El Capitan Mac: /usr/bin/login tries to run /bin/false Just upgraded from Yosemite to El Capitan, and I started out with an Emacs problem: it wouldn't launch from the Emacs.app icon, complaining that it couldn't find /bin/false.  I tracked this down to the fact Emacs.app was trying to run /usr/bin/login, the default for the "Terminal" app. 
I can switch "Terminal" to run /bin/bash, but that doesn't solve the Emacs.app problem or similar problems for any other apps that try to run /usr/bin/login.

It looks like I need to fix /usr/bin/login to run /usr/bin/false and not /bin/false, but I have no idea how.

I tried to trick the programs backwards,

sudo ln -s /usr/bin/false /bin/false 


and I get "Operation not permitted."  I tried

sudo cp /usr/bin/false /bin/false


and I get "Operation mot permitted."

I'm stuck looking for "the right answer" or for other work arounds.
I had the same problem, with emacs giving me "Error (use-package): exec-path-from-shell :init: Searching for program: no such file or directory, /bin/false" on startup.
However, I noticed that this only happens when running Emacs (installed from emacsformacosx) from the Dock or Spotlight. If I ran it from my Terminal, or by clicking on it in Applications in finder, it worked fine. 

After a restart, the problem was resolved. I suspect that Dock and Spotlight held on to my original default shell, and after a restart, they used the new value (changed from /bin/false to /bin/zsh).