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Linux® Desk Reference, Second Edition by Scott Hawkins

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Commands

apropos

keyword

Search the whatis database for keyword. Provides terse, but thorough, documentation. Good place to start looking if you're clueless. You must run makewhatis before using keyword.

Example: To retrieve information on the various files and executables dealing with passwords, use

apropos passwd

info

options keyword

Info is a hypertext reader that searches and displays on-line documentation about the specified keyword.

Example: To look up information on the cd command, use

info cd

Example: To look up information on the grep command and store it in output file grep.doc, use

info -o grep.doc grep

--directory DIRECTORY-PATH, -d DIRECTORY-PATH Look for info files in the specified directories.
--file FILENAME, -f FILENAME

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