Managing Systems and Workgroups: A Guide for HP-UX System Administrators

Configuring a System
Controlling Access to a System
Chapter 3252
NOTE Access Control Lists are supported in JFS beginning with JFS 3.3, which
is included with HP-UX 11i. You can obtain JFS 3.3 for HP-UX 11.00
from the HP Software Depot, http://software.hp.com.
To see if JFS 3.3 is installed on an HP-UX 11.00 system, run
swlist -l fileset JFS
If JFS 3.3 is installed, the output will include a list of JFS file sets. If you
get an error message, JFS 3.3 is not installed.
Controlling Usage and Processes with Run-Levels
A run-level is an HP-UX state of operation in which a specific set of
processes is permitted to run. These processes and default run-levels are
defined in the file /etc/inittab.
The run-levels are:
Run-level s The operating mode system administrators use (often
called “single-user state”). This mode ensures that no
one else is on the system while you are performing
system maintenance tasks. In this run-level, the only
access to the system is through the system console by
the user root. The only processes running on the
system can be the shell on the system console,
background daemon processes started by /sbin/rc,
and processes that you invoke. Commands requiring an
inactive system (such as /sbin/fsck) should be run in
run-level s.
Run-level 1 Starts a subset of essential system processes; can also
be used to perform system administration tasks.
Run-level 2 The operating mode typically called “multiuser state”.
This mode allows all users to access the system.
Run-level 3 For NFS servers. In this mode, NFS file systems can be
exported, as required for NFS servers.
Run-level 4 For CDE users. In this mode, CDE is active. CDE is the
default desktop on HP-UX 10.30 and later.