path perlfaq.* cpan/perlfaq/lib/
path perlglossary cpan/perlfaq/lib/
path perlxs(?:tut|typemap)? dist/ExtUtils-ParseXS/lib/
-path perldoc cpan/Pod-Perldoc/lib/
+path perldoc cpan/Pod-Perldoc/
aux a2p c2ph h2ph h2xs perlbug pl2pm pod2html pod2man s2p splain xsubpp
perlhist Perl history records
perldelta Perl changes since previous version
- perl5175delta Perl changes in version 5.17.5
- perl5174delta Perl changes in version 5.17.4
- perl5173delta Perl changes in version 5.17.3
- perl5172delta Perl changes in version 5.17.2
- perl5171delta Perl changes in version 5.17.1
- perl5170delta Perl changes in version 5.17.0
+ perl5195delta Perl changes in version 5.19.5
+ perl5194delta Perl changes in version 5.19.4
+ perl5193delta Perl changes in version 5.19.3
+ perl5192delta Perl changes in version 5.19.2
+ perl5191delta Perl changes in version 5.19.1
+ perl5190delta Perl changes in version 5.19.0
+ perl5181delta Perl changes in version 5.18.1
+ perl5180delta Perl changes in version 5.18.0
perl5161delta Perl changes in version 5.16.1
perl5162delta Perl changes in version 5.16.2
+ perl5163delta Perl changes in version 5.16.3
perl5160delta Perl changes in version 5.16.0
+ perl5144delta Perl changes in version 5.14.4
perl5143delta Perl changes in version 5.14.3
perl5142delta Perl changes in version 5.14.2
perl5141delta Perl changes in version 5.14.1
perl5140delta Perl changes in version 5.14.0
+ perl5125delta Perl changes in version 5.12.5
perl5124delta Perl changes in version 5.12.4
perl5123delta Perl changes in version 5.12.3
perl5122delta Perl changes in version 5.12.2
perlaix Perl notes for AIX
perlamiga Perl notes for AmigaOS
- perlbeos Perl notes for BeOS
perlbs2000 Perl notes for POSIX-BC BS2000
perlce Perl notes for WinCE
perlcygwin Perl notes for Cygwin
- perldgux Perl notes for DG/UX
perldos Perl notes for DOS
- perlepoc Perl notes for EPOC
perlfreebsd Perl notes for FreeBSD
perlhaiku Perl notes for Haiku
perlhpux Perl notes for HP-UX
perlriscos Perl notes for RISC OS
perlsolaris Perl notes for Solaris
perlsymbian Perl notes for Symbian
+ perlsynology Perl notes for Synology
perltru64 Perl notes for Tru64
perlvms Perl notes for VMS
perlvos Perl notes for Stratus VOS
perlboot
perlbot
+ perlrepository
perltodo
perltooc
perltoot
On a Unix-like system, these documentation files will usually also be
available as manpages for use with the F<man> program.
+Some documentation is not available as man pages, so if a
+cross-reference is not found by man, try it with L<perldoc>. Perldoc can
+also take you directly to documentation for functions (with the B<-f>
+switch). See C<perldoc --help> (or C<perldoc perldoc> or C<man perldoc>)
+for other helpful options L<perldoc> has to offer.
+
In general, if something strange has gone wrong with your program and you're
-not sure where you should look for help, try the B<-w> switch first. It will
-often point out exactly where the trouble is.
+not sure where you should look for help, try making your code comply with
+B<use strict> and B<use warnings>. These will often point out exactly
+where the trouble is.
=head1 DESCRIPTION
from quick "one-liners" to full-scale application development.
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, B<sed>, B<awk>, and B<sh>, so people familiar with
-those languages should have little difficulty with it. (Language
-historians will also note some vestiges of B<csh>, Pascal, and even
-BASIC-PLUS.) Expression syntax corresponds 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 also has many excellent tools for slicing
-and dicing binary data.
-
-But wait, there's more...
