light:tldr:4ffbc

light: Reduce 20 percent from the current backlight value.

light

$ light -U ${20}

try on your machine

This command appears to be using the "light" command with the option of "-U" followed by "${20}".

The "light" command is typically used to control the backlight brightness of a display on Unix-based systems. This command might be specific to a certain operating system or utility, so its behavior may vary depending on the specific implementation.

The option "-U" is likely an argument that specifies an increase in brightness. The exact behavior of this option may depend on the particular implementation and the range of acceptable values for brightness adjustment.

Regarding "${20}", it seems to be a placeholder or variable reference. In some programming or scripting languages, this syntax is used to refer to the value stored in a variable called "20". Without additional context, it is not possible to determine the intended value or purpose of this variable.

Overall, the command seems to adjust the brightness of the display using the "light" command, potentially increasing it by the value stored in the variable "${20}".

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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