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Locating man pages by subject

There is a keyword option in the man command that can be used to find man pages that have specific words in their descriptions. An example is:

    man -k process

to find all man pages that talk about processes. Use the command:

    man -k process |grep kernel

to find information on kernel processes. An equivalent command is the apropos command as follows:

    apropos process

copied from Finding Files in Linux