Parameters not available for quick shutdown in the command line

Parameters not available for quick shutdown on the command line-Linux general technology-Linux technology and application information. The following is a detailed description. I am a beginner in Linux and use Fedora. I can see that the hard disk may be damaged when the power source is directly shut down without using the command to shut down Linux. After I practiced this command multiple times, I found that no parameters were introduced in the teaching material. Shutdown-h-n now (this command I understand is: the current rapid shutdown without going through init, power off after shutdown) and changing the now parameter to 0 can also play this role. Shutdown-h-n 0 (I understand this command: Shut down the system quickly in zero minutes, and shut down the power after shutdown ). If you are interested, try it.