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When you do not know the name of the command you need to carry out a particular task, you can use apropos with a keyword to search for it. This utility searches for the keyword in the short description line (the top line) of all man pages and displays those that contain a match. The man utility, when called with the –k (keyword) option, gives you the same output as apropos (it is the same command).

Note:
The database apropos uses, named whatis, is not on Ubuntu Linux systems when they are first installed, but is built automatically by cron (page668) using mandb. If apropos does not produce any output, run the command sudo mandb.