The chsysinfo command provides the ability to change the system
name, version, and release number strings kept in system data structures.
This is usually necessary only when installing applications
that were designed to run on predecessor operating systems.
You must be logged in as root to use this command.
Note that there are two methods for changing the system name for
applications, the SCOMPAT environment variable and the
The SCOMPAT environment
variable can be used to set system name and version returned by
the uname command.
The change applies only to the current process and its child
processes, and is sufficient for any legacy application that only uses
the command level interface to query the system name and version.
The chsysinfo command changes the values returned by
the uname command, and the system name, version, and
release returned by the confstr(S), sysinfo(S),
and uname(S) system calls.
This more pervasive change is required only if the application being
installed uses the above system calls to query the system name,
version, or release.
Because the changes made by chsysinfo are effective system
wide, they apply to all currently running applications and applications
started following the changes.
Applications that make use of confstr(S), sysinfo(S),
and uname(S) to determine the supported features of the
operating system may fail or behave unexpectedly.
Such Kernel OS "spoofing" should be kept to the minimum time possible
to complete the installation.
System information values should be reset to the default
values at the earliest convienent time.
Changes made by chsysinfo do not persist across a reboot of
Upon reboot, the system will always have the default system name and version
values specified in the file /etc/conf/pack.d/name/space.c.
The following options are supported and change the system name and
version as indicated to support application installation intended for
the following systems:
The intent of chsysinfo is to enable the installation of
applications that make install time checks for a particular
system name, version, or release via either command line utilities
or system calls.
The installation of an application might fail with an error indicating
that the installer detected an unsupported operating system version.
The chsysinfo command can be used to allow the application to
For example, if the installer requires a system version of "5.0.7",
you could do the following:
The first chsysinfo command changes the system name to
"SCO_SV", version to "5.0.7", and release to "3.2".
After the package is installed with custom, the second
chsysinfo command returns these parameters to the default
file containing the values for system name and version used at boot time