Re: how to write script usage sub routine for the perl file? the dynamic duo with Pod::Usage

Hello perlanswers and welcome to the monastery and to wonderful world of Perl!

There are many way to do it but I found the following particulary useful and versatile: The Dynamic Duo --or-- Holy Getopt::Long, Pod::UsageMan!

Infact Pod::Usage can semplfy a lot such part of a program: it can shows sections of your choice of the POD embed in the program (I'm used to put the POD after the __DATA__ token), it has the ability to modify the exit value with the useful NOEXIT feature.

The module can semplify a lot the help and manual commandline options; let's see it's recommendend usage:

use strict;
use Pod::Usage;
use Getopt::Long;
 
## Parse options
my %opt;
GetOptions(\%opt, "help|?", "man", "flag1")  ||  pod2usage(2);
pod2usage(1)  if ($opt{help});
pod2usage(-exitval => 0, -verbose => 2)  if ($opt{man});
 
## Check for too many filenames
pod2usage("$0: Too many files given.\n")  if (@ARGV > 1);
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Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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