I have a file that I'm going to be editing and then saving multiple copies of so that I can run them in a model I'm using.

Having edited the file I now don't seem to be able to save it under a different name.

gedit NAMELIST.IN &

(I then edited the text within the file)

I definitely need the original file back. I can't any nice simple GUI button thing at the top of the window(?) for this. Is there a command line way to do this nice and neatly?

Ideally I'd like to save the file as

TMB_RUN_1_NAMELIST.IN

EDIT*** Save as is greyed out. However, the shortcut Crtl+Shift+S is working? And I've found that I can save it by right clicking on the gedit tab.

Any thoughts on why Save As might be greyed out and how I might be able to look at that would be welcome. ***EDIT