Do I have to use the Web-Based System Manager graphical user interface of HMC?
No, many of the day-to-day operational command line functions are available on the HMC, accessible from a remote system by using the rexec command or the OpenSSH command. A number of the more complex HMC functions can only be accessed through the Web-Based System Manager interface because they would be very complicated to use in command line form.
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