On Fri, 2 Feb 2001, Niall O Broin wrote:
> Can anyone shed any light on why the above, at least on SuSE 6.4, are
> entirely separate programs ? As egrep is e.g functionally identical to grep
> -E and the man page for grep says
There are some differences according to the Mastering Regular Expressions
book (Page 63). The egrep prog allows for word boundaries (\< \>) though
grep seems to support backreferences but egrep does not.
It seems that while they may be functionally equivalent, they implement
the functions in a different manner. The grouping in grep seems to be \(\)
but in egrep it is (). Having to escape some characters in grep but not in
egrep could lead to very different results if the same string was tried on
both.
> This anomalous behaviour has just cost me a couple of blank CDs and more
> important, a couple of hours, so I'm pissed ! (Yes, I know it's my fault for
> making unjustified assumptions, but I'm still pissed !)
I bought PC Plus hoping to get Suse on DVD and it turns out to be a
frigging ISO and I have no CD Writer at the mo. I almost know how you
feel. :-)
Regards...jmcc
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