shutdown(8) Versus haltsys(8)

[Andy Piziali]

There are two system administrator programs available to terminate the
operating system under IBM Xenix 1.0, running on a PC-AT: haltsys and shutdown.
haltsys immediately sync's the disks and halts the system.  shutdown, which
requires an integer time argument (in minutes), takes a while to terminate the
OS even when the value zero is specified.

What are the exact differences between these two programs?  What does shutdown
do that haltsys does not?
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