I want to search a directory and replace all occurrences of a word in emacs [duplicate]

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Possible Duplicate:

Using Emacs to recursively find and replace in text files not already open

I am using emacs and want to replac开发者_C百科e a word (well, all functions called foo() to foobar()) for all occurrences in a directory of source files. What is the best way to do this?

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Burton's answer is as easy as it gets. Here's one way to do it in Emacs:

M-x dired fill in the directory you want to work in

* s marks all files in the directory

Q runs query-replace-regex on all marked files. Fill in the search regex and the replace string.

Type ! to replace all occurrences in each file. You will have to go back to save the changes though.

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From the shell:

sed -i 's/foo\(/foobar\(/g' *.c *.h

this will replace all instances of foo( with foobar(.