I have the following test.sh script in the /etc/init.d and a link of it in the rc3.d as S90test. And my run level is 3.

So my purpose is to read the gpio and choose which program to run.
But when I reboot, it will always run test2. However, if I type "sh ./test.sh" in the terminal after the booting, it will gives me test1. And I did not change the hardware input.

So I wonder is this /sys/class/gpio/gpio94/value file exists before the test.sh is invoked during rebooting?

#! /bin/bash
source /etc/profile

value=`cat /sys/class/gpio/gpio94/value`
echo $value
if [ $value -eq 0 ]
then
./test1
else
./test2
fi

If you look at some of the entries in /etc/init.d you will see that they do modprobe to load the modules that they need. Loading the gpio module will most likely create those sysfs files.

I've checked the init.d directory and the rc3.d directory. I'm assuming my script to have S90, and there is only a S99rmnologin which runs after my script.

So if it was like what you mentioned, this gpio module must be loaded in somewhere else, not in the rc3.d. Is there a way to find it out?

And btw, there is no rc.local in my system.

I dont know why but after a day this is working...I did not modify anything.