How does a Linux system shut down a common user?

How does a Linux system shut down a common user?

Download and install the Ubuntu 14.04 server version. A common user is created during the installation process. After logging on to a common user, the shutdown, init, halt, and reboot commands cannot be executed, the system prompts that the root permission is required to execute these commands. No root user is created during installation. What can I do?

I found the answer through the search. I 'd like to share it with you. You can try it in the same situation as me.
The normal user login prompt is $

$ Vi sudo
Add a row
Bkjia ALL =/sbin/shutdown,/sbin/reboot,/sbin/halt
Save and exit. Execute:
$ Sudo-v

Use bkjia to log on and run
$ Sudo/sbin/shutdown
You can.

Remember: bkjia is your username. Do not write it as bkjia,

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