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  • Drop the cat, it seems to be able to find its way in absolutely everywhere where it's not supposed to be. Commented Feb 5, 2018 at 15:15
  • It was just for developing purposes. As you don't know what commands you'll have to insert in the piping, I always start with the cat. Afterwards you can add the file information to the first command. Commented Feb 5, 2018 at 15:19
  • @Kusalananda cats are like that. However, depending on the scenario, the OP might want to use unbuffer and/or xargs or parallel to reduce dead times and improve performance. Commented Feb 5, 2018 at 16:04
  • That while loop doesn't appear to add any value. How about mysql | sed '2,$s#...#...#g' and dispense with the grep too. Commented Feb 5, 2018 at 17:48