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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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sysctl

sysctl [options] [key]

System administration command. Examine or modify kernel parameters at runtime using the /proc/sys filesystem. While many of these kernel keys can be altered by other utilities, sysctl provides a single interface to kernel settings.

Options

-a, -A

Display all available values.

-e

Ignore requests for unknown keys.

-n

Print values only, no keynames.

-p

Reset keys from information specified in /etc/sysctl.conf.

-w key=value

Write a new value to the specified key.