Yes, you're are correct. The migration was Unix --> Linux ; I only mentioned Win32, because I also have Perl installed at home, it saves a bit on bandwidth and testing time, and for teaching myself some more perl. That said, there are a number of things I can't do on the Win32 box. :(

It just looks like you have possibly multiple sources of tainted data that you need to untaint before using.

I've never heard of the word taint before, although if something is "tainted", in english, it is "dirty", so I assume tainted data is "dirty data" ?

The cannonical way to untaint your data is by using a regular expression. For example, your $seq variable is read from a file and is supposed to be a number but perl has no way of knowing this; it's just text read from a file. So, to untaint it:

($seq) = $seq =~ /(\d+)/;     # Just grab the first run of digits
[download]

Great, thanks for the tip on how to untaint :)

Peter