Shutdown command in Red Hat Linux

Shutdown-H now cannot be used. The screen only displays the shutdown usage.

 

Shutdown is a command for shutdown. in Linux, parameters must be included. For example, shutdown-H now is a command for immediate shutdown. However, when running such a command on a terminal, Linux does not shut down sometimes, after reading a lot of information, I finally saw that it was not just a problem with the root user. I had to switch the user to the root user and use Su-root to enter the password, run shutdown-H now again, and the desired result is displayed. Linux is shut down.