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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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ldconfig [options] directories

System administration command. Examine the libraries in the given directories, /etc/, /usr/lib, and /lib; update links and cache where necessary. Usually run in startup files or after the installation of new shared libraries.


-C filename

Use filename instead of /etc/


Use filename instead of /etc/


Library mode. Expect libraries as arguments, not directories. Manually link specified libraries.


Suppress examination of /usr/lib and /lib and reading of /etc/; do not cache.


Do not cache; only link.


Print all directories and candidate libraries in the cache. Used without arguments.


Verbose mode. Include version number, and announce each directory as it is scanned and links as they are created.


Do not link; only rebuild cache.



Linker and loader.


List of directories that contain libraries.


List of the libraries found in those libraries mentioned in /etc/

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