whatis - Describes a command's function
whatis [-M pathname] keyword...
command looks up a keyword, which may
be a command, system call, library function, or special filename and displays
line from the reference page. You can then issue
command to display additional information.
Specifies an alternative search path. The search path is
a list of directories, separated by
(colons), in which
expects to find the standard manual subdirectories. (For
more information, see the
command is equivalent to the
command with the
To find out what function the ls command performs, enter: whatis ls
to extract keywords from
Commands: apropos(1), man(1), catman(8)