Linux man -k (apropos)
This command will display all type of results related to your keyword search in the man page just like apropos (which we'll study in later sections) does. It can be useful in the case when you don't know the exact name of a command.
Result will be displayed in a format having title, section number and its description as shown below. Apropos is not case sensitive which makes it more convenient to use.
For clear understanding, we have given an example of 'chmod' keyword. It displays all the results related to our keyword search 'chmod'.