I second BrowserUK's suggestion of using 'use strict;'. If you're worried about using variables that aren't defined(maybe mis-spelled?), then start doing
#!/usr/bin/perl -w

use strict;

[download]
at the top of every Perl script. I always use both of those.

HTH.

In reply to Re: Re: How do I tell what variables have been defined? by hmerrill
in thread How do I tell what variables have been defined? by spartacus9

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