The SCO OpenServer system
has several editors, which are useful for different purposes:
vi allows you to perform full-screen writing and
editing of files; this is the editor you will use most.
Read-only version of vi. view allows you to
examine text files, but does not allow you to save changes.
Original UNIX system line editor.
ed is line-oriented;
it can only edit a line at a time. Used within
shell scripts, and when it is impossible to configure a terminal properly.
A line editor. Like ed, ex is line-oriented.
Like view, ex is implemented as part
of vi, and the ex command is a link to vi.
Stream editor. sed reads an input file, carries out
a sequence of commands, and writes the result to
its output file. It cannot be used interactively.
``Manipulating text with sed''
for further details.)