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    <p>Use POD to document your tool, follow the guidelines of manpages; include at least the following sections: NAME, SYNOPSIS, DESCRIPTION, AUTHOR. Once you have proper POD you can generate a man page with pod2man, view the documentation at the console with perldoc your-script.pl.</p> <p>Use a module that handles command line options for you. I really like using <a href="http://search.cpan.org/perldoc?Getopt::Long" rel="noreferrer">Getopt::Long</a> in conjunction with <a href="http://search.cpan.org/perldoc?Pod::Usage" rel="noreferrer">Pod::Usage</a> this way invoking --help will display a nice help message.</p> <p>Make sure that your scripts returns a proper exit value if it was successful or not.</p> <p>Here's a small skeleton of a script that does all of these:</p> <pre><code>#!/usr/bin/perl =head1 NAME simplee - simple program =head1 SYNOPSIS simple [OPTION]... FILE... -v, --verbose use verbose mode --help print this help message Where I&lt;FILE&gt; is a file name. Examples: simple /etc/passwd /dev/null =head1 DESCRIPTION This is as simple program. =head1 AUTHOR Me. =cut use strict; use warnings; use Getopt::Long qw(:config auto_help); use Pod::Usage; exit main(); sub main { # Argument parsing my $verbose; GetOptions( 'verbose' =&gt; \$verbose, ) or pod2usage(1); pod2usage(1) unless @ARGV; my (@files) = @ARGV; foreach my $file (@files) { if (-e $file) { printf "File $file exists\n" if $verbose; } else { print "File $file doesn't exist\n"; } } return 0; } </code></pre>
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    1. POWhat are the best-practices for implementing a CLI tool in Perl?
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    1. COI don't think all of this hand-wringing over exit values is a good idea. Perl provides an implicit exit(0) in the absence of an exit or die. If you die when something is wrong and do nothing special otherwise, you will get a well-behaved program. I think this skeleton would be improved by ditching main entirely. Perl is not C.
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    2. COThe reason for the main function, which makes it look a lot like a C program, is that without it all variables that you would declare in your program would become global lexically scoped variables. With the "main" function all inner variables are scoped to that single function.
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    3. COUh, who cares? There are no other scopes anyway. (But anyway, this is a lot of code to write to do nothing. Why not use MooseX::Getopt with MooseX::Runnable? Then this entire script is not even necessary!)
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