-rwxr-xr-x 1 root root 568920 5 dic 21:42 /bin/zsh -rwxr-xr-x 1 root root 568920 5 dic 21:42 /bin/zsh-4.3.4 I'm not sure why not just sym (or hard) linking those..
I've removed the versioned binary for now. It's a hardlink but merging makes it a copy.