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Pod::Usage - POD document output

Pod::Usage is a module for outputting POD documents. You can use a function called pod2usage that displays the documentation and terminates the program.

If you use a function, it's a good idea to import it explicitly.

# Import function
use Pod::Usage 'pod2usage';

This is the most basic usage example of pod2 usage. Exit the program by displaying the item "SYNOPSIS" in the document.

# The most basic usage of Pod::Usage

=head1 SYNOPSIS

script.pl FILE

=cut

use Pod::Usage 'pod2usage';

# Command line arguments
my $file = shift;

# If there is no argument, display SYNOPSIS and exit the program
pod2usage () unless $file;

If there is no command line argument, the following will be displayed and the program will terminate.

Usage:
    script.pl FILE

This is an example that combines Pod::Usage and Getopt::Long.

# Combine Pod::Usage and Getopt::Long

=head1 SYNOPSIS

script.pl [- force] FILE

=cut

use Pod::Usage 'pod2usage';
use Getopt::Long 'GetOptions';

# Analysis of command line options
my $force;
GetOptions('force' => \$force) or pod2usage;

my $file = shift;
pod2usage unless $file;