On Mon, 6 Jul 2020, Clem Cole wrote:

> I always recommend doing the exercises in Rob and Brian's UPE on ed 
> because then everything else makes sense, like sed or any other editor.  
>  Plus you get the advantage you point out, and the reality is that so 
> many simpler editors (like edlin) have similar functionality, it means 
> you can get something done, just about anywhere.

There was also the client we had in PNG, where access was via a flakey 
1200 modem i.e. no error correction, and VI was out of the question.

I learned to use ED when V5 first appeared (down-under) in the 70s (it was 
the *only* editor) and I'm glad that I did.

I must grab a copy of UPE and read it again, just for old times' sake.

-- Dave