The Getopt::Long module implements an extended getopt function
called GetOptions().
It parses the command line from @ARGV, recognizing and removing
specified options and their possible values.

This function adheres to the POSIX syntax for command line options,
with GNU extensions.
In general, this means that options have long names instead of
single letters, and are introduced with a double dash "--".
Support for bundling of command line options, as was the case
with the more traditional single-letter approach, is provided
but not enabled by default.