Multiple grep results buffers

Question

Let's say I want to grep word1 and word2.

If I use the grep command for word1 I get the results in the *grep* buffer. If I then use the grep command for word2 I loose the old results and get the word2 results in a new *grep* buffer.

I want two see the two grep buffers (for example *grep 1* and *grep 2*) at the same time: How to get this?

Answer 1

You can do this easily if you use library Grep+ (grep+.el).

Use + in your first *grep* buffer, followed by g. The + renames the first *grep* buffer by appending <N> (N=2,3,...) to it, and it opens a new buffer named *grep*. The g in that buffer then launches a new grep command there.

C-h k + tells you this:

+ runs the command grepp-new-grep-buffer, which is an interactive compiled Lisp function in grep+.el.

It is bound to +, menu-bar grep grepp-new-grep-buffer.

(grepp-new-grep-buffer)

Rename current grep buffer and switch to new buffer *grep*. Current buffer must be a grep buffer. It is renamed to *grep*<N>.

Answer 2

You can save the word1 result in some temporary file then do another grep for word2.

Answer 3

You can pipe your grep's with a double pipe ('||'). This might be a alternative.

 M-x grep 
 grep -nrH 'word1' ||  grep -nrH 'word2'

The results of word1 will appear and afterwards the results of word2. BUT, both in the same grep-buffer...