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  1. or download this
        join(t, @F)
  2. or download this
        F='  '  # Enter a tab here.
    perl -F"$F" -i -wlne "munge(@F); print join('$F',@F);" file
  3. or download this
       perl -F"$F" -i -wlpe 'munge(@F); $_ = join("'$F'",@F);'