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CentOS 6.3 / RHEL 6.3

Can someone please explain the difference between the whatis command and the apropos command? I noticed that both appear to be installed by default and I'm not sure what the difference is between them.

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Probably yum provides whatis and yum provides apropos will both list the same man, man-db or similar package. Actually whatis is the same as man -f and apropos the same as man -k. See whether those two switch's description in man man is easier to understand. –  manatwork Mar 24 '13 at 16:47
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whatis ls lists the manual pages for ls, apropos ls lists all manual pages that contain ls in their title. The first list here gives 2 entries, the second 1385.

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