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sysctl — List and change kernel runtime variables. More information: <https://manned.org/sysctl.8>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandandruntimeclichangesysctllistkernel

linux

Problem

How to use the sysctl command: List and change kernel runtime variables. More information: <https://manned.org/sysctl.8>.

Solution

sysctl — List and change kernel runtime variables. More information: <https://manned.org/sysctl.8>.

Show all available variables and their values:

sysctl {{[-a|--all]}}

Set a changeable kernel state variable:

sysctl {{[-w|--write]}} {{section.tunable}}={{value}}

Get currently open file handlers:

sysctl fs.file-nr

Get limit for simultaneous open files:

sysctl fs.file-max

Apply changes from /etc/sysctl.conf:

sysctl {{[-p|--load]}}

Code Snippets

Show all available variables and their values

sysctl {{[-a|--all]}}

Set a changeable kernel state variable

sysctl {{[-w|--write]}} {{section.tunable}}={{value}}

Get currently open file handlers

sysctl fs.file-nr

Get limit for simultaneous open files

sysctl fs.file-max

Apply changes from `/etc/sysctl.conf`

sysctl {{[-p|--load]}}

Context

tldr-pages: linux/sysctl

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