You can view the ‘brightness’ source on GitHub if you are interested in how it works or want to review it. To dim Mac screen brightness to 25% dim setting: To turn Mac display brightness to halfway point: To turn Mac screen brightness to 100% brightest setting: The ‘brightness’ tool is easy to use as long as you have Homebrew installed on the Mac, so assuming that’s the case let’s install the ‘brightness’ tool with the following command:Īfter ‘brightness’ has installed, you can use it as follows:
How to Change Mac Screen Brightness via Terminal with ‘brightness’ You can also use the ‘run last command’ !! trick to effectively dim the setting another notch. Therefore you can repeat that command to lower the brightness more if needed. Osascript -e 'tell application "System Events"' -e 'key code 144' -e ' end tell'
Executing the following AppleScript at the command line will dim the screen brightness by one notch, like pressing the brightness down key once on a Mac keyboard:
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