Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

-M directory

Change or otherwise limit the directories to search for manual

sections.

-S directory

Change or otherwise limit the directories to search for sources.

Example

Find all files in /usr/bin that are not documented in /usr/share/man/

man1 but that have source in /usr/src:

$ cd /usr/bin

$ whereis -u -M /usr/share/man/man1 -S /usr/src -f *

which

which [options] [--] [commands]

List the full pathnames of the files that would be executed if the

named commands had been run. which searches the user’s $PATH

environment variable.

Options

-a, --all

Print all matches, not just the first.

-i, --read-alias

Read aliases from standard input and write matches to stan-

dard output. Useful for using an alias for which.

--read-functions

Read shell functions from standard input and report matches

to standard output. Useful for also using a shell function for

which itself.

--skip-alias

Ignore --read-alias if present. Useful for finding normal bina-

ries while using --read-alias in an alias for which.

--skip-dot

Skip directories that start with a dot.

--skip-functions

Ignore --read-functions if present. Useful when searching for

normal binaries while using --read-functions in an alias or

function for which.

--skip-tilde

Skip directories that start with a tilde (~) and executables in

$HOME. ...