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    Nice idea, using Awk for two passes. :) If you're going to do that, though, you don't even need to store lines. I decided to post the alternate approach as an answer rather than a comment since the explanation was a bit long. Commented Nov 4, 2016 at 2:32
  • Don, I noticed that for some reason your command is leaving some duplicates. If you run your command and re-direct to a new file the do something like "grep program | awk '{print $6}' | sort | uniq -c | sort -nr | less" you will hopefully see what I'm talking about. Commented Nov 4, 2016 at 16:08
  • record-keeping purposes. You can still see the anomaly when not re-directing its just easier that way for me to verify that there were no duplicates. I did not mean to imply that a re-direct was a possible cause of the results I was seeing. Commented Nov 4, 2016 at 16:32
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    @user53029 - you do realise I don't have access to your data so I can't replicate whatever happens on your side hence I cannot see any anomaly (I don't see how the solutions above could print duplicate entries anyway - it's impossible "by design" - unless you have duplicate lines like in, entire lines) ? Commented Nov 4, 2016 at 16:38