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1.6.3 vi

The command vi filename will open the filename file and place you in the command mode of the vi editor. vi is ONE widely utilized text editor available on UNIX systems. There are others, such as emacs, which will not be discussed within this document.

Examples
vi parallel.m
opens a file called parallel.m. If one does not already exist, a new file named parallel.m is created and opened. You are now in command mode of the vi editor.
vi -r matrix1.f
will allow you to recover most or all of the work you had finished on the matrix1.f file in the current working subdirectory if you were working on this matrix1.f file when the system crashed.

Look here for more details on vi.