Open Terminal (in /Applications/Utilities), then paste one of the commands into Terminal and press Return. The commands in the list are the parts that begin with 'defaults,' such as: defaults write. For other applications, changing defaults is a nice way to change the behavior of an app so that it can be better suit user or business needs. Mac OS'x default commands can also be scripted. Since the default Mac admin of a server OS is a member of several admin groups (e.g. lpadmin, accessbpf, appserveradm etc) you might add them as well in the script. Example: add the following line to the script to add the user to the 'App Server Admins' group.
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The user account named ”root” is a superuser with read and write privileges to more areas of the system, including files in other macOS user accounts. The root user is disabled by default. If you can log in to your Mac with an administrator account, you can enable the root user, then log in as the root user to complete your task.
The root user account is not intended for routine use. Its privileges allow changes to files that are required by your Mac. To undo such changes, you might need to reinstall your system software. You should disable the root user after completing your task.
It's safer to use the sudo command in Terminal instead of enabling the root user. To learn about sudo, open the Terminal app and enter man sudo.
When the root user is enabled, you have the privileges of the root user only while logged in as the root user.
Remember to disable the root user after completing your task.