title: Bash select random string from list
body: <p>I have a list of strings that I want to select one of them at random each time I launch the script.</p>
  
  <p>For example</p>
  
  <pre><code>SDF_BCH_CB="file1.sdf"
  SDF_BCH_CW="file2.sdf"
  SDF_BCH_RCB="file3.sdf"
  SDF_BCH_RCW="file4.sdf"
  SDF_TT="file5.sdf"
  </code></pre>
  
  <p>Then I want to be randomly select from the above list to assign the following two variables.</p>
  
  <pre><code>SDFFILE_MIN=$SDF_BCH_CW
  SDFFILE_MAX=$SDF_TT
  </code></pre>
  
  <p>How can I do this ?</p>
  
  <p>Thanks</p>