perlfork – Perl’s fork() emulation Synopsis NOTE: As of the 5.8.0 release, fork() emulation has considerably matured. However, there are still a few known bugs and differences from real fork() that might affect you. See the "BUGS" and "CAVEATS AND LIMITATIONS" sections below.Perl provides a fork() keyword that corresponds to the Unix system call of…
perlfilter – Source Filters DescriptionThis article is about a little-known feature of Perl called source filters. Source filters alter the program text of a module before Perl sees it, much as a C preprocessor alters the source text of a C program before the compiler sees it. This article tells you more about what source…
perlfaq9 – Web, Email and Networking Versionversion 5.20190126 DescriptionThis section deals with questions related to running web sites, sending and receiving email as well as general networking. Should I use a web framework?Yes. If you are building a web site with any level of interactivity (forms / users / databases), you will want to use…
perlfaq8 – System Interaction Versionversion 5.20190126 DescriptionThis section of the Perl FAQ covers questions involving operating system interaction. Topics include interprocess communication (IPC), control over the user-interface (keyboard, screen and pointing devices), and most anything else not related to data manipulation. Read the FAQs and documentation specific to the port of perl to your operating…
perlfaq7 – General Perl Language Issues Versionversion 5.20190126 DescriptionThis section deals with general Perl language issues that don’t clearly fit into any of the other sections. Can I get a BNF/yacc/RE for the Perl language?There is no BNF, but you can paw your way through the yacc grammar in perly.y in the source distribution if…
perlfaq6 – Regular Expressions Versionversion 5.20190126 DescriptionThis section is surprisingly small because the rest of the FAQ is littered with answers involving regular expressions. For example, decoding a URL and checking whether something is a number can be handled with regular expressions, but those answers are found elsewhere in this document (in perlfaq9: “How do…
perlfaq5 – Files and Formats Versionversion 5.20190126 DescriptionThis section deals with I/O and the “f” issues: filehandles, flushing, formats, and footers. How do I flush/unbuffer an output filehandle? Why must I do this?(contributed by brian d foy) You might like to read Mark Jason Dominus’s “Suffering From Buffering” at <http://perl.plover.com/FAQs/Buffering.html> . Perl normally buffers output…
perlfaq4 – Data Manipulation Versionversion 5.20190126 DescriptionThis section of the FAQ answers questions related to manipulating numbers, dates, strings, arrays, hashes, and miscellaneous data issues. Data: NumbersWhy am I getting long decimals (eg, 19.9499999999999) instead of the numbers I should be getting (eg, 19.95)?For the long explanation, see David Goldberg’s “What Every Computer Scientist Should…
perlfaq3 – Programming Tools Versionversion 5.20190126 DescriptionThis section of the FAQ answers questions related to programmer tools and programming support. How do I do (anything)?Have you looked at CPAN (see perlfaq2)? The chances are that someone has already written a module that can solve your problem. Have you read the appropriate manpages? Here’s a brief…
perlfaq2 – Obtaining and Learning about Perl Versionversion 5.20190126 DescriptionThis section of the FAQ answers questions about where to find source and documentation for Perl, support, and related matters. 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…
perlfaq1 – General Questions About Perl Versionversion 5.20190126 DescriptionThis section of the FAQ answers very general, high-level questions about Perl. What is Perl?Perl is a high-level programming language with an eclectic heritage written by Larry Wall and a cast of thousands. Perl’s process, file, and text manipulation facilities make it particularly well-suited for tasks involving…
perlfaq – Frequently asked questions about Perl Versionversion 5.20190126 DescriptionThe perlfaq comprises several documents that answer the most commonly asked questions about Perl and Perl programming. It’s divided by topic into nine major sections outlined in this document. Where to find the perlfaqThe perlfaq is an evolving document. Read the latest version at <http://learn.perl.org/faq/>. It…
tetris – A tetris game Synopsisperl tetris.pl ConfigurationThe configuration file should be the file with name “.tetris” under HOME directory. Another option is using Tetris/Config.pm in any directory of @INC. Here is an example of configuration: # -*- perl -*- %Config = ( %Config, ‘start_level’ => 3, ‘down_step’ => 2, ‘keybindings’ => { %{$Config{keybindings}}, ord(‘j’) => \&move_left, ord(‘l’) => \&move_right, ord(‘k’) => \&rotate, ord(‘n’) => \&new_game, } ); push @$shapes, shape_from_string(<<SHAPE); 0 0…
tetris – A tetris game Synopsisperl tetris.pl ConfigurationThe configuration file should be the file with name “.tetris” under HOME directory. Another option is using Tetris/Config.pm in any directory of @INC. Here is an example of configuration: # -*- perl -*- %Config = ( %Config, ‘start_level’ => 3, ‘down_step’ => 2, ‘keybindings’ => { %{$Config{keybindings}}, ord(‘j’) => \&move_left, ord(‘l’) => \&move_right, ord(‘k’) => \&rotate, ord(‘n’) => \&new_game, } ); push @$shapes, shape_from_string(<<SHAPE); 0 0…
perlexperiment – A listing of experimental features in Perl DescriptionThis document lists the current and past experimental features in the perl core. Although all of these are documented with their appropriate topics, this succinct listing gives you an overview and basic facts about their status. So far we’ve merely tried to find and list the…
perlepoc – Perl for EPOC SynopsisPerl 5 README file for the EPOC Release 5 operating system. IntroductionEPOC is an OS for palmtops and mobile phones. For more information look at: <http://www.symbian.com/> This is a port of perl to the epocemx SDK by Eberhard Mattes, which itself uses the SDK by symbian. Essentially epocemx it is…
perlembed – how to embed perl in your C program DescriptionPREAMBLEDo you want to: Use C from Perl? Read perlxstut, perlxs, h2xs, perlguts, and perlapi. Use a Unix program from Perl? Read about back-quotes and about "system" and "exec" in perlfunc. Use Perl from Perl? Read about “do” in perlfunc and “eval” in perlfunc and…
perlebcdic – Considerations for running Perl on EBCDIC platforms DescriptionAn exploration of some of the issues facing Perl programmers on EBCDIC based computers. Portions of this document that are still incomplete are marked with XXX. Early Perl versions worked on some EBCDIC machines, but the last known version that ran on EBCDIC was v5.8.7, until…
perldtrace – Perl’s support for DTrace Synopsis # dtrace -Zn ‘perl::sub-entry, perl::sub-return { trace(copyinstr(arg0)) }’ dtrace: description ‘perl::sub-entry, perl::sub-return ‘ matched 10 probes # perl -E ‘sub outer { inner(@_) } sub inner { say shift } outer("hello")’ hello (dtrace output) CPU ID FUNCTION:NAME 0 75915 Perl_pp_entersub:sub-entry BEGIN 0 75915 Perl_pp_entersub:sub-entry import 0 75922 Perl_pp_leavesub:sub-return…
perldsc – Perl Data Structures Cookbook DescriptionPerl lets us have complex data structures. You can write something like this and all of a sudden, you’d have an array with three dimensions! for my $x (1 .. 10) { for my $y (1 .. 10) { for my $z (1 .. 10) { $AoA[$x][$y][$z] = $x…