BASH
Find and Replace Text Across Multiple Files
Efficiently find and replace specific text strings within multiple files in a directory or project using a combination of `find` and `sed`.
find . -type f -name "*.txt" -exec sed -i 's/old_string/new_string/g' {} +
How it works: This command uses `find` to locate all regular files (`-type f`) with a `.txt` extension (`-name "*.txt"`) in the current directory and its subdirectories. For each found file, `sed -i` is executed to perform an in-place (`-i`) global (`/g`) substitution (`s/old_string/new_string/`) of "old_string" with "new_string". This is invaluable for mass configuration updates or refactoring.