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+# brightness
+
+> 获取或设置所有显示设备的亮度等级.
+
+- 显示当前亮度:
+
+`brightness -l`
+
+- 设置亮度到 100%::
+
+`brightness {{1}}`
+
+- 设置亮度到 50%::
+
+`brightness {{0.5}}`