title: sudo: apt-get: command not found
body: <p>I am really struggling to get my head around terminal i keep getting commands not found what am i doing wrong?</p>
  
  <p>I am trying to install ruby on the mac using this tutorial.
  <a href="http://www.ruby-lang.org/en/downloads/" rel="noreferrer">http://www.ruby-lang.org/en/downloads/</a></p>
  
  <p>but i keep getting the error sudo: apt-get: command not found</p>
  
  <pre><code>Ben-Easts-iMac:~ Ben$ sudo
  usage: sudo [-n] -h | -K | -k | -L | -V | -v
  usage: sudo -l[l] [-AnS] [-g groupname|#gid] [-U username] [-u username|#uid]
              [-g groupname|#gid] [command]
  usage: sudo [-AbEHnPS] [-C fd] [-g groupname|#gid] [-p prompt] [-u
              username|#uid] [-g groupname|#gid] [VAR=value] [-i|-s] [&lt;command&gt;]
  usage: sudo -e [-AnS] [-C fd] [-g groupname|#gid] [-p prompt] [-u
              username|#uid] file ...
  Ben-Easts-iMac:~ Ben$ sudo apt-get install ruby1.9.1-full
  Password:
  sudo: apt-get: command not found
  Ben-Easts-iMac:~ Ben$ sudo apt-get install ruby-full
  sudo: apt-get: command not found
  Ben-Easts-iMac:~ Ben$ sudo apt-get install ruby-full
  sudo: apt-get: command not found
  Ben-Easts-iMac:~ Ben$ sudo find / -name "apt-get" -print
  find: /dev/fd/3: Not a directory
  find: /dev/fd/4: Not a directory
  sudo which apt-get
  </code></pre>
  
  <p>Can some please help me or give me an option to try to debug.</p>
  
  <p>thanks</p>