apropos — Searches through the one-line usage messages for each mged command and displays the name of each command where a match is found.
The apropos command searches through the one-line usage messages for specified mged commands and displays the commands that match.
Example 1. List all commands having "region" in their one-line usage messages.
build_region eac edcodes edcomb em idents item lm r rcodes read_muves red
regdef regions reid remat summary wcodes whatid whichair whichid