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    -1 1 -2 1 is equal -j 1 Commented Apr 8, 2015 at 13:41
  • @Costas fwiw, POSIX.1-2017 states: Earlier versions of this standard allowed -j, -j1, -j2 options […]. These forms are no longer specified by POSIX.1-2017 but may be present in some implementations. Commented May 24, 2018 at 13:00