troff

The troff processor of the groff text formatting system

Location

$ whereis -b troff
troff: /usr/bin/troff

$ troff --help
usage: troff -abcivzCERU -wname -Wname -dcs -ffam -mname -nnum -olist
       -rcn -Tname -Fdir -Idir -Mdir [files...]