[tlug] bash and grep and diff

[Darren Cook <darren@example.com>]

I often want to run diff on just a subset of two files. I.e.
  grep "ABC" a.txt >tmp1.txt
  grep "ABC" b.txt >tmp2.txt
  diff tmp1.txt tmp2.txt

Is there a way to do that in a single line, without having to create
temp files?  (From a bash commandline, if at all possible.)  (There is
only one stdin pipe, so I'm guessing not, but thought it wouldn't hurt
to ask...)

Darren


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