Stop typing the filename twice. Brace expansion handles it.

https://preview.redd.it/gm71zdrwuvkg1.png?width=2048&format=png&auto=webp&s=1907df78a57f36099950c0fef99102662fd05519

Stop typing the filename twice. Brace expansion handles it. Works on any file, any extension.

#Instead of

cp config.yml config.yml.bak

#Do

cp nginx.conf{,.bak}

cp .env{,.bak}

cp Makefile{,.$(date +%F)}

# That last one timestamps your backup automatically. You're welcome.