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authorLarry Wall <lwall@scalpel.netlabs.com>1995-11-21 10:01:00 +1200
committerLarry <lwall@scalpel.netlabs.com>1995-11-21 10:01:00 +1200
commit4633a7c4bad06b471d9310620b7fe8ddd158cccd (patch)
tree37ebeb26a64f123784fd8fac6243b124767243b0 /pod/perlmod.pod
parent8e07c86ebc651fe92eb7e3b25f801f57cfb8dd6f (diff)
downloadperl-4633a7c4bad06b471d9310620b7fe8ddd158cccd.tar.gz
5.002 beta 1
If you're adventurous, have a look at ftp://ftp.sems.com/pub/outgoing/perl5.0/perl5.002beta1.tar.gz Many thanks to Andy for doing the integration. Obviously, if you consult the bugs database, you'll note there are still plenty of buglets that need fixing, and several enhancements that I've intended to put in still haven't made it in (Hi, Tim and Ilya). But I think it'll be pretty stable. And you can start to fiddle around with prototypes (which are, of course, still totally undocumented). Packrats, don't worry too much about readvertising this widely. Nowadays we're on a T1 here, so our bandwidth is okay. Have the appropriate amount of jollity. Larry
Diffstat (limited to 'pod/perlmod.pod')
-rw-r--r--pod/perlmod.pod280
1 files changed, 146 insertions, 134 deletions
diff --git a/pod/perlmod.pod b/pod/perlmod.pod
index d557e68ff7..c5ab08a07c 100644
--- a/pod/perlmod.pod
+++ b/pod/perlmod.pod
@@ -66,7 +66,7 @@ name is thus C<%main::>, or C<%::> for short. Likewise the nested package
mentioned earlier is named C<%OUTER::INNER::>.
The value in each entry of the associative array is what you are
-referring to when you use the C<*name> notation. In fact, the following
+referring to when you use the C<*name> typeglob notation. In fact, the following
have the same effect, though the first is more efficient because it
does the symbol table lookups at compile time:
@@ -108,7 +108,7 @@ Note that even though the subroutine is compiled in package C<dumpvar>,
the name of the subroutine is qualified so that its name is inserted
into package C<main>.
-Assignment to a symbol table entry performs an aliasing operation,
+Assignment to a typeglob performs an aliasing operation,
i.e.,
*dick = *richard;
@@ -149,16 +149,16 @@ and C<END> work just as they do in B<awk>, as a degenerate case.
=head2 Perl Classes
-There is no special class syntax in Perl 5, but a package may function
+There is no special class syntax in Perl, but a package may function
as a class if it provides subroutines that function as methods. Such a
package may also derive some of its methods from another class package
-by listing the other package name in its @ISA array. For more on
-this, see L<perlobj>.
+by listing the other package name in its @ISA array.
+
+For more on this, see L<perlobj>.
=head2 Perl Modules
-In Perl 5, the notion of packages has been extended into the notion of
-modules. A module is a package that is defined in a library file of
+A module is a just package that is defined in a library file of
the same name, and is designed to be reusable. It may do this by
providing a mechanism for exporting some of its symbols into the symbol
table of any package using it. Or it may function as a class
@@ -166,7 +166,21 @@ definition and make its semantics available implicitly through method
calls on the class and its objects, without explicit exportation of any
symbols. Or it can do a little of both.
-Perl modules are included by saying
+For example, to start a normal module called Fred, create
+a file called Fred.pm and put this at the start of it:
+
+ package Fred;
+ require Exporter;
+ @ISA = qw(Exporter);
+ @EXPORT = qw(func1 func2);
+ @EXPORT_OK = qw($sally @listabob %harry func3);
+
+Then go on to declare and use your variables in functions
+without any qualifications.
+See L<Exporter> and the I<Perl Modules File> for details on
+mechanics and style issues in module creation.
+
+Perl modules are included into your program by saying
use Module;
@@ -269,206 +283,204 @@ The following programs are defined (and have their own documentation).
=over 12
+=item C<diagnostics>
+
+Pragma to produce enhanced diagnostics
+
=item C<integer>
-Perl pragma to compute arithmetic in integer instead of double
+Pragma to compute arithmetic in integer instead of double
=item C<less>
-Perl pragma to request less of something from the compiler
+Pragma to request less of something from the compiler
=item C<sigtrap>
-Perl pragma to enable stack backtrace on unexpected signals
+Pragma to enable stack backtrace on unexpected signals
=item C<strict>
-Perl pragma to restrict unsafe constructs
+Pragma to restrict unsafe constructs
=item C<subs>
-Perl pragma to predeclare sub names
+Pragma to predeclare sub names
=back
=head2 Standard Modules
-The following modules are all expected to behave in a well-defined
+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.
