How to Do Setup Assisant Again on Mac
When y'all get-go start using a brand-new Mac or performed a make clean install of OS X, yous are presented with Setup Banana, allowing you to create the first user account and specify some initial information, such as keyboard layout and locale.
Under certain circumstances, it can be advantageous to re-run the Setup Banana. Using some control-line trickery, we tin do just this without having to erase and reinstall OS Ten.
What Setup Assistant Does
Setup Banana is designed to run on the kickoff boot of a fresh install of Bone 10, which is why you'll but run across it when booting up a a brand-new Mac or i that has been erased and had Bone X reinstalled.
Besides options for keyboard layout, fourth dimension zone and asking if you'd like to register, Setup Assistant too lets you create a new user account. As Setup Assistant assumes the account it is creating to be the first, it is always given administrator privileges.
Why Carp?
There may come a time when you lot need to set upwardly a second user account on a Mac while attempting to resolve a user account result. If a Mac has only ane user account and it seems to be unable to log in correctly (getting stuck at the login window, for example), having a 2d account will let you to access Bone X and continue troubleshooting.
By re-running Setup Assistant, we can use the process to create a user account that will automatically have ambassador privileges, without having to do then via System Preferences, which we might not be able to access.
In that location are other reasons why re-running it can be advantageous, though in my experience, the to a higher place has always been the most common reason to do so. Sure, y'all can create user accounts using a number of commands, but Setup Assistant is only far easier.
.AppleSetupDone
Every time OS X boots, it checks for the existence of a file known as .AppleSetupDone. This empty file is created after the completion of Setup Assistant. It doesn't exist on a brand-new, out-of-the-box Mac, nor on i that has had a clean installation of OS X.
Past removing this file, Os X volition assume that Setup Assistant has never been run and volition launch information technology as soon as Os X boots.
Setup Assistant is also run with root privileges, which is why it tin can create a new user business relationship with administrator privileges without the demand for whatsoever authorisation.
Removing .AppleSetupDone
To remove this file, nosotros demand to boot the Mac into Single-User Mode. This provides a method of interacting with OS X via the command-line, with total root privileges.
Start upwardly the Mac whilst holding downwardly ⌘-S. After a few moments, you'll come across the Mac boot to the command line.
Before continuing, the filesystem must be checked and mounted, so files are't immediately accessible to interact with. To do this, enter the two commands that are displayed inside the prompt, 1 at a fourth dimension.
The following command will check the filesystem to ensure there are no bug. Enter:
/sbin/fsck -fy The side by side command will then mount the filesystem for it to be accessible:
/sbin/mount -uw / With the filesystem mounted and accessible, it's time to remove the file so OS X will re-run Setup Banana:
rm /var/db/.AppleSetupDone 
After that, simply enter reboot and your Mac will restart and boot normally. Merely this fourth dimension, Setup Banana will launch.
Security Concerns
By now, you're probably wondering why should this exist fifty-fifty possible, since someone may use this to gain access to a Mac. Indeed, re-running Setup Assistant would certainly permit for an unauthorised person to create a new account with administrative privileges and gain access to the Mac along with your data.
In terms of security, physical access trumps almost every method of preventing unauthorised admission non involving encryption. While a little more complicated with the SSD engineering Apple uses in their product lines, access to your data can hands be done simply by removing the Mac's storage device and connecting information technology to another.
This is where encryption methods such as Firmware Password and FileVault ii are useful. With a Firmware Password ready, it must be entered if the Mac is being booted either into Single-User Mode or to another kick volume. FileVault 2 takes this one step farther by performing total disk encryption, preventing any grade of access to your data unless authorised by inbound your user account password - even if the drive is removed and attached to another Mac.
Source: http://www.theinstructional.com/guides/how-to-re-run-the-os-x-setup-assistant
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