uninit - Warn about uninitialized variables
perl -Muninit myprogram
It's all very well being warned about the use of undef if you don't know what variable it is that contains undef, especially if you've got more than one variable in a line.
uninit attempts to do compile-time static checking of your program to see if any variables are used before they have any values assigned to them; it also reports which variable actually caused the problem.
It isn't guaranteed to catch all cases, and you can probably trick it with judicious use of eval, but I can't do anything about that. It's only a guideline.
Simon Cozens, email@example.com
To install uninit, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.