Managing Users and Security
Guardian User’s Guide—425266-001
16-10
System Users
System Users
The system prevents access from unauthorized users. A group manager or super ID user
assigns each user a unique user name and user ID to each user. To log on to systems that
require passwords, a user must enter the user name or ID and the password.
NonStop™ Kernel system users fall into one of these classes, indicated by the user ID:
General users Log on to a system to run one or more specific applications such
as a text editor or manufacturing application. (General users are
sometimes called application users.)
Group managers Are responsible for members of a specific group on the system.
The user ID is n,255, where n is the number of the group.
System operators Perform various system functions such as managing system files,
disks, and other devices. The user is ID 255,n, where n is an
integer from 1 to 254.
Super ID users Can access files, processes, and devices for the entire system
with no restrictions. The user ID is 255,255.
Identifying System Users
Each system user has a unique user name and user ID in the form:
group-name.user-name
where group-name is the group to which the user belongs, and user-name identifies the
individual user within the group.
A user ID is a pair of integers in the form:
group-id,user-id
where group-id identifies the user’s group, and user-id identifies the user within the
group. Each integer is in the range 0 through 255.
All user names and user IDs are kept in a system file. During a logon procedure, the
system checks this file to ensure that the user name in the LOGON command is valid
and that the correct password, if required, is supplied.
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