is not an actual file. It's a symbolic link to the actual device file that your mouse is attached to. Changing the permissions on the link woul be pointless. Just try the following:
[rouben@amazon rouben]$ cd /dev
[rouben@amazon dev]$ ls -la mouse
lrwxrwxrwx 1 root root 5 Dec 20 15:43 mouse -> ttyS0
[rouben@amazon dev]$ ls -la ttyS0
crw-rw---- 1 root uucp 4, 64 May 28 16:41 ttyS0
As you can see, this will allow you to figure out what the actual device file for your mouse is. In my case it's hooked up to COM1 (ttyS0). If you have a PS/2 mouse, the device file is usually called psaux
. But then again, you'll know for sure if you try what I suggested.
P.S. Try xf86config to configure your X server. It's not a GUI, completely text-based, so you will not have to use your mouse.