hs-esslingen.de/pub/Mirrors/CPAN/
  ftp://ftp-stud.hs-esslingen.de/pub/Mirrors/CPAN/
  http://mirrors.zerg.biz/cpan/
  http://ftp.gwdg.de/pub/languages/perl/CPAN/
  ftp://ftp.gwdg.de/pub/languages/perl/CPAN/
  http://dl.ambiweb.de/mirrors/ftp.cpan.org/
  http://cpan.mirror.clusters.kg/
  http://cpan.mirror.iphh.net/
  ftp://cpan.mirror.iphh.net/pub/CPAN/
  http://cpan.mirroring.de/
  http://mirror.informatik.uni-mannheim.de/pub/mirrors/CPAN/
  ftp://mirror.informatik.uni-mannheim.de/pub/mirrors/CPAN/
  http://www.chemmedia.de/mirrors/CPAN/
  http://ftp.cw.net/pub/CPAN/
  ftp://ftp.cw.net/pub/CPAN/
  http://cpan.cpantesters.org/
  ftp://cpan.cpantesters.org/CPAN/
  http://cpan.mirrored.de/
  ftp://mirror.petamem.com/CPAN/
  http://cpan.noris.de/
  ftp://cpan.noris.de/pub/CPAN/
  ftp://ftp.mpi-sb.mpg.de/pub/perl/CPAN/
  ftp://ftp.gmd.de/mirrors/CPAN/
Greece
  ftp://ftp.forthnet.gr/pub/languages/perl/CPAN
  ftp://ftp.ntua.gr/pub/lang/perl/
  http://cpan.cc.uoc.gr/
  ftp://ftp.cc.uoc.gr/mirrors/CPAN/
Hungary
  http://cpan.mirrors.enexis.hu/
  ftp://cpan.mirrors.enexis.hu/mirrors/cpan/
  http://cpan.hu/
Iceland
  http://ftp.rhnet.is/pub/CPAN/
  ftp://ftp.rhnet.is/pub/CPAN/
Ireland
  http://ftp.esat.net/pub/languages/perl/CPAN/
  ftp://ftp.esat.net/pub/languages/perl/CPAN/
  http://ftp.heanet.ie/mirrors/ftp.perl.org/pub/CPAN
  ftp://ftp.heanet.ie/mirrors/ftp.perl.org/pub/CPAN
Italy
  http://bo.mirror.garr.it/mirrors/CPAN/
  http://cpan.panu.it/
  ftp://ftp.panu.it/pub/mirrors/perl/CPAN/
Latvia
  http://kvin.lv/pub/CPAN/
Lithuania
  http://ftp.litnet.lt/pub/CPAN/
  ftp://ftp.litnet.lt/pub/CPAN/
Malta
  http://cpan.waldonet.net.mt/
Netherlands
  ftp://ftp.quicknet.nl/pub/CPAN/
  http://mirror.hostfuss.com/CPAN/
  ftp://mirror.hostfuss.com/CPAN/
  http://mirrors3.kernel.org/cpan/
  ftp://mirrors3.kernel.org/pub/CPAN/
  http://cpan.mirror.versatel.nl/
  ftp://ftp.mirror.versatel.nl/cpan/
  ftp://download.xs4all.nl/pub/mirror/CPAN/
  http://mirror.leaseweb.com/CPAN/
  ftp://mirror.leaseweb.com/CPAN/
  ftp://ftp.cpan.nl/pub/CPAN/
  http://archive.cs.uu.nl/mirror/CPAN/
  ftp://ftp.cs.uu.nl/mirror/CPAN/
  http://luxitude.net/cpan/
Norway
  ftp://ftp.uninett.no/pub/languages/perl/CPAN
  ftp://ftp.uit.no/pub/languages/perl/cpan/
Poland
  http://piotrkosoft.net/pub/mirrors/CPAN/
  ftp://ftp.piotrkosoft.net/pub/mirrors/CPAN/
  http://ftp.man.poznan.pl/pub/CPAN
  ftp://ftp.man.poznan.pl/pub/CPAN
  ftp://ftp.ps.pl/pub/CPAN/
