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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.


w [options] [user]

Print summaries of system usage, currently logged-in users, and what those users are doing. w is essentially a combination of uptime, who, and ps -a. Display output for one user by specifying user.



Toggle printing the from (remote hostname) field.


Suppress headings and uptime information.


Use the short format.


Ignore the username while figuring out the current process and CPU times.


Display version information.



List of users currently logged in.

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