Allied Telesis AT-S97 - Manual (Page 210)

Chapter 13: Manager Account Commands
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This command changes the privilege level of the manager account “Smith”
to read-write:
user set username=Smith priviledge=readwrite
This command changes the password and privilege level of the “Tom
Adams” account:
user set username="Tom Adams" password priviledge=read
This command changes the password of the “Owen” account:
user set username=Owen password