Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
nroff --version (return code: 0)
GNU nroff (groff) version 1.22.3
nroff --help (return code: 0)
usage: nroff [-CchipStUv] [-dCS] [-MDIR] [-mNAME] [-nNUM] [-oLIST]
[-rCN] [-Tname] [-WNAME] [-wNAME] [FILE...]