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#!/bin/bash
listBacklight=`ls /sys/class/backlight`
if [ $# -gt 1 ] ; then
echo "light2 [VALUE]"
exit
fi
if [ -z "$1" ] ; then
val=150
else
val="$1"
fi
right="sudo"
for r in `groups`; do
if [ $r == "video" ] ; then
right=""
fi
done
if [ -n right ] ; then
echo 'To not use sudo, add yourself to the group "video"'
fi
if [ -n "$listBacklight" ] ; then
for backlight in "$listBacklight"
do
echo "${val}" | $right tee "/sys/class/backlight/${backlight}/brightness" 2>&1 /dev/null
done
else
echo 'No backlight detected'
fi
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