In-place edit sed

Modify file in-place (no backup); on macOS add empty string: -i ''

sed -i 's/old/new/g' config.cfg

#sed #linux

more sed all 15 commands →

In-place edit with backup sed -i.bak 's/old/new/g' file.txt Delete matching lines sed '/^#/d' config.txt Delete blank lines sed '/^[[:space:]]*$/d' file.txt Print specific line numbers sed -n '10,20p' file.txt Print lines matching pattern sed -n '/ERROR/p' app.log