This can make by adding command in /etc/rc.local.
#su
#gedit /etc/rc.local
In my case, i need to enable ip forward after PC router boot up.
So i add the command to the /etc/rc.local.
#echo 1 > /proc/sys/net/ipv4/ip_forward
Save the /etc/rc.local.
You can type #/etc/rc.local start to test the command.