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Ceci est une ancienne révision du document !

nom.sh

#!/bin/sh
 
    print_usage() {
    	printf 'USAGE: %s up|down [STEP]\n' "$(basename "$0")"
    }
 
    get_current() {
    	cat "$FILE"
    }
 
    set_down() {
    	current_value=$(get_current)
    	printf '%s' "$((current_value - STEP))" > "$FILE"
    }
 
    set_up() {
    	current_value=$(get_current)
    	printf '%s' "$((current_value + STEP))" > "$FILE"
    }
 
    if [ $# -lt 1 -o $# -gt 2 ]; then
    	print_usage
    	exit 0
    fi
 
    ACTION="$1"
    STEP="${2:-15}"
 
    FILE='/sys/class/backlight/intel_backlight/brightness'
 
    case "$ACTION" in
    	('down')
    		set_down
    	;;
    	('up')
    		set_up
    	;;
    	(*)
    		print_usage
    		exit 1
    	;;
    esac
 
    exit 0

  puis avec une limite maximale :

nom.sh

    #!/bin/sh
 
print_usage() {
	printf 'USAGE: %s up|down [STEP]\n' "$(basename "$0")"
}
 
get_current() {
	cat "$FILE"
}
 
get_maximum() {
	cat "$FILE_MAX"
}
 
set_down() {
	current_value=$(get_current)
	printf '%s' "$((current_value - STEP))" > "$FILE"
}
 
set_up() {
	value_current=$(get_current)
	value_desired=$((value_current + STEP))
	value_maximum=$(get_maximum)
 
	if [ "$value_desired" -gt "$value_maximum" ]; then
		value_desired="$value_maximum"
	fi
 
	printf '%s' "$value_desired" > "$FILE"
}
 
if [ $# -lt 1 ] || [ $# -gt 2 ]; then
	print_usage
	exit 0
fi
 
ACTION="$1"
STEP="${2:-15}"
 
FILE='/sys/class/backlight/intel_backlight/brightness'
FILE_MAX='/sys/class/backlight/intel_backlight/max_brightness'
 
case "$ACTION" in
	('down')
		set_down
	;;
	('up')
		set_up
	;;
	(*)
		print_usage
		exit 1
	;;
esac
 
exit 0