-
-=over 12
-
-=item C<Abbrev>
-
-create an abbreviation table from a list
-
-=item C<AnyDBM_File>
-
-provide framework for multiple DBMs
-
-=item C<AutoLoader>
-
-load functions only on demand
-
-=item C<AutoSplit>
-
-split a package for autoloading
-
-=item C<Basename>
-
-parse file name and path from a specification
-
-=item C<Benchmark>
-
-benchmark running times of code
-
-=item C<Carp>
-
-warn or die of errors (from perspective of caller)
+Exporter module. See their own documentation for details.
-=item C<CheckTree>
+To find out all the modules installed on your system, do this:
-run many filetest checks on a tree
+ find `perl -e 'print "@INC"'` -name '*.pm' -print
-=item C<Collate>
+They should all have their own documentation installed and accessible via
+your system man(1) command. If that fails, try the I<perldoc> program.
-compare 8-bit scalar data according to the current locale
-
-=item C<Config>
-
-access Perl configuration option
+=head2 Extension Modules
-=item C<Cwd>
+Extension modules are written in C (or a mix of Perl and C) and get
+dynamically loaded into Perl if and when you need them. Supported
+extension modules include the Socket, Fcntl, and POSIX modules.
-get pathname of current working directory
+Many popular C extension modules
+do not come bundled (at least, not completely)
+due to their size, 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 in archie(1L), the Perl
+FAQ or Meta-FAQ, the WWW page, and even with their authors before randomly
+posting asking for their present condition and disposition.
-=item C<DynaLoader>
+=head2 CPAN
-Dynamically load C libraries into Perl code
+CPAN stands for the Comprehensive Perl Archive Network. This is a globally
+replicated collection of all known Perl materials, including hundreds
+of unbunded modules. Here are the major categories of modules:
-=item C<English>
+=over
-use nice English (or B<awk>) names for ugly punctuation variables
+=item *
+Language Extensions and Documentation Tools
-=item C<Env>
+=item *
+Development Support
-Perl module that imports environment variables
+=item *
+Operating System Interfaces
-=item C<Exporter>
+=item *
+Networking, Device Control (modems) and InterProcess Communication
-module to control namespace manipulations
+=item *
+Data Types and Data Type Utilities
-=item C<Fcntl>
+=item *
+Database Interfaces
-load the C Fcntl.h defines
+=item *
+User Interfaces
-=item C<FileHandle>
+=item *
+Interfaces to / Emulations of Other Programming Languages
-supply object methods for filehandles
+=item *
+File Names, File Systems and File Locking (see also File Handles)
-=item C<Find>
+=item *
+String Processing, Language Text Processing, Parsing and Searching
-traverse a file tree
+=item *
+Option, Argument, Parameter and Configuration File Processing
-=item C<Finddepth>
+=item *
+Internationalization and Locale
-traverse a directory structure depth-first
+=item *
+Authentication, Security and Encryption
-=item C<Getopt>
+=item *
+World Wide Web, HTML, HTTP, CGI, MIME
-basic and extended getopt(3) processing
+=item *
+Server and Daemon Utilities
-=item C<MakeMaker>
+=item *
+Archiving and Compression
-generate a Makefile for Perl extension
+=item *
+Images, Pixmap and Bitmap Manipulation, Drawing and Graphing
-=item C<Open2>
+=item *
+Mail and Usenet News
-open a process for both reading and writing
+=item *
+Control Flow Utilities (callbacks and exceptions etc)
-=item C<Open3>
+=item *
+File Handle and Input/Output Stream Utilities
-open a process for reading, writing, and error handling
+=item *
+Miscellaneous Modules
-=item C<POSIX>
+=back
-Perl interface to IEEE 1003.1 namespace
+Some of the reguster CPAN sites as of this writing include the following.
