title: Edit shell script while it's running
body: <p>Can you edit a shell script while it's running and have the changes affect the running script?</p>
  
  <p>I'm curious about the specific case of a csh script I have that batch runs a bunch of different build flavors and runs all night.  If something occurs to me mid operation, I'd like to go in and add additional commands, or comment out un-executed ones.</p>
  
  <p>If not possible, is there any shell or batch-mechanism that would allow me to do this?</p>
  
  <p>Of course I've tried it, but it will be hours before I see if it worked or not, and I'm curious about what's happening or not happening behind the scenes.</p>