David Kastrup <dak@gnu.org> writes:

> I saw the following change:
>
> 2006-10-15  Lennart Borgman  [...]
>
> 	* progmodes/ada-xref.el (ada-find-in-src-path): Likewise.
> 	Use grep -E rather than egrep.
>
> Is there a particular reason to prefer "grep -E"?  I would have
> thought that "egrep" is much more portable?

The SUSv3  [1] doesn't have  any entry for  « egrep », and  only knows
about « grep -E ». egrep hasn't been « carried forward ».

So you're probably right about egrep being much more portable, because
it's been created before grep -E, but in the future, egrep is meant to
disappear.

Footnotes: 
[1]  http://www.unix.org/single_unix_specification/

-- 
/!\ My mail address changed, please update your files accordingly.
 |      Michaėl `Micha' Cadilhac   |  Si les religions etaient aussi tole-  |
 |         Epita/LRDE Promo 2007   |  rantes qu'elles le pretendent, il y   |
 |  http://michael.cadilhac.name   |  a longtemps qu'il n'y en aurait plus  |
 `--  -   JID: micha@amessage.be --'           -- Moustic              -  --'