  ftp://sunsite.icm.edu.pl/pub/CPAN/
  ftp://ftp.tpnet.pl/d4/CPAN/
Portugal
  http://cpan.dei.uc.pt/
  ftp://ftp.dei.uc.pt/pub/CPAN
  ftp://ftp.ist.utl.pt/pub/CPAN/
  http://cpan.perl.pt/
  http://cpan.ip.pt/
  ftp://cpan.ip.pt/pub/cpan/
  http://mirrors.nfsi.pt/CPAN/
  ftp://mirrors.nfsi.pt/pub/CPAN/
  http://cpan.dcc.fc.up.pt/
Romania
  http://ftp.astral.ro/pub/CPAN/
  ftp://ftp.astral.ro/pub/CPAN/
  ftp://ftp.lug.ro/CPAN
  http://mirrors.xservers.ro/CPAN/
  http://mirrors.hostingromania.ro/ftp.cpan.org/
  ftp://ftp.hostingromania.ro/mirrors/ftp.cpan.org/
  ftp://ftp.iasi.roedu.net/pub/mirrors/ftp.cpan.org/
Russia
  ftp://ftp.aha.ru/CPAN/
  http://cpan.rinet.ru/
  ftp://cpan.rinet.ru/pub/mirror/CPAN/
  ftp://ftp.SpringDaemons.com/pub/CPAN/
  http://mirror.rol.ru/CPAN/
  http://ftp.silvernet.ru/CPAN/
  http://ftp.spbu.ru/CPAN/
  ftp://ftp.spbu.ru/CPAN/
Slovakia
  http://cpan.fyxm.net/
Slovenia
  http://www.klevze.si/cpan
Spain
  http://osl.ugr.es/CPAN/
  ftp://ftp.rediris.es/mirror/CPAN/
  http://ftp.gui.uva.es/sites/cpan.org/
  ftp://ftp.gui.uva.es/sites/cpan.org/
Sweden
  http://mirrors4.kernel.org/cpan/
  ftp://mirrors4.kernel.org/pub/CPAN/
Switzerland
  http://cpan.mirror.solnet.ch/
  ftp://ftp.solnet.ch/mirror/CPAN/
  ftp://ftp.adwired.ch/CPAN/
  http://mirror.switch.ch/ftp/mirror/CPAN/
  ftp://mirror.switch.ch/mirror/CPAN/
Ukraine
  http://cpan.makeperl.org/
  ftp://cpan.makeperl.org/pub/CPAN
  http://cpan.org.ua/
  http://cpan.gafol.net/
  ftp://ftp.gafol.net/pub/cpan/
United Kingdom
  http://www.mirrorservice.org/sites/ftp.funet.fi/pub/languages/perl/CPAN/
  ftp://ftp.mirrorservice.org/sites/ftp.funet.fi/pub/languages/perl/CPAN/
  http://mirror.tje.me.uk/pub/mirrors/ftp.cpan.org/
  ftp://mirror.tje.me.uk/pub/mirrors/ftp.cpan.org/
  http://www.mirror.8086.net/sites/CPAN/
  ftp://ftp.mirror.8086.net/sites/CPAN/
  http://cpan.mirror.anlx.net/
  ftp://ftp.mirror.anlx.net/CPAN/
  http://mirror.bytemark.co.uk/CPAN/
  ftp://mirror.bytemark.co.uk/CPAN/
  http://cpan.etla.org/
  ftp://cpan.etla.org/pub/CPAN
  ftp://ftp.demon.co.uk/pub/CPAN/
  http://mirror.sov.uk.goscomb.net/CPAN/
  ftp://mirror.sov.uk.goscomb.net/pub/CPAN/
  http://ftp.plig.net/pub/CPAN/
  ftp://ftp.plig.net/pub/CPAN/
  http://ftp.ticklers.org/pub/CPAN/
  ftp://ftp.ticklers.org/pub/CPAN/
  http://cpan.mirrors.uk2.net/
  ftp://mirrors.uk2.net/pub/CPAN/
  http://mirror.ox.ac.uk/sites/www.cpan.org/
  ftp://mirror.ox.ac.uk/sites/www.cpan.org/

