Re: [tlug] bash and grep and diff

[Romeo Theriault <romeo.theriault@example.com>]

On Tue, Aug 10, 2010 at 20:28, Darren Cook <darren@example.com> wrote:

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...)

Does this meet your criteria?

 diff <(grep "ABC" a.txt) <(grep "ABC" b.txt)

Wish I could take credit but was found here:

http://serverfault.com/questions/14212/how-can-i-diff-two-config-files

-- 
Romeo Theriault