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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.


swapon [options] devices

System administration command. Make the listed devices available for swapping and paging.



Consult /etc/fstab for devices marked sw. Use those in place of the devices argument.


Used with -a. Don't complain about missing devices.


Print help message, then exit.

-p priority

Specify a priority for the swap area. Higher priority areas will be used up before lower priority areas are used.


Print swap usage summaries, then exit.


Print version information, then exit.

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