=head1 NAME
-perlfaq1 - General Questions About Perl ($Revision: 1.23 $, $Date: 1999/05/23 16:08:30 $)
+perlfaq1 - General Questions About Perl ($Revision: 1.14 $, $Date: 2003/11/23 08:02:29 $)
=head1 DESCRIPTION
for Perl's milestone releases.
In particular, the core development team (known as the Perl Porters)
-are a rag-tag band of highly altruistic individuals committed
-to producing better software for free than you could hope to
-purchase for money. You may snoop on pending developments via
-nntp://news.perl.com/perl.porters-gw/ and the Deja archive at
-http://www.deja.com/ using the perl.porters-gw newsgroup, or you can
-subscribe to the mailing list by sending perl5-porters-request@perl.org
-a subscription request.
+are a rag-tag band of highly altruistic individuals committed to
+producing better software for free than you could hope to purchase for
+money. You may snoop on pending developments via the archives at
+http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/
+and http://archive.develooper.com/perl5-porters@perl.org/
+or the news gateway nntp://nntp.perl.org/perl.perl5.porters or
+its web interface at http://nntp.perl.org/group/perl.perl5.porters ,
+or read the faq at http://simon-cozens.org/writings/p5p-faq ,
+or you can subscribe to the mailing list by sending
+perl5-porters-request@perl.org a subscription request
+(an empty message with no subject is fine).
While the GNU project includes Perl in its distributions, there's no
such thing as "GNU Perl". Perl is not produced nor maintained by the
You should definitely use version 5. Version 4 is old, limited, and
no longer maintained; its last patch (4.036) was in 1992, long ago and
far away. Sure, it's stable, but so is anything that's dead; in fact,
-perl4 had been called a dead, flea-bitten camel carcass. The most recent
-production release is 5.6 (although 5.005_03 is still supported).
-The most cutting-edge development release is 5.7. Further references
-to the Perl language in this document refer to the production release
-unless otherwise specified. There may be one or more official bug fixes
-by the time you read this, and also perhaps some experimental versions
-on the way to the next release. All releases prior to 5.004 were subject
-to buffer overruns, a grave security issue.
+perl4 had been called a dead, flea-bitten camel carcass. The most
+recent production release is 5.8.2 (although 5.005_03 and 5.6.2 are
+still supported). The most cutting-edge development release is 5.9.
+Further references to the Perl language in this document refer to the
+production release unless otherwise specified. There may be one or
+more official bug fixes by the time you read this, and also perhaps
+some experimental versions on the way to the next release.
+All releases prior to 5.004 were subject to buffer overruns, a grave
+security issue.
=head2 What are perl4 and perl5?
perl source code from releases 1 through 4. It has been modularized,
object-oriented, tweaked, trimmed, and optimized until it almost doesn't
look like the old code. However, the interface is mostly the same, and
-compatibility with previous releases is very high.
+compatibility with previous releases is very high.
See L<perltrap/"Perl4 to Perl5 Traps">.
To avoid the "what language is perl5?" confusion, some people prefer to
See L<perlhist> for a history of Perl revisions.
+=head2 What is Ponie?
+
+At The O'Reilly Open Source Software Convention in 2003, Artur
+Bergman, Fotango, and The Perl Foundation announced a project to
+run perl5 on the Parrot virtual machine named Ponie. Ponie stands for
+Perl On New Internal Engine. The Perl 5.10 language implementation
+will be used for Ponie, and there will be no language level
+differences between perl5 and ponie. Ponie is not a complete rewrite
+of perl5.
+
+For more details, see http://www.poniecode.org/
+
=head2 What is perl6?
-At The Second O'Reilly Open Source Software Convention, Larry Wall
+At The Second O'Reilly Open Source Software Convention, Larry Wall
announced Perl6 development would begin in earnest. Perl6 was an oft
used term for Chip Salzenberg's project to rewrite Perl in C++ named
-Topaz. However, Topaz should not be confused with the nisus to rewrite
-Perl while keeping the lessons learned from other software, as well as
-Perl5, in mind.
+Topaz. However, Topaz provided valuable insights to the next version
+of Perl and its implementation, but was ultimately abandoned.
-If you have a desire to help in the crusade to make Perl a better place
-then peruse the Perl6 developers page at http://www.perl.org/perl6/ and
-get involved.
+If you want to learn more about Perl6, or have a desire to help in
+the crusade to make Perl a better place then peruse the Perl6 developers
+page at http://dev.perl.org/perl6/ and get involved.
