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SubjectRe: How can I know the number of current users in the system?
In a message dated 11/6/01 8:01:08 AM Eastern Standard Time, 
nikberry@med.umich.edu writes:

> Basically once Unix went beyond serial terminals connected to dumb serial
> ports, we lost the ability to track users.

I would have phrased the comment somewhat different.

Once Unix adopted the process and file I/O abstraction,
a system wide user count became meaningless.

Unix should be contrasted with Primos or VMS where the
user memory space or program and serial terminal I/O
are used in defining the multiuser time-sharing capabilities
of the system.

Joachim Martillo
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