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Getopt::Std(3pm)                      Perl Programmers Reference Guide                      Getopt::Std(3pm)



NAME
       getopt, getopts - Process single-character switches with switch clustering

SYNOPSIS
           use Getopt::Std;

           getopt('oDI');    # -o, -D & -I take arg.  Sets $opt_* as a side effect.
           getopt('oDI', \%opts);    # -o, -D & -I take arg.  Values in %opts
           getopts('oif:');  # -o & -i are boolean flags, -f takes an argument
                             # Sets $opt_* as a side effect.
           getopts('oif:', \%opts);  # options as above. Values in %opts

DESCRIPTION
       The getopt() function processes single-character switches with switch clustering.  Pass one argument
       which is a string containing all switches that take an argument.  For each switch found, sets $opt_x
       (where x is the switch name) to the value of the argument if an argument is expected, or 1 otherwise.
       Switches which take an argument don't care whether there is a space between the switch and the
       argument.

       The getopts() function is similar, but you should pass to it the list of all switches to be
       recognized.  If unspecified switches are found on the command-line, the user will be warned that an
       unknown option was given.  The getopts() function returns true unless an invalid option was found.

       Note that, if your code is running under the recommended "use strict 'vars'" pragma, you will need to
       declare these package variables with "our":

           our($opt_x, $opt_y);

       For those of you who don't like additional global variables being created, getopt() and getopts()
       will also accept a hash reference as an optional second argument.  Hash keys will be x (where x is
       the switch name) with key values the value of the argument or 1 if no argument is specified.

       To allow programs to process arguments that look like switches, but aren't, both functions will stop
       processing switches when they see the argument "--".  The "--" will be removed from @ARGV.

"--help" and "--version"
       If "-" is not a recognized switch letter, getopts() supports arguments "--help" and "--version".  If
       "main::HELP_MESSAGE()" and/or "main::VERSION_MESSAGE()" are defined, they are called; the arguments
       are the output file handle, the name of option-processing package, its version, and the switches
       string.  If the subroutines are not defined, an attempt is made to generate intelligent messages; for
       best results, define $main::VERSION.

       If embedded documentation (in pod format, see perlpod) is detected in the script, "--help" will also
       show how to access the documentation.

       Note that due to excessive paranoia, if $Getopt::Std::STANDARD_HELP_VERSION isn't true (the default
       is false), then the messages are printed on STDERR, and the processing continues after the messages
       are printed.  This being the opposite of the standard-conforming behaviour, it is strongly
       recommended to set $Getopt::Std::STANDARD_HELP_VERSION to true.

       One can change the output file handle of the messages by setting $Getopt::Std::OUTPUT_HELP_VERSION.
       One can print the messages of "--help" (without the "Usage:" line) and "--version" by calling
       functions help_mess() and version_mess() with the switches string as an argument.



perl v5.16.2                                     2012-10-11                                 Getopt::Std(3pm)