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sysctl — Access kernel state information. More information: <https://keith.github.io/xcode-man-pages/sysctl.8

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

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commandaccessstatecliinformationsysctlmorekernel

macos

Problem

How to use the sysctl command: Access kernel state information. More information: <https://keith.github.io/xcode-man-pages/sysctl.8.html>.

Solution

sysctl — Access kernel state information. More information: <https://keith.github.io/xcode-man-pages/sysctl.8.html>.

Show all available variables and their values:

sysctl -a

Show Apple model identifier:

sysctl -n hw.model

Show CPU model:

sysctl -n machdep.cpu.brand_string

Show available CPU features (MMX, SSE, SSE2, SSE3, AES, etc):

sysctl -n machdep.cpu.features

Set a changeable kernel state variable:

sysctl -w {{section.tunable}}={{value}}

Code Snippets

Show all available variables and their values

sysctl -a

Show Apple model identifier

sysctl -n hw.model

Show CPU model

sysctl -n machdep.cpu.brand_string

Show available CPU features (MMX, SSE, SSE2, SSE3, AES, etc)

sysctl -n machdep.cpu.features

Set a changeable kernel state variable

sysctl -w {{section.tunable}}={{value}}

Context

tldr-pages: osx/sysctl

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