=head1 NAME

perlfaq2 - Obtaining and Learning about Perl

=head1 DESCRIPTION

This section of the FAQ answers questions about where to find
source and documentation for Perl, support, and
related matters.

=head2 What machines support Perl? Where do I get it?

The standard release of Perl (the one maintained by the Perl
development team) is distributed only in source code form. You
can find the latest releases at L<http://www.cpan.org/src/>.

Perl builds and runs on a bewildering number of platforms. Virtually
all known and current Unix derivatives are supported (perl's native
platform), as are other systems like VMS, DOS, OS/2, Windows,
QNX, BeOS, OS X, MPE/iX and the Amiga.

Binary distributions for some proprietary platforms can be found
L<http://www.cpan.org/ports/> directory. Because these are not part of
the standard distribution, they may and in fact do differ from the
base perl port in a variety of ways. You'll have to check their
respective release notes to see just what the differences are. These
differences can be either positive (e.g. extensions for the features
of the particular platform that are not supported in the source
release of perl) or negative (e.g. might be based upon a less current
source release of perl).

=head2 How can I get a binary version of Perl?

See L<CPAN Ports|http://www.cpan.org/ports/>

=head2 I don't have a C compiler. How can I build my own Perl interpreter?

For Windows, use a binary version of Perl,
L<Strawberry Perl|http://strawberryperl.com/> and
L<ActivePerl|http://www.activestate.com/activeperl> come with a
bundled C compiler.

Otherwise if you really do want to build Perl, you need to get a
binary version of C<gcc> for your system first. Use a search
engine to find out how to do this for your operating system.

=head2 I copied the Perl binary from one machine to another, but scripts don't work.

That's probably because you forgot libraries, or library paths differ.
You really should build the whole distribution on the machine it will
eventually live on, and then type C<make install>. Most other
approaches are doomed to failure.

One simple way to check that things are in the right place is to print out
the hard-coded C<@INC> that perl looks through for libraries:

    % perl -le 'print for @INC'

If this command lists any paths that don't exist on your system, then you
may need to move the appropriate libraries to these locations, or create
symbolic links, aliases, or shortcuts appropriately. C<@INC> is also printed as
part of the output of

    % perl -V

You might also want to check out
L<perlfaq8/"How do I keep my own module/library directory?">.

=head2 I grabbed the sources and tried to compile but gdbm/dynamic loading/malloc/linking/... failed. How do I make it work?

Read the F<INSTALL> file, which is part of the source distribution.
It describes in detail how to cope with most idiosyncrasies that the
C<Configure> script can't work around for any given system or
architecture.

=head2 What modules and extensions are available for Perl? What is CPAN?

CPAN stands for Comprehensive Perl Archive Network, a multi-gigabyte
archive replicated on hundreds of machines all over the world. CPAN
contains tens of thousands of modules and extensions, source code
and documentation, designed for I<everything> from commercial
database interfaces to keyboard/screen control and running large web sites.

You can search CPAN on L<http://metacpan.org> or
L<http://search.cpan.org/>.

The master web site for CPAN is L<http://www.cpan.org/>,
L<http://www.cpan.org/SITES.html> lists all mirrors.

See the CPAN FAQ at L<http://www.cpan.org/misc/cpan-faq.html> for answers
to the most frequently asked questions about CPAN.

The L<Task::Kensho> module has a list of recommended modules which
you should review as a good starting point.

=head2 Where can I get information on Perl?

=over 4

=item * L<http://www.perl.org/>

=item * L<http://perldoc.perl.org/>

=item * L<http://learn.perl.org/>

=back

The complete Perl documentation is available with the Perl distribution.
If you have Perl installed locally, you probably have the documentation
installed as well: type C<perldoc perl> in a terminal or
L<view online|http://perldoc.perl.org/perl.html>.

(Some operating system distributions may ship the documentation in a different
package; for instance, on Debian, you need to install the C<perl-doc> package.)

Many good books have been written about Perl--see the section later in
L<perlfaq2> for more details.

=head2 What is perl.com? Perl Mongers? pm.org? perl.org? cpan.org?

L<Perl.com|http://www.perl.com/> used to be part of the O'Reilly
Network, a subsidiary of O'Reilly Media. Although it retains most of
the original content from its O'Reilly Network, it is now hosted by
L<The Perl Foundation|http://www.perlfoundation.org/>.

