Hi here is some comman comands when using Vi text editor:
if you have to edit a file like ram.sh you put this command
$ vi ram.sh
now u can edit the file ...
if you want to creat a new file with vi in this case the file name is ram follow the steps i writing here:
$ vi ram
now it open text editor to insert the text esc+i
to save the text esc + : + w
to quit from text editor esc + : + q