VI is a very powerful text editor available on Unix and Linux platforms (often replaced by "vim"). It can be a bit overwhelming at first but once you get used to it you can appreciate just how useful it is - global (or selective) replacement is a breeze, insering text from other files no problem... its a great tool.

Attached is a training document we prepared for a half day introduction to the Unix "vi" editor, it might provide a helpful introduction to using "vi".

VI Training Notes