Question: how to reboot hmc from command line?
Answer: Ground work: Ip address or hostname of the HMC. hscroot password to access the HMC. ...  Reboot the HMC using command line. Login to the hmc with hscroot access. hmcshutdown -t now -r --> To reboot the HMC. Reboot the HMC using GUI mode. Login to the HMC GUI using hscroot user account. ...  Post check.