WHATIS(1) NetBSD General Commands Manual WHATIS(1)
whatis -- describe what a command is
whatis command ...
The whatis program queries the database /var/db/man.db for manual pages with name command and prints the name of the manual page, the section and the description from the section NAME.
The whatis command appeared in 3.0BSD. It was rewritten in NetBSD 6.0 to use the SQLite index created by makemandb(8). NetBSD 6.0.1 February 1, 2012 NetBSD 6.0.1
You can also request any man page by name and (optionally) by section: