A lot of solutions I’ve found for recursively replacing text in files is implemented using shell scripts, perl, php, or some other inconvenient way. Rushi got it right by using the Linux command line. Here it is (slightly modified) from his blog:
find . -name “*.cpp” -print | xargs sed -i ‘s/[find]/[replace]/g’
where “[find]” and “[replace]” are the things you are searching for and substituting.
To search files with multiple file extensions, use:
find . -name “*.cpp” -o -name “*.h” -o -name “*.c” | xargs sed -i ‘s/[find]/[replace]/g’
ADDED 4-13-2009: See comments for other variations.