title: How to specify a default param in unix?
body: <p>Say I have the function shoutout inside my <code>.profile</code> file.
  When I run <code>shoutout 'Hello'</code>, the function prints out <code>Hello</code>, which is the expected response. However, I'd like to be able to simply call <code>shoutout</code> with no parameters and have the function print out <code>Foobar</code>.</p>
  
  <p>How do I specify a default value for $1 with or without variables? Thanks!</p>
  
  <pre><code>shoutout() {
      echo $1
  }
  </code></pre>