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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.


ruptime [options]

TCP/IP command. Provide information on how long each machine on the local network has been up and which users are logged into each. If a machine has not reported in for 11 minutes, assume it is down. The listing is sorted by hostname. ruptime depends on rwhod.



Include users who have been idle for more than one hour.


Sort machines by load average.


Reverse the normal sort order.


Sort machines by uptime.


Sort machines by the number of users logged in.

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