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
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.
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.