ybacklight

Manage screen backlight brightness. See also `xbacklight`.

TLDR

Print current brightness and maximal brightness, shortened and separated by a slash

$ ybacklight Sc/Sm
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Set the brightness to 420

$ ybacklight s[420]
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Increase the brightness by 42 big steps (4200 by default)

$ ybacklight Si[42]
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Decrease the brightness by 300

$ ybacklight d[300]
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