40 lines
598 B
Bash
Executable File
40 lines
598 B
Bash
Executable File
#!/usr/bin/bash
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set -e
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shopt -s extglob nullglob
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set_brightness() {
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MAX="$(cat "$1"/max_brightness)"
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FILE="$1"/brightness
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VAL="$(($2 * MAX / 100))"
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echo "$VAL" > "$FILE"
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}
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CUR_FILE=/var/tmp/current_brightness
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set +e
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CUR="$(cat "$CUR_FILE" || echo 50)"
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set -e
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case "${1:0:1}" in
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"")
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exit 1
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;;
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"+"|"-")
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NEW="$((CUR + $1))"
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;;
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*)
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NEW="$1"
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;;
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esac
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[ "$NEW" -lt 0 ] && NEW=0
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[ "$NEW" -gt 100 ] && NEW=100
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for dev in /sys/class/backlight/*; do
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set_brightness "$dev" "$NEW"
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done
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echo "$NEW" > "$CUR_FILE"
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echo "$NEW"
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