North America

Bahamas
  http://www.securehost.com/mirror/CPAN/
Canada
  http://cpan.arcticnetwork.ca
  ftp://mirror.arcticnetwork.ca/pub/CPAN
  http://cpan.sunsite.ualberta.ca/
  ftp://cpan.sunsite.ualberta.ca/pub/CPAN/
  http://theoryx5.uwinnipeg.ca/pub/CPAN/
  ftp://theoryx5.uwinnipeg.ca/pub/CPAN/
  http://arwen.cs.dal.ca/mirror/CPAN/
  ftp://arwen.cs.dal.ca/pub/mirror/CPAN/
  http://CPAN.mirror.rafal.ca/
  ftp://CPAN.mirror.rafal.ca/pub/CPAN/
  ftp://ftp.nrc.ca/pub/CPAN/
  http://mirror.csclub.uwaterloo.ca/pub/CPAN/
  ftp://mirror.csclub.uwaterloo.ca/pub/CPAN/
Mexico
  http://www.msg.com.mx/CPAN/
  ftp://ftp.msg.com.mx/pub/CPAN/
United States
Alabama
  http://mirror.hiwaay.net/CPAN/
  ftp://mirror.hiwaay.net/CPAN/
Arizona
  http://cpan.ezarticleinformation.com/
California
  http://cpan.knowledgematters.net/
  http://cpan.binkerton.com/
  http://cpan.develooper.com/
  http://mirrors.gossamer-threads.com/CPAN
  http://cpan.schatt.com/
  http://mirrors.kernel.org/cpan/
  ftp://mirrors.kernel.org/pub/CPAN
  http://mirrors2.kernel.org/cpan/
  ftp://mirrors2.kernel.org/pub/CPAN/
  http://cpan.mirror.facebook.net/
  http://mirrors1.kernel.org/cpan/
  ftp://mirrors1.kernel.org/pub/CPAN/
  http://cpan-sj.viaverio.com/
  ftp://cpan-sj.viaverio.com/pub/CPAN/
  http://www.perl.com/CPAN/
Florida
  ftp://ftp.cise.ufl.edu/pub/mirrors/CPAN/
  http://mirror.atlantic.net/pub/CPAN/
  ftp://mirror.atlantic.net/pub/CPAN/
Idaho
  http://mirror.its.uidaho.edu/pub/cpan/
  ftp://mirror.its.uidaho.edu/cpan/
Illinois
  http://cpan.mirrors.hoobly.com/
  http://cpan.uchicago.edu/pub/CPAN/
  ftp://cpan.uchicago.edu/pub/CPAN/
  http://mirrors.servercentral.net/CPAN/
  http://www.stathy.com/CPAN/
  ftp://www.stathy.com/CPAN/
Indiana
  ftp://ftp.uwsg.iu.edu/pub/perl/CPAN/
  http://cpan.netnitco.net/
  ftp://cpan.netnitco.net/pub/mirrors/CPAN/
  http://ftp.ndlug.nd.edu/pub/perl/
  ftp://ftp.ndlug.nd.edu/pub/perl/
Massachusetts
  http://mirrors.ccs.neu.edu/CPAN/
Michigan
  http://ftp.wayne.edu/cpan/
  ftp://ftp.wayne.edu/cpan/
Minnesota
  http://cpan.msi.umn.edu/
New Jersey
  http://mirror.datapipe.net/CPAN/
  ftp://mirror.datapipe.net/pub/CPAN/
New York
  http://mirrors.24-7-solutions.net/pub/CPAN/
  ftp://mirrors.24-7-solutions.net/pub/CPAN/
  http://mirror.cc.columbia.edu/pub/software/cpan/
  ftp://mirror.cc.columbia.edu/pub/software/cpan/
  http://cpan.belfry.net/
  http://cpan.erlbaum.net/
  ftp://cpan.erlbaum.net/CPAN/
  http://cpan.hexten.net/
  ftp://cpan.hexten.net/
  ftp://mirror.nyi.net/CPAN/
  http://mirror.rit.edu/CPAN/
  ftp://mirror.rit.edu/CPAN/
North Carolina
  http://www.ibiblio.org/pub/mirrors/CPAN
  ftp://ftp.ncsu.edu/pub/mirror/CPAN/
Oregon
  http://ftp.osuosl.org/pub/CPAN/
  ftp://ftp.osuosl.org/pub/CPAN/
Pennsylvania
  http://ftp.epix.net/CPAN/
  ftp://ftp.epix.net/pub/languages/perl/
  http://cpan.pair.com/
  ftp://cpan.pair.com/pub/CPAN/
South Carolina
  http://cpan.mirror.clemson.edu/
Tennessee
  http://mira.sunsite.utk.edu/CPAN/
Texas
  http://mirror.uta.edu/CPAN
Utah
  ftp://mirror.xmission.com/CPAN/
Virginia
  http://cpan-du.viaverio.com/
  ftp://cpan-du.viaverio.com/pub/CPAN/
  http://perl.secsup.org/
  ftp://perl.secsup.org/pub/perl/
  ftp://mirror.cogentco.com/pub/CPAN/
Washington
  http://cpan.llarian.net/
  ftp://cpan.llarian.net/pub/CPAN/
  ftp://ftp-mirror.internap.com/pub/CPAN/
Wisconsin
  http://cpan.mirrors.tds.net
  ftp://cpan.mirrors.tds.net/pub/CPAN
  http://mirror.sit.wisc.edu/pub/CPAN/
  ftp://mirror.sit.wisc.edu/pub/CPAN/

