On the other paw, there's the shell version of a Schwartzian Transform: 

  for i in *.txt
  do
      mv $i $i~
      perl -ne 'print length, "\t", $_' $i~ | \
        sort +0n | uniq | cut -f2- > $i
  done

[download]

In reply to Re: Using -i in oneliner with postprocessing by tkil
in thread Using -i in oneliner with postprocessing by Anomynous Monk

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