Rich--
I'm not certain from your email exactly which columns you want to
de-duplicate on, but the solution is to use sort:
sort -u -k1,4 inputfile >inputfile.de-duped
The "-k" option should specify the range of columns you want to use
for de-duplication. The "-u" tells sort to only output the lines that
are unique on those columns. Of course your output will also end up
being re-sorted on those columns, so you may have to re-order it again
after you're finished de-duping.
--
Hal Pomeranz, Founder/CEO Deer Run Associates h...@deer-run.com
Computer Forensic Investigations, Information Security, Training
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