Oceania

Australia
  http://mirror.internode.on.net/pub/cpan/
  ftp://mirror.internode.on.net/pub/cpan/
  http://cpan.mirror.aussiehq.net.au/
  http://mirror.as24220.net/cpan/
  ftp://mirror.as24220.net/cpan/
New Zealand
  ftp://ftp.auckland.ac.nz/pub/perl/CPAN/
  http://cpan.inspire.net.nz
  ftp://cpan.inspire.net.nz/cpan
  http://cpan.catalyst.net.nz/CPAN/
  ftp://cpan.catalyst.net.nz/pub/CPAN/

South America

Argentina
  http://cpan.patan.com.ar/
  http://cpan.localhost.net.ar
  ftp://mirrors.localhost.net.ar/pub/mirrors/CPAN
Brazil
  ftp://cpan.pop-mg.com.br/pub/CPAN/
  http://ftp.pucpr.br/CPAN
  ftp://ftp.pucpr.br/CPAN
  http://cpan.kinghost.net/
Chile
  http://cpan.dcc.uchile.cl/
  ftp://cpan.dcc.uchile.cl/pub/lang/cpan/
Colombia
  http://www.laqee.unal.edu.co/CPAN/

RSYNC Mirrors

                      mirror.as24220.net::cpan
                      cpan.inode.at::CPAN
                      gd.tuwien.ac.at::CPAN
                      ftp.belnet.be::packages/cpan
                      rsync.linorg.usp.br::CPAN
                      rsync.arcticnetwork.ca::CPAN
                      CPAN.mirror.rafal.ca::CPAN
                      mirror.csclub.uwaterloo.ca::CPAN
                      theoryx5.uwinnipeg.ca::CPAN
                      www.laqee.unal.edu.co::CPAN
                      mirror.uni-c.dk::CPAN
                      rsync.nic.funet.fi::CPAN
                      rsync://distrib-coffee.ipsl.jussieu.fr/pub/mirrors/cpan/
                      mir1.ovh.net::CPAN
                      miroir-francais.fr::cpan
                      ftp.crihan.fr::CPAN
                      rsync://mirror.cict.fr/cpan/
                      rsync://mirror.netcologne.de/cpan/
                      ftp-stud.hs-esslingen.de::CPAN/
                      ftp.gwdg.de::FTP/languages/perl/CPAN/
                      cpan.mirror.iphh.net::CPAN
                      cpan.cpantesters.org::cpan
                      cpan.hu::CPAN
                      komo.vlsm.org::CPAN
                      mirror.unej.ac.id::cpan
                      ftp.esat.net::/pub/languages/perl/CPAN
                      ftp.heanet.ie::mirrors/ftp.perl.org/pub/CPAN
                      rsync.panu.it::CPAN
                      cpan.fastbull.org::CPAN
                      ftp.kddilabs.jp::cpan
                      ftp.nara.wide.ad.jp::cpan/
                      rsync://ftp.jaist.ac.jp/pub/CPAN/
                      rsync://ftp.riken.jp/cpan/
                      mirror.linuxiso.kz::CPAN
                      rsync://mirrors3.kernel.org/mirrors/CPAN/
                      rsync://rsync.osmirror.nl/cpan/
                      mirror.leaseweb.com::CPAN
                      cpan.nautile.nc::CPAN
                      mirror.icis.pcz.pl::CPAN
                      piotrkosoft.net::mirrors/CPAN
                      rsync://cpan.perl.pt/
                      ftp.kaist.ac.kr::cpan
                      cpan.sarang.net::CPAN
                      mirror.averse.net::cpan
                      rsync.oss.eznetsols.org
                      mirror.ac.za::cpan
                      ftp.is.co.za::IS-Mirror/ftp.cpan.org/
                      rsync://ftp.gui.uva.es/cpan/
                      rsync://mirrors4.kernel.org/mirrors/CPAN/
                      ftp.solnet.ch::CPAN
                      ftp.ulak.net.tr::CPAN