The Perl Foundation is an advocacy organization for the Perl language
which maintains the web site L<http://www.perl.org/> as a general
advocacy site for the Perl language. It uses the domain to provide
general support services to the Perl community, including the hosting
of mailing lists, web sites, and other services. There are also many
other sub-domains for special topics like learning Perl and jobs in Perl,
such as:

=over 4

=item * L<http://www.perl.org/>

=item * L<http://learn.perl.org/>

=item * L<http://jobs.perl.org/>

=item * L<http://lists.perl.org/>

=back

L<Perl Mongers|http://www.pm.org/> uses the pm.org domain for services
related to local Perl user groups, including the hosting of mailing lists
and web sites. See the L<Perl Mongers web site|http://www.pm.org/> for more
information about joining, starting, or requesting services for a
Perl user group.

CPAN, or the Comprehensive Perl Archive Network L<http://www.cpan.org/>,
is a replicated, worldwide repository of Perl software.
See L<What is CPAN?|/"What modules and extensions are available for Perl? What is CPAN?">.

=head2 Where can I post questions?

There are many Perl L<mailing lists|lists.perl.org> for various
topics, specifically the L<beginners list|http://lists.perl.org/list/beginners.html>
may be of use.

Other places to ask questions are on the
L<PerlMonks site|http://www.perlmonks.org/> or
L<stackoverflow|http://stackoverflow.com/questions/tagged/perl>.

=head2 Perl Books

There are many good L<books on Perl|http://www.perl.org/books/library.html>.

=head2 Which magazines have Perl content?

There's also I<$foo Magazin>, a German magazine dedicated to Perl, at
( L<http://www.foo-magazin.de> ). The I<Perl-Zeitung> is another
German-speaking magazine for Perl beginners (see
L<http://perl-zeitung.at.tf> ).

Several unix/linux releated magazines frequently includes articles on Perl.

=head2 Which Perl blogs should I read?

L<Perl News|http://perlnews.org/> covers some of the major events in the Perl
world, L<Perl Weekly|http://perlweekly.com/> is a weekly e-mail
(and RSS feed) of hand-picked Perl articles.

L<http://blogs.perl.org/> hosts many Perl blogs, there are also
several blog aggregators: L<Perlsphere|http://perlsphere.net/> and
L<IronMan|http://ironman.enlightenedperl.org/> are two of them.

=head2 What mailing lists are there for Perl?

A comprehensive list of Perl-related mailing lists can be found at
L<http://lists.perl.org/>

=head2 Where can I buy a commercial version of Perl?

Perl already I<is> commercial software: it has a license
that you can grab and carefully read to your manager. It is distributed
in releases and comes in well-defined packages. There is a very large
and supportive user community and an extensive literature.

If you still need commercial support
L<ActiveState|http://www.activestate.com/activeperl> offers
this.

=head2 Where do I send bug reports?

(contributed by brian d foy)

First, ensure that you've found an actual bug. Second, ensure you've
found an actual bug.

If you've found a bug with the perl interpreter or one of the modules
in the standard library (those that come with Perl), you can use the
L<perlbug> utility that comes with Perl (>= 5.004). It collects
information about your installation to include with your message, then
sends the message to the right place.

To determine if a module came with your version of Perl, you can
install and use the L<Module::CoreList> module. It has the information
about the modules (with their versions) included with each release
of Perl.

Every CPAN module has a bug tracker set up in RT, L<http://rt.cpan.org>.
You can submit bugs to RT either through its web interface or by
email. To email a bug report, send it to
bug-E<lt>distribution-nameE<gt>@rt.cpan.org . For example, if you
wanted to report a bug in L<Business::ISBN>, you could send a message to
bug-Business-ISBN@rt.cpan.org .

Some modules might have special reporting requirements, such as a
Github or Google Code tracking system, so you should check the
module documentation too.

=head1 AUTHOR AND COPYRIGHT

Copyright (c) 1997-2010 Tom Christiansen, Nathan Torkington, and
other authors as noted. All rights reserved.

This documentation is free; you can redistribute it and/or modify it
under the same terms as Perl itself.

Irrespective of its distribution, all code examples here are in the public
domain. You are permitted and encouraged to use this code and any
derivatives thereof in your own programs for fun or for profit as you
see fit. A simple comment in the code giving credit to the FAQ would
be courteous but is not required.