# Created on savesnippets.com · https://savesnippets.com/WijqGSWfGiro2D
# Dry run — print what WOULD change
grep -rln "old_name" src/

# Replace in matching files (GNU sed)
find src -type f -name "*.py" -exec sed -i 's/old_name/new_name/g' {} +

# BSD/macOS sed: requires an extension arg for -i (use '' for no backup)
find src -type f -name "*.py" -exec sed -i '' 's/old_name/new_name/g' {} +

# Make a backup of every modified file (.bak extension)
find . -name "*.conf" -exec sed -i.bak 's/localhost/example.com/g' {} +

# Limit to files containing the pattern first (faster on large trees)
grep -rl "old_name" src/ | xargs sed -i 's/old_name/new_name/g'