-
-Begun in 1993 (see L<perlhist>), Perl version 5 is nearly a complete
-rewrite that provides the following additional benefits:
-
-=over 4
-
-=item *
-
-modularity and reusability using innumerable modules
-
-Described in L<perlmod>, L<perlmodlib>, and L<perlmodinstall>.
-
-=item *
-
-embeddable and extensible
-
-Described in L<perlembed>, L<perlxstut>, L<perlxs>, L<perlxstypemap>,
-L<perlcall>, L<perlguts>, and L<xsubpp>.
-
-=item *
-
-roll-your-own magic variables (including multiple simultaneous DBM
-implementations)
-
-Described in L<perltie> and L<AnyDBM_File>.
-
-=item *
-
-subroutines can now be overridden, autoloaded, and prototyped
-
-Described in L<perlsub>.
-
-=item *
-
-arbitrarily nested data structures and anonymous functions
-
-Described in L<perlreftut>, L<perlref>, L<perldsc>, and L<perllol>.
-
-=item *
-
-object-oriented programming
-
-Described in L<perlobj> and L<perlootut>.
-
-=item *
-
-support for light-weight processes (threads)
-
-Described in L<perlthrtut> and L<threads>.
-
-=item *
-
-support for Unicode, internationalization, and localization
-
-Described in L<perluniintro>, L<perllocale> and L<Locale::Maketext>.
-
-=item *
-
-lexical scoping
-
-Described in L<perlsub>.
-
-=item *
-
-regular expression enhancements
-
-Described in L<perlre>, with additional examples in L<perlop>.
-
-=item *
-
-enhanced debugger and interactive Perl environment,
-with integrated editor support
-
-Described in L<perldebtut>, L<perldebug> and L<perldebguts>.
-
-=item *
-
-POSIX 1003.1 compliant library
-
-Described in L<POSIX>.
-
-=back
-
-Okay, that's I<definitely> enough hype.
+complete) rather than beautiful (tiny, elegant, minimal). It combines
+(in the author's opinion, anyway) some of the best features of B<sed>,
+B<awk>, and B<sh>, making it familiar and easy to use for Unix users to
+whip up quick solutions to annoying problems. Its general-purpose
+programming facilities support procedural, functional, and
+object-oriented programming paradigms, making Perl a comfortable
+language for the long haul on major projects, whatever your bent.
+
+Perl's roots in text processing haven't been forgotten over the years.
+It still boasts some of the most powerful regular expressions to be
+found anywhere, and its support for Unicode text is world-class. It
+handles all kinds of structured text, too, through an extensive
+collection of extensions. Those libraries, collected in the CPAN,
+provide ready-made solutions to an astounding array of problems. When
+they haven't set the standard themselves, they steal from the best
+-- just like Perl itself.
=head1 AVAILABILITY
=head1 DIAGNOSTICS
-The C<use warnings> pragma (and the B<-w> switch) produces some
-lovely diagnostics.
+Using the C<use strict> pragma ensures that all variables are properly
+declared and prevents other misuses of legacy Perl features.
+
+The C<use warnings> pragma produces some lovely diagnostics. One can
+also use the B<-w> flag, but its use is normally discouraged, because
+it gets applied to all executed Perl code, including that not under
+your control.
See L<perldiag> for explanations of all Perl's diagnostics. The C<use
diagnostics> pragma automatically turns Perl's normally terse warnings
Setuid scripts have additional constraints that can produce error
messages such as "Insecure dependency". See L<perlsec>.
-Did we mention that you should definitely consider using the B<-w>
-switch?
+Did we mention that you should definitely consider using the B<use warnings>
+pragma?
=head1 BUGS
-The B<-w> switch is not mandatory.
+The behavior implied by the B<use warnings> pragma is not mandatory.
Perl is at the mercy of your machine's definitions of various
operations such as type casting, atof(), and floating-point
https://perl5.git.perl.org / perl5.git / blobdiff