-The first alpha release is expected by Summer 2001.
+Perl6 is not scheduled for release yet, and Perl5 will still be supported
+for quite awhile after its release. Do not wait for Perl6 to do whatever
+you need to do.
"We're really serious about reinventing everything that needs reinventing."
--Larry Wall
can parse Perl." You may or may not choose to follow this usage. For
example, parallelism means "awk and perl" and "Python and Perl" look
OK, while "awk and Perl" and "Python and perl" do not. But never
-write "PERL", because perl isn't really an acronym, apocryphal
+write "PERL", because perl is not an acronym, apocryphal
folklore and post-facto expansions notwithstanding.
=head2 Is it a Perl program or a Perl script?
These are the "just another perl hacker" signatures that some people
sign their postings with. Randal Schwartz made these famous. About
100 of the earlier ones are available from
-http://www.perl.com/CPAN/misc/japh .
+http://www.cpan.org/misc/japh .
=head2 Where can I get a list of Larry Wall witticisms?
Over a hundred quips by Larry, from postings of his or source code,
-can be found at http://www.perl.com/CPAN/misc/lwall-quotes.txt.gz .
+can be found at http://www.cpan.org/misc/lwall-quotes.txt.gz .
-Newer examples can be found by perusing Larry's postings:
-
- http://x1.dejanews.com/dnquery.xp?QRY=*&DBS=2&ST=PS&defaultOp=AND&LNG=ALL&format=terse&showsort=date&maxhits=100&subjects=&groups=&authors=larry@*wall.org&fromdate=&todate=
-
-=head2 How can I convince my sysadmin/supervisor/employees to use version 5/5.005/Perl instead of some other language?
+=head2 How can I convince my sysadmin/supervisor/employees to use version 5/5.6.1/Perl instead of some other language?
If your manager or employees are wary of unsupported software, or
software which doesn't officially ship with your operating system, you
number of modules and extensions which greatly reduce development time
for any given task. Also mention that the difference between version
4 and version 5 of Perl is like the difference between awk and C++.
-(Well, OK, maybe it's not quite that distinct, but you get the idea.) If you
-want support and a reasonable guarantee that what you're developing
-will continue to work in the future, then you have to run the supported
-version. That probably means running the 5.005 release, although 5.004
-isn't that bad. Several important bugs were fixed from the 5.000 through
-5.003 versions, though, so try upgrading past them if possible.
+(Well, OK, maybe it's not quite that distinct, but you get the idea.)
+If you want support and a reasonable guarantee that what you're
+developing will continue to work in the future, then you have to run
+the supported version. As of December 2003 that means running either
+5.8.2 (released in November 2003), or one of the older releases like
+5.6.2 (also released in November 2003; a maintenance release to let perl
+5.6 compile on newer systems as 5.6.1 was released in April 2001) or
+5.005_03 (released in March 1999),
+although 5.004_05 isn't that bad if you B<absolutely> need such an old
+version (released in April 1999) for stability reasons.
+Anything older than 5.004_05 shouldn't be used.
Of particular note is the massive bug hunt for buffer overflow
problems that went into the 5.004 release. All releases prior to
that, including perl4, are considered insecure and should be upgraded
as soon as possible.
+In August 2000 in all Linux distributions a new security problem was
+found in the optional 'suidperl' (not built or installed by default)
+in all the Perl branches 5.6, 5.005, and 5.004, see
+http://www.cpan.org/src/5.0/sperl-2000-08-05/
+Perl maintenance releases 5.6.1 and 5.8.0 have this security hole closed.
+Most, if not all, Linux distribution have patches for this
+vulnerability available, see http://www.linuxsecurity.com/advisories/ ,
+but the most recommendable way is to upgrade to at least Perl 5.6.1.
+
=head1 AUTHOR AND COPYRIGHT
-Copyright (c) 1997, 1998, 1999 Tom Christiansen and Nathan Torkington.
-All rights reserved.
+Copyright (c) 1997, 1998, 1999, 2000, 2001 Tom Christiansen and Nathan
+Torkington. All rights reserved.
-When included as an integrated part of the Standard Distribution
-of Perl or of its documentation (printed or otherwise), this works is
-covered under Perl's Artistic Licence. For separate distributions of
-all or part of this FAQ outside of that, see L<perlfaq>.
+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
projects / p5sagit/p5-mst-13.2.git / blobdiff