title: Changing Prompt from Shell Script?
body: <p>I'm new to shell scripting and can't for the life of me figure out why this isn't working.</p>
  
  <p>I'm trying to change the prompt from inside my shell script. It works when I type it into the terminal, but does nothing when I run the script and choose it from the menu.  Here's what I have:</p>
  
  <pre><code>read input   
  case $input in   
  1)    oldprompt=$PS1  
  export PS1="\d \t"    
  ;;  
  2) echo "option 2"  
  ;;  
  *) echo "option 3"  
  ;;   
  esac   
  </code></pre>