If your program says:
use Getopt::Long; GetOptions("verbose" => $verbose, "debug" => $debug, "output=s" => $output);
it can be called from the command line like this:
%prog --verbose more args here
%prog --debug more args here
%prog -v -d more args here
%prog --output=somefile more args here
%prog -o somefile more args here
The Getopt::Long
module provides a
GetOptions
function to process command-line
switches with long names. It includes support for things like
abbreviating switches, typed arguments like Boolean or string or
integer or float, array variables for repeating options, user-defined
validation routines, POSIX-conforming versus FSF-style processing,
case-insensitive options, and traditional bundling of short
options—just to name a few out of its vast cornucopia of features. If
this module is overkill, consider the more traditional
Getopt::Std
module described next. If this module
is underkill, check out the CPAN module
Getopt::Declare
, which provides a more declarative
syntax for option specification.