or use BulkReplacer" - Wilbur
grep -ril 'search' | xargs sed -i 's/search/replace/g'
Wilbur is a skilled web designer, product manager, OSX developer and marketing influencer. He's known for his love of vegan food, clean design and elegant typography. Colleagues say his memory is better than an elephant. When he's not busy devoting his time to work, he can be found in his bowl with his girl-fish.
Leon did the rest because Wilbur is a goldfish.