xbacklight っぽく gsd-backlight-helper を呼び出すシェルスクリプト

xbacklight

#!/bin/sh
PKEXEC=/usr/bin/pkexec
GSD=/usr/lib/gnome-settings-daemon/gsd-backlight-helper
GETOPT=/usr/bin/getopt
OPT=`getopt -a -o sg --long set, --long get -- "$@"`
show_usage(){
    echo "Usage $0 [--get] [--set number]" 1>&2
}
if [ $? != 0 ]; then
    show_usage
    exit 0
fi
eval set -- "$OPT"
while true
do
    case "$1" in
        -g | --get )
            echo `$PKEXEC $GSD --get-brightness`
            shift
            ;;
        -s | --set )
            MAXVAL=`$PKEXEC $GSD --get-max-brightness`
            if [ $3 -gt $MAXVAL ]; then
                echo "brightness value is greater than MAX value"
                break
            else
                $PKEXEC $GSD --set-brightness $3
            fi
            shift
            ;;
        --)
            shift
            break
            ;;
        *)
            show_usage
            exit 0
            ;;
    esac
done