53 lines
1.1 KiB
Text
53 lines
1.1 KiB
Text
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#!/bin/bash
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if test ! -e /sys/class/backlight/backlight/brightness
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then
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echo "no brightness found" >&2
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exit 1
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fi
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setValue() {
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NEWVAL=$1
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XMAX=$2
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test "${NEWVAL}" -lt 0 && NEWVAL=0
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test "${NEWVAL}" -gt "${XMAX}" && NEWVAL="${XMAX}"
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echo "${NEWVAL}" > /sys/class/backlight/backlight/brightness
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}
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# get
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if test $# = 0
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then
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X=$(cat /sys/class/backlight/backlight/brightness)
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XMAX=$(cat /sys/class/backlight/backlight/max_brightness)
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echo $(expr "${X}" "*" "100" / "${XMAX}")
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exit 0
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fi
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# set
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if test $# = 1
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then
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XMAX=$(cat /sys/class/backlight/backlight/max_brightness)
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NEWVAL=$(expr "${1}" "*" "${XMAX}" / 100)
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setValue "${NEWVAL}" "${XMAX}"
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exit 0
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fi
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# set +
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if test $# = 2
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then
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X=$(cat /sys/class/backlight/backlight/brightness)
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XMAX=$(cat /sys/class/backlight/backlight/max_brightness)
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DELTA=$(expr "${2}" '*' ${XMAX} / 100)
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NEWVAL=$(expr "${X}" "${1}" "${DELTA}")
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setValue "${NEWVAL}" "${XMAX}"
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exit 0
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fi
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# help
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echo "${0}" >&2
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echo "${0} + 10" >&2
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echo "${0} - 20" >&2
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exit 1
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