                      gafol.net::cpan
                      rsync.mirrorservice.org::ftp.funet.fi/pub/
                      rsync://rsync.mirror.8086.net/CPAN/
                      rsync.mirror.anlx.net::CPAN
                      mirror.bytemark.co.uk::CPAN
                      ftp.plig.net::CPAN
                      rsync://ftp.ticklers.org:CPAN/
                      mirrors.ibiblio.org::CPAN
                      cpan-du.viaverio.com::CPAN
                      mirror.hiwaay.net::CPAN
                      rsync://mira.sunsite.utk.edu/CPAN/
                      cpan.mirrors.tds.net::CPAN
                      mirror.its.uidaho.edu::cpan
                      rsync://mirror.cc.columbia.edu::cpan/
                      ftp.fxcorporate.com::CPAN
                      rsync.atlantic.net::CPAN
                      mirrors.kernel.org::mirrors/CPAN
                      rsync://mirrors2.kernel.org/mirrors/CPAN/
                      cpan.pair.com::CPAN
                      rsync://mirror.rit.edu/CPAN/
                      rsync://mirror.facebook.net/cpan/
                      rsync://mirrors1.kernel.org/mirrors/CPAN/
                      cpan-sj.viaverio.com::CPAN

For an up-to-date listing of CPAN sites, see http://www.cpan.org/SITES or ftp://www.cpan.org/SITES .

Modules: Creation, Use, and Abuse ^

(The following section is borrowed directly from Tim Bunce's modules file, available at your nearest CPAN site.)

Perl implements a class using a package, but the presence of a package doesn't imply the presence of a class. A package is just a namespace. A class is a package that provides subroutines that can be used as methods. A method is just a subroutine that expects, as its first argument, either the name of a package (for "static" methods), or a reference to something (for "virtual" methods).

A module is a file that (by convention) provides a class of the same name (sans the .pm), plus an import method in that class that can be called to fetch exported symbols. This module may implement some of its methods by loading dynamic C or C++ objects, but that should be totally transparent to the user of the module. Likewise, the module might set up an AUTOLOAD function to slurp in subroutine definitions on demand, but this is also transparent. Only the .pm file is required to exist. See perlsub, perlobj, and AutoLoader for details about the AUTOLOAD mechanism.

Guidelines for Module Creation

Guidelines for Converting Perl 4 Library Scripts into Modules

Guidelines for Reusing Application Code

NOTE ^

Perl does not enforce private and public parts of its modules as you may have been used to in other languages like C++, Ada, or Modula-17. Perl doesn't have an infatuation with enforced privacy. It would prefer that you stayed out of its living room because you weren't invited, not because it has a shotgun.

The module and its user have a contract, part of which is common law, and part of which is "written". Part of the common law contract is that a module doesn't pollute any namespace it wasn't asked to. The written contract for the module (A.K.A. documentation) may make other provisions. But then you know when you use RedefineTheWorld that you're redefining the world and willing to take the consequences.

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