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From: Robert Mecklenburg <mecklen@cimsoft.com>
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Subject: Re: isearch-regexp-in-all-matching-files-in-tree?
Date: Tue, 15 Oct 2002 13:14:43 -0600
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TLR> Use case: I'm in a dired buffer in GNU Emacs 21.1.1 on w2k. I
TLR> want to _interactively_ search for the string 'GenericAction'
TLR> (and replace with 'ActionClass') in all files with names matching
TLR> '*.java' anywhere in the directory tree below the current
TLR> directory. 
TLR> 
TLR> How can I do this?

M-x find-dired <ret>			# Invoke find-dired
.					# on the current directory
-name '*.java'				# insert the *.java name pattern
-exec grep -q GenericAction {} \;	# edit the grep command

When the find command finishes mark all files as in any dired buffer.

Finally, use A (dired-do-search) to search them interactively.

Hope this helps,
-- 
Robert