19

Is it possible to dim the screen from Terminal, in a Mac with OS X Lion? Is there any command to do control brightness and volume?

18

You can do it via an Applescript and run it as such:

Dimmer:

tell application "System Events"
        key code 107
    end tell

Brighter:

tell application "System Events"
        key code 113
    end tell

You can save these as .script files and then run them from the CLI like this:

osascript ~/Path/to/File

You can also do it this way, but that requires more setup.

  • Not working on Mac OS X 10.12.6. – politicus Jan 29 at 9:50
17

You can install this command line tool from github.com/nriley/brightness. The install is pretty easy if you have homebrew:

brew install brightness

And usage is straightforward:

  • Set 100% brightness: brightness 1
  • Set 50% brightness: brightness 0.5

Unfortunately it doesn't work for external monitors. See Does Apple support DDC/CI for 3rd party displays via Apple's Thunderbolt to DVI adapter for background on why.

  • For me, these instructions installed a command called brightness, not screenbrightness. Otherwise, this worked as described. Thanks! – octern Oct 10 '15 at 12:42
  • I think it have to do with a github merge of projects. When that happened they updated the command to brightness (which someone in Community happily already fixed in the answer). – studgeek Jul 2 '17 at 23:07
  • Note that the brightness Homebrew package is currently broken under macOS 10.13. See github.com/nriley/brightness/issues/21. – Taylor Edmiston Sep 12 '18 at 15:38
10

screenshot

I've created a node module for this that supports setting the brightness using the CLI. See https://github.com/kevva/brightness-cli.

npm install --global brightness-cli

And then simply just run brightness from your command line.

  • Doesn't work for me: $ brightness 100 /usr/local/lib/node_modules/brightness-cli/cli.js:3 const brightness = require('brightness'); ^^^^^ SyntaxError: Use of const in strict mode. at Module._compile (module.js:439:25) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:902:3 – Kibber Jun 23 '16 at 21:29
  • work for me but it does not tell at system level – Shahid Ghafoor Nov 10 '18 at 11:08

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