I hope someone can give me a few good pointers.

I have googled the standart shell commands. ls is the is the counterpart to dir and so on.
Now, in dos i can write batch files, with would have the ending .bat so my pc knows what to do with them.
While searching the web, i read it would be .sh in linux, but it didn't work for me.

What file extension do i need for linux?

To be sure, there are no file links, I tried notesm, leafpad and PyTKEditor for writing the scripts.
Also, on some messed up pc's i have to tell windows, that .bat files are executet in the comandline..

Do i have to make such a conection on my N800 too?

I have installed xterm and i can access root with "sudo gainroot" ..
Haven't done much more until know, because i want to understand what i do, before i messed up.

Thanks for your help,
Eismaus