WHATIS(1) NetBSD General Commands Manual WHATIS(1)
whatis -- describe what a command is
whatis [-C path] command ...
The whatis program queries the apropos database built by makemandb(8). It searches for manual pages with name command and outputs name of the matching manual pages along with the section and the brief description from the NAME section. It supports the following options: -C path Use different man(1) configuration file than the default, /etc/man.conf.
/etc/man.conf The location of the Sqlite FTS database can be configured using the _mandb tag.
apropos(1), man(1), man.conf(5), makemandb(8)
The whatis command appeared in 3.0BSD. It was rewritten in NetBSD 6.0 to use the SQLite index created by makemandb(8). NetBSD 8.1 June 16, 2016 NetBSD 8.1
You can also request any man page by name and (optionally) by section: