Editing options
vi has many options that change the way the editor behaves during an editing session. We will discuss a few that may be immediately useful. For a complete list of these options, see the vi command description in z/OS UNIX System Services Command Reference.
You must be in Command Mode to set options. To set an option, begin
by typing a colon (:). You will see the cursor move to the bottom
of the screen. Then type the word set, a space, and the
name of the option you want to set—we will talk about option
names in a moment. You can correct typing mistakes by backspacing.
When you have typed everything correctly, press <Enter>.
One commonly used option is "ignorecase". If you type:
:set ignorecase:set noignorecase