title: How to tell if homebrew is installed on Mac OS X
body: <p>I am doing some Rails programming and I consistently see Homebrew referenced in solutions around the web but have never used it.</p>
  
  <p>I also notice Homebrew in the terminal version 2.9 as an option next to "Shell -> New" from the terminal drop down but when I select homebrew and issue commands, they fail. </p>
  
  <p>Usually with the "command not found" error.</p>
  
  <p>Strangely enough I have been unable to locate a simple command to determine whether brew is installed or not.</p>
  
  <p>How do I check to see if Homebrew is already installed on my Mac?</p>