| TAC(1) | General Commands Manual | TAC(1) | 
tac —
| tac | [file ...] | 
tac (cat backwards) outputs the contents of each of the
  specified files, or the standard input if no files are specified, in reverse
  line order to the standard output.
tac utility exits 0 on success,
  and >0 if an error occurs.
tac utility doesn't support any of the options of
  GNU tac.
| June 20, 2020 | NetBSD 10.0 |