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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.

Buy it now, or read it online on Safari Bookshelf.


unexpand [options] [files]

Convert strings of initial whitespace, consisting of at least two spaces and/or tabs, to tabs. Read from standard input if given no file or a file named -.


-a, --all

Convert all, not just leading, strings of spaces and tabs.


Convert only leading spaces and tabs. Overrides -a.

-t nums, --tabs nums

nums is a comma-separated list of integers that specify the placement of tab stops. If a single integer is provided, the tab stops are set to every integer spaces. By default, tab stops are eight spaces apart. This option implies -a.


Print help message and then exit.


Print the version number and then exit.

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