Installation Steps:

  1. Open Terminal using Spotlight search by pressing  <command+space>.
    Type terminal and hit  Enter key.
  2. Now, run
    ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” < /dev/null 2> /dev/null
  3. Install diffutils using brew
    brew instalI diffutils

diffutils is ready to use now!