Find Out About a Unix Command

$ whatis date
date           date (1)    - write the date and time
$ whatis whatis
whatis         whatis (1)  - display a one-line summary about a keyword
$ whatis man
man            man (1)     - find and display reference manual pages
man            man (5)     - macros to format Reference Manual pages
$ whatis time
time           time (1)    - time a simple command
time           time (2)    - get time                   
$ 
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