whatis and info commands
Two other commands that give information about other commands are
whatis and info. Both accept an argument much like the man command.
The whatis commandprints just
a short description of the command in question.
$ whatis ls
ls (1) - list
directory contents
ls (1p) - list directory contents
The whatis command is dependent on a database which
has to occasionally be rebuilt to include new software, but as can
be seen in the output above, it offers a nice succinct description.
The info commandis similar to
man but uses a different set of files to display command
documentation.
$ info
mkdir
12.3 `mkdir': Make directories
==============================
`mkdir' creates directories with the
specified names. Synopsis:
mkdir [OPTION]... NAME...
If a NAME is an existing file but not a directory, `mkdir' prints
a warning message on stderr (standard error) and exits with a status
of 1 after processing any remaining NAMEs. The same is done when a
NAME is an existing directory and the -p option is not given. If a
NAME is an existing directory and the -p option is given, `mkdir'
ignores it. That is, `mkdir' does not print a warning, raise an
error, or change the mode of the directory, even if the -m option is
given, and will move on to processing any remaining NAMEs.
The program accepts the following options. Also see *Note
Common options:
`-m MODE'
`--mode=MODE'
Set the mode of created directories to MODE, which is symbolic as in
chmod and uses a=rwx (read, write and execute allowed for everyone)
for the point of the departure.
Most commands have more documentation in the man page than is
available in info, but there are occasional exceptions, so it is
worth keeping info in mind. Unlike the man and whatis commands,
info can be called without any arguments. That displays a list of
commands for which info pages are available.
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