What is “rcs” Package?

GNU revision control system
For more details: https://www.gnu.org/software/rcs/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install rcs.

  brew install rcs

Now, use rcs!