title: -bash: !": event not found
body: <p>How do I fix this bash terminal? Why would the '!' suddenly be a problem and the need for quotation marks are no longer seem to be necessary to produce the string. Did I break something? If so how do I reset it to factory setting? I'm sure it was working properly yesterday</p>
  
  <pre><code>Last login: Sat Oct 18 15:30:48 on ttys001
  Michels-MacBook-Pro:~ michelfrechette$ echo "hello, world!"
  -bash: !": event not found
  Michels-MacBook-Pro:~ michelfrechette$ echo hello, world
  hello, world
  Michels-MacBook-Pro:~ michelfrechette$ echo "hello, world"
  hello, world 
  </code></pre>
  
  <p><code>-bash: !": event not found</code>, this is curious.</p>