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

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

           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

       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.

       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 sub-
       routines are not defined, an attempt is made to generate intelligent messages; for best results, define

       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::STAN-
       DARD_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 v5.8.8                       2001-09-21                    Getopt::Std(3)