[Gllug] ed vs emacs/vi, was: ed vs emacs, was: OpenMoko Neo Freerunner

[Harry Rickards]

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On 05/09/09 22:30, Bruce Richardson wrote:
> On Sat, May 09, 2009 at 09:34:49PM +0100, Harry wrote:
>> Purely out if interest, is sed based on ed? I know sed stands for  
>> stream editor, and I assume ed stands for editor, but is sed just an  
>> ed for streams?
> 
> The progression is actually ed -> grep -> sed.  It's more a case of
> inherited concepts rather than evolving code (although originally the
> code for sed was lifted right out of ed by Ken Thompson).  Grep is named
> for a sequence of ed commands (global/regular expression/print) that
> were used so frequently in ed scripts that it made the case for a
> specialised tool.  
> 
> Sed was originally called gres, the idea being that it would do a very
> similar job to grep but with substitution.  Along the way, the developer
> decided to add more functionality and he deliberately based the new
> tool's command set on ed's commands because it had become so unversally
> known; so he named the tool "sed" to reinforce that sense of
> progression.
> 
> 
Thanks for the explanation. So I sort of use sed all the time (with grep).

- -- 
Many thanks
Harry Rickards (a.k.a l33tmyst)

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