title: GIT get the commit hash prior to a specific commit
body: <p>git 1.7.1</p>
  
  <p><code>git show &lt;hash&gt;:&lt;file&gt;</code> gives me the file based on the commit hash provided</p>
  
  <p>I am trying to figure out how to bet the file of the previous commit before the one who's hash I have.</p>
  
  <p>I know I can always use the <code>log</code> to get all hashes and figure out the one i need but that's not a good solution in my case as I am trying to minimise the number of commands I need to do for performance issues.</p>
  
  <p>Was wondering if there is a simple way.</p>