Opens a file and places you in command mode similar to that of
vi, but will not allow you to overwrite a file, or save changes you
may make to the file as you normally would in vi while
view-ing the file.
- view readonly.c
- opens a file called readonly.c.
You are now in command mode of the vi editor. However,
you can only READ the file; you cannot make changes and
save them in the same manner as in vi.