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Community Bot
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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 adapterDoes Apple support DDC/CI for 3rd party displays via Apple's Thunderbolt to DVI adapter for background on why.

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.

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.

This was merged, so I provided the updated links.
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edit approved Dec 3, 2015 at 15:33
Community Bot
edit approved Dec 3, 2015 at 15:33
Community Bot
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You can install this command line tool from github.com/jmstacey/screenbrightnessgithub.com/nriley/brightness. The install is pretty easy if you have homebrew:

brew install screenbrightnessbrightness

And usage is straightforward:

  • Set 100% brightness: screenbrightnessbrightness 1
  • Set 50% brightness: screenbrightnessbrightness 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.

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

brew install screenbrightness

And usage is straightforward:

  • Set 100% brightness: screenbrightness 1
  • Set 50% brightness: screenbrightness 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.

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.

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

brew install screenbrightness

And usage is straightforward:

  • Set 100% brightness: screenbrightness 1
  • Set 50% brightness: screenbrightness 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.