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  • why not egrep -v dBm File.csv > Result.csv? do the other columns take dBm value as well and should not be removed? Commented Jun 27, 2019 at 9:03
  • Yes, other column takes "dBm" but I only need the string should be search only in Column 1,3,and 4. Commented Jun 27, 2019 at 9:07