debug boot script

[ray <hantechs@gmail.com>]

I want to debug an init cript in /etc/rcS.d That script outputs some messages using echo, so the messages should be printed to the stdout. I guess the redirect mechanism provided by shell is supposed to work in order to grab these messages into a file. To verify it, I created a test script in /etc/rcS.d, writing the content as below:

echo "hello" > /tmp/message

But when I boot up the system, nothing happened. Can somebody give me any hint?