Safety net

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#!/usr/bin/perl
use strict;
use warnings;

You should always use them as they are a safety net helping reduce mistakes.

It is usually very hard to add this safety net after you already have some code.

If the warnings you get don't make sense add

use diagnostics;

line and you will get more verbose warnings.

Why are use warnings and use strict so important even in small (< 100 lines) scripts ?

• Help avoiding trouble with recursive functions
• Help avoiding typos in variable names
• Disable unintentional symbolic references
• Reduce debugging time
• Enable/enforce better coding standard => cleaner code, maintainability

• Always use strict and use warnings in your perl code!
• Always use warnings in your Perl code!