+You should try to choose one close to you:
-=item C<Ping>
+=over
-check a host for upness
+=item *
+ftp://ftp.sterling.com/programming/languages/perl/
-=item C<Socket>
+=item *
+ftp://ftp.sedl.org/pub/mirrors/CPAN/
-load the C socket.h defines
+=item *
+ftp://ftp.uoknor.edu/mirrors/CPAN/
-=back
+=item *
+ftp://ftp.delphi.com/pub/mirrors/packages/perl/CPAN/
-=head2 Extension Modules
+=item *
+ftp://uiarchive.cso.uiuc.edu/pub/lang/perl/CPAN/
-Extension modules are written in C (or a mix of Perl and C) and get
-dynamically loaded into Perl if and when you need them. Supported
-extension modules include the Socket, Fcntl, and POSIX modules.
+=item *
+ftp://ftp.cis.ufl.edu/pub/perl/CPAN/
-The following are popular C extension modules, which while available at
-Perl 5.0 release time, do not come bundled (at least, not completely)
-due to their size, 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 in archie(1L), the Perl
-FAQ or Meta-FAQ, the WWW page, and even with their authors before randomly
-posting asking for their present condition and disposition. There's no
-guarantee that the names or addresses below have not changed since printing,
-and in fact, they probably have!
+=item *
+ftp://ftp.switch.ch/mirror/CPAN/
-=over 12
+=item *
+ftp://ftp.sunet.se/pub/lang/perl/CPAN/
-=item C<Curses>
+=item *
+ftp://ftp.ci.uminho.pt/pub/lang/perl/
-Written by William Setzer <F<William_Setzer@ncsu.edu>>, while not
-included with the standard distribution, this extension module ports to
-most systems. FTP from your nearest Perl archive site, or try
+=item *
+ftp://ftp.cs.ruu.nl/pub/PERL/CPAN/
- ftp://ftp.ncsu.edu/pub/math/wsetzer/cursperl5??.tar.gz
+=item *
+ftp://ftp.demon.co.uk/pub/mirrors/perl/CPAN/
-It is currently in alpha test, so the name and ftp location may
-change.
+=item *
+ftp://ftp.rz.ruhr-uni-bochum.de/pub/programming/languages/perl/CPAN/
+=item *
+ftp://ftp.leo.org/pub/comp/programming/languages/perl/CPAN/
-=item C<DBI>
+=item *
+ftp://ftp.pasteur.fr/pub/computing/unix/perl/CPAN/
-This is the portable database interface written by
-<F<Tim.Bunce@ig.co.uk>>. This supersedes the many perl4 ports for
-database extensions. The official archive for DBperl extensions is
-F<ftp.demon.co.uk:/pub/perl/db>. This archive contains copies of perl4
-ports for Ingres, Oracle, Sybase, Informix, Unify, Postgres, and
-Interbase, as well as rdb and shql and other non-SQL systems.
+=item *
+ftp://ftp.ibp.fr/pub/perl/CPAN/
-=item C<DB_File>
+=item *
+ftp://ftp.funet.fi/pub/languages/perl/CPAN/
-Fastest and most restriction-free of the DBM bindings, this extension module
-uses the popular Berkeley DB to tie() into your hashes. This has a
-standardly-distributed man page and dynamic loading extension module, but
-you'll have to fetch the Berkeley code yourself. See L<DB_File> for
-where.
+=item *
+ftp://ftp.tekotago.ac.nz/pub/perl/CPAN/
-=item C<Sx>
+=item *
+ftp://ftp.mame.mu.oz.au/pub/perl/CPAN/
-This extension module is a front to the Athena and Xlib libraries for Perl
-GUI programming, originally written by by Dominic Giampaolo
-<F<dbg@sgi.com>>, then and rewritten for Sx by FrE<eacute>dE<eacute>ric
-Chauveau <F<fmc@pasteur.fr>>. It's available for FTP from
+=item *
+ftp://coombs.anu.edu.au/pub/perl/
- ftp.pasteur.fr:/pub/Perl/Sx.tar.gz
+=item *
+ftp://dongpo.math.ncu.edu.tw/perl/CPAN/
-=item C<Tk>
+=item *
+ftp://ftp.lab.kdd.co.jp/lang/perl/CPAN/
-This extension module is an object-oriented Perl5 binding to the popular
-tcl/tk X11 package. However, you need know no TCL to use it!
-It was written by Malcolm Beattie <F<mbeattie@sable.ox.ac.uk>>.
-If you are unable to locate it using archie(1L) or a similar
-tool, you may try retrieving it from F</private/Tk-october.tar.gz>
-from Malcolm's machine listed above.
+=item *
+ftp://ftp.is.co.za/programming/perl/CPAN/
=back
+
+For an up-to-date listing of CPAN sites,
+see http://www.perl.com/perl/ or ftp://ftp.perl.com/perl/.