Ok it’s rare that I need to do this from the command line but it’s possible from the vMA:
Shutdown host:
vicfg-hostops --server server_name --username user_name --password pass_word --operation shutdown
Reboot host:
vicfg-hostops --server server_name --username user_name --password pass_word --operation reboot
Enter Maintenance mode:
vicfg-hostops --server server_name --username user_name --password pass_word --operation enter
Exit Maintenance mode:
vicfg-hostops --server server_name --username user_name --password pass_word --operation exit
Info on Maintenance mode:
vicfg-hostops --server server_name --username user_name --password pass_word --operation info