Steve, can I ask if you are doing that because we really need to do it in Perl, or just to learn? I mean, those two unix programs are very efficient, so, why not just use them?
Also, you can open shell pipes as if they were files. So, you can easilly do:
open PIPE, "sort file | uniq -c |";
Ok, I know I didn't help you how to write those scripts in Perl, but I hope I made you think if you really need to rewrite those tools in Perl.
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