Linux上如何关闭闪烁的WiFi指示灯

在有些Linux发行版上，WiFi指示灯在通信时不停的闪烁。下面给出一种方法停止这种闪烁：

#!/bin/sh

if [ "`id -u`" != "`id -u root`" ]; then
    echo "`whoami`: you need root priviledge to run this application. Invkoing sudo ..." 
    exec sudo bash -c "$0 $@"
fi

for trigger in /sys/class/leds/iwl-*X/trigger; do
    echo none > $trigger
    cat $trigger
done