bat — cat with syntax highlighting and line numbers

You open a source file just to read it, and plain cat gives you a wall of unformatted text.

On Debian/Ubuntu, most of these tools are also one sudo apt install away.

brew install bat   # install
bat main.py        # try: view any source file

Good to know

bat pipes code through highlighting, line numbers, and git markers. Once you use it, plain cat feels broken.