22 lines
397 B
Bash
Executable File
22 lines
397 B
Bash
Executable File
#!/bin/bash -e
|
|
|
|
STEPS=16
|
|
DIR="$(find /sys/class/backlight/* -print -quit)"
|
|
|
|
CUR="$(cat "$DIR/brightness")"
|
|
MAX=$(cat "$DIR/max_brightness")
|
|
|
|
case "${1:0:1}" in
|
|
'') echo "$CUR"; exit ;;
|
|
'+'|'-') CUR=$(((CUR / STEPS + $1) * STEPS)) ;;
|
|
*) CUR="$1" ;;
|
|
esac
|
|
|
|
if [ "$CUR" -lt 0 ]; then
|
|
CUR=0
|
|
elif [ "$CUR" -gt "$MAX" ]; then
|
|
CUR="$MAX"
|
|
fi
|
|
|
|
echo "$CUR" > "$DIR/brightness"
|