Most of the commands in UN*X also have a "manual page". Advanced features of commands, additional parameters about commands can be obtained from the man page.
Basic usage is:
man command E.g. man man man ls
there are two similar commands, apropos and whatis.
apropos keyword
will print the summary line of all man pages that contain the keyword, while
whatis command
will print a one line summary about command instead of the whole manual.
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