Just a reminder: installing this will enable System Integrity Protection (aka rootless, prevents even root from modifying system files), but it can be disabled by rebooting into recovery mode and selecting Utilities -> Security Configuration.
Edit: Actually, some webpage says that the method was changed in a later beta. Let me actually do the update and see how it works now...
And that bash 3.2 is one of the reasons I want to turn off rootless so I can install modern bash 4.3 in /bin/bash, so that scripts that have #/bin/bash continue to work unmodified.
Apple will most likely never update their bash to GPL 3.0 bash 4 or later.
It's easy to change your default shell, but if you got a shell script that explicitly specifies #!/bin/sh (and they all do) then /bin/sh will be invoked, regardless what your default shell is. So your options are to modify every script file to invoke your default shell (usually #!/usr/local/bin/sh ) or to install your default shell in /bin.
What's the definition of system files in this context? I run ssh on alternate port by editing /System/Library/LaunchDaemons/ssh.plist . Will that not be editable anymore or is this applicable to executables only?
Edit: Actually, some webpage says that the method was changed in a later beta. Let me actually do the update and see how it works now...