Getting root access in OSX is a task that stumps a lot of new users. Ideally you shouldn’t need root at all, sudo should be enough. But sometimes you just need root. Here’s how to enable the root user in OSX Tiger.

Enable Root1-2
First, open up NetInfo Manager in the Utilities folder.
Enable Root2-1
Next click the lock to authenticate yourself, you will need to have administrative rights.
Enable Root3
Select Enable Root User from the Security drop-down menu. You may be asked to authenticate yourself once more.
Now that you have enabled the root user, you will probably want to change it’s default password. In most cases the root user’s password is either blank, or the first administrative user for this computer’s password.
Enable Root4
Back in the Security drop-down menu, select Change Root Password
Enable Root5
Enter the previous root password once, the new one twice.
You can now become the root user from the command line by typing su and your new root password.

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