Getopt::Std(3)

NAME
getopt - Process single-character switches with switch clustering

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() functions 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, or 1 if no argument. Switches which take an argument don't care whether there is a space between the switch and the argument.

Note that, if your code is running under the recommended use strict 'vars' pragma, it may be helpful to declare these package variables via use vars perhaps something like this:

    use vars qw/ $opt_foo $opt_bar /;
For those of you who don't like additional 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.