|PERLDOC(1)||Perl Programmers Reference Guide||PERLDOC(1)|
perldoc - Look up Perl documentation in Pod format.
perldoc [-h] [-D] [-t] [-u] [-m] [-l] [-U] [-F] [-i] [-V] [-T] [-r] [-d destination_file] [-o formatname] [-M FormatterClassName] [-w formatteroption:value] [-n nroff-replacement] [-X] [-L language_code] PageName|ModuleName|ProgramName|URL
perldoc -f BuiltinFunction perldoc -L it -f BuiltinFunction perldoc -q FAQ Keyword perldoc -L fr -q FAQ Keyword perldoc -v PerlVariable perldoc -a PerlAPI
See below for more description of the switches.
perldoc looks up documentation in .pod format that is embedded in the perl installation tree or in a perl script, and displays it using a variety of formatters. This is primarily used for the documentation for the perl library modules.
Your system may also have man pages installed for those modules, in which case you can probably just use the man(1) command.
If you are looking for a table of contents to the Perl library modules documentation, see the perltoc page.
NOTE: Please see the heading SECURITY below for more information.
perldoc -f sprintf
perldoc -q shuffle
perldoc -a newHV
perldoc -v '$"' perldoc -v @+ perldoc -v DATA
For example, "-oLaTeX" currently tries all of the following classes: Pod::Perldoc::ToLaTeX Pod::Perldoc::Tolatex Pod::Perldoc::ToLatex Pod::Perldoc::ToLATEX Pod::Simple::LaTeX Pod::Simple::latex Pod::Simple::Latex Pod::Simple::LATEX Pod::LaTeX Pod::latex Pod::Latex Pod::LATEX.
You can specify several classes to try by joining them with commas or semicolons, as in "-MTk::SuperPod;Tk::Pod".
You can use "-w optionname" (without a value) as shorthand for "-w optionname:TRUE". This is presumably useful in cases of on/off features like: "-w page_numbering".
You can use an "=" instead of the ":", as in: "-w textsize=15". This might be more (or less) convenient, depending on what shell you use.
For simple names like 'foo', when the normal search fails to find a matching page, a search with the "perl" prefix is tried as well. So "perldoc intro" is enough to find/render "perlintro.pod".
Because perldoc does not run properly tainted, and is known to have security issues, when run as the superuser it will attempt to drop privileges by setting the effective and real IDs to nobody's or nouser's account, or -2 if unavailable. If it cannot relinquish its privileges, it will not run.
See the "-U" option if you do not want this behavior but beware that there are significant security risks if you choose to use "-U".
Since 3.26, using "-F" as the superuser also implies "-U" as opening most files and traversing directories requires privileges that are above the nobody/nogroup level.
Any switches in the "PERLDOC" environment variable will be used before the command line arguments.
Useful values for "PERLDOC" include "-oterm", "-otext", "-ortf", "-oxml", and so on, depending on what modules you have on hand; or the formatter class may be specified exactly with "-MPod::Perldoc::ToTerm" or the like.
"perldoc" also searches directories specified by the "PERL5LIB" (or "PERLLIB" if "PERL5LIB" is not defined) and "PATH" environment variables. (The latter is so that embedded pods for executables, such as "perldoc" itself, are available.)
In directories where either "Makefile.PL" or "Build.PL" exist, "perldoc" will add "." and "lib" first to its search path, and as long as you're not the superuser will add "blib" too. This is really helpful if you're working inside of a build directory and want to read through the docs even if you have a version of a module previously installed.
"perldoc" will use, in order of preference, the pager defined in "PERLDOC_PAGER", "MANPAGER", or "PAGER" before trying to find a pager on its own. ("MANPAGER" is not used if "perldoc" was told to display plain text or unformatted pod.)
When using perldoc in it's "-m" mode (display module source code), "perldoc" will attempt to use the pager set in "PERLDOC_SRC_PAGER". A useful setting for this command is your favorite editor as in "/usr/bin/nano". (Don't judge me.)
One useful value for "PERLDOC_PAGER" is "less -+C -E".
Having PERLDOCDEBUG set to a positive integer will make perldoc emit even more descriptive output than the "-D" switch does; the higher the number, the more it emits.
Up to 3.14_05, the switch -v was used to produce verbose messages of perldoc operation, which is now enabled by -D.
Current maintainer: Mark Allen "<email@example.com>"
Past contributors are: brian d foy "<firstname.lastname@example.org>" Adriano R. Ferreira "<email@example.com>", Sean M. Burke "<firstname.lastname@example.org>", Kenneth Albanowski "<email@example.com>", Andy Dougherty "<firstname.lastname@example.org>", and many others.