On 06/30/2012 08:01 PM, David Seikel wrote:
Actually, vi includes an ex mode, and ex includes an ed mode. Think ed might just come for free with vi.
On Unix back when I learned it (AT&T Sys V R2 in the 80's), vi, ex, and view (read-only mode) were links to the same underlying executable. Which personality it assumed depended upon the name it was called by, and you could change modes on the fly.
I haven't Looked Stuff Up, so I don't know offhand how much difference there is between ex and ed, though my recollection is that ex is a superset of ed, so ed more would be a restricted portion of ex.
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