25 lines
460 B
Bash
Executable file
25 lines
460 B
Bash
Executable file
#!/bin/sh
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set -e
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usage() {
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echo "usage: $0 value brightness_path"
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exit 1
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}
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if [ $# -ne 2 ]; then
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usage
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fi
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actual_brightness=$(cat "$2/actual_brightness")
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max_brightness=$(cat "$2/max_brightness")
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new_brightness=$(("$actual_brightness" + "$1"))
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if [ "$new_brightness" -gt "$max_brightness" ]; then
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new_brightness="$max_brightness"
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elif [ "$new_brightness" -lt "0" ]; then
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new_brightness="0"
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fi
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echo "$new_brightness" > "$2/brightness"
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