Day Three - First shell prompt - new linuxrc

I change linuxrc and my first shell prompt appears , here is my new linuxrc :

#!/bin/sh
echo " Hello World !! 0.3"
echo "Mounting /proc filesystem"
mount -t proc /proc /proc
echo "Launching a demo shell"
/bin/sh
umount /proc

and I add this line to my script before # /dev :

mkdir initrdDIR/proc