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. It 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.
