Let me suggest Perl, as this site is mostly about Perl.

I would assume most of the syntax you would use is found in your course material, but also in perlsyn. Personally, I would look at perlrun and use the "autosplit" parameter, together with push and print, and the if statement.

In reply to Re: switching two columns under conditions by Corion
in thread switching two columns under conditions by gghelpneeded

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