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.
troff --version (return code: 0)
GNU troff (groff) version 1.22.3
troff --help (return code: 0)
usage: troff -abcivzCERU -wname -Wname -dcs -ffam -mname -nnum -olist
-rcn -Tname -Fdir -Idir -Mdir [files...]