grep(s) on 4.x BSD

[Jim Haynes]

We just discovered on our system, which started life as 3BSD and
has been upgraded over the years to 4.3 (but not tahoe), that there
are a /usr/ucb/grep and a /bin/grep.  The /bin/grep seems to have
powers that the others don't, such as working with the expression
  '\(.*\)\1'
A 4.3 tahoe system seems to have only the /usr/ucb/grep, which does
not work with that expression.

Does anybody remember how we got into this mess and why?

haynes at ucscc.ucsc.edu
haynes at ucscc.bitnet
..ucbvax!ucscc!haynes

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