As far as I you cannot undo commands issued on the command line. This feature 
seems to be mostly targeted towards the builder interface or some other 
interactive features. For 'newbies' I would recommend opening up a session, 
starting to work on your presentation and saving frequently. That way you have 
a fallback. However it is much easier in the long run to invest some time and 
building the presentation with a script. A good way to do that would be to have 
a clear picture in mind what kind of presentation to make, then enable logging 
and work your way through your presentation, can be combined with sessions as 
well. You can use the log file as a starting point for a pml (not python based) 
script. 

-----Original Message-----
From: Brenton Horne [mailto:brentonho...@ymail.com] 
Sent: Tuesday, January 06, 2015 10:44 PM
To: pymol-users@lists.sourceforge.net
Subject: [PyMOL] How do I undo my last command I executed in the PyMOL command 
line and viewer?

Hi,

I thought that running "undo" from the PyMOL command line would do this but it 
didn't do anything that I could see visually in the viewer. I've also tried 
going to Edit->Undo and it didn't do anything visually apparent in the viewer.

Thanks for your time,
Brenton

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