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    the first command works for me, second has a minor typo (closing parenthesis in print stmt) and doesn't set OFS... what is your awk version? probably you have dos style line endings? (but that doesn't cause an issue when I checked) Commented Oct 21, 2017 at 15:36
  • How do I know my awk version? Yes, I typed it wrong in here, but it's correct in my script. Commented Oct 21, 2017 at 15:58
  • With old awk you could try awk -F, '$7 == "-99"'. Commented Oct 21, 2017 at 15:59
  • for version, try the command awk --version if that doesn't work, check man awk Commented Oct 21, 2017 at 16:02
  • My version is 1.2 Commented Oct 21, 2017 at 16:31