19 lines
381 B
Bash
Executable File
19 lines
381 B
Bash
Executable File
#!/bin/bash -e
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STEPS=16
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DIR="$(printf '%s\n' /sys/class/backlight/* | head -n1)"
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CUR="$(cat "$DIR/brightness")"
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MAX=$(cat "$DIR/max_brightness")
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case "${1:0:1}" in
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'') echo "$CUR"; exit ;;
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'+'|'-') CUR="$(((CUR / STEPS + $1) * STEPS))" ;;
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*) CUR="$1" ;;
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esac
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[ "$CUR" -lt 0 ] && CUR=0
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[ "$CUR" -gt "$MAX" ] && CUR="$MAX"
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echo "$CUR" > "$DIR/brightness"
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