uname -- print the name of the operating system


uname [ -aAmnrsvX ]

uname [ -S node_name ]


The uname command prints the name of the operating system to the standard output.

The various options to uname return selected information that is available with the uname(S) system call:

Print all the information corresponding to the options -s, -n, -r, -v, and -m.

Print the license field (activation state) information.

Print the machine hardware name.

Print the machine's node name; the name by which it is known to a communications network.

Print the operating system release.

Print the operating system name (the default action of uname). Note that this option is affected if the UNAME_OLD environment variable is set (see warning below).

-S node_name
Change the machine's node name to node_name. Note that only root is allowed to change the node name. This option does not change the operating system name.

The format of node_name is restricted to 8 characters from the set of lowercase letters, numeric digits, dash ``-'', and underscore ``_''; the name may not begin with a digit.

Print the operating system version number. Note that this option changes if the UNAME_OLD environment variable is set (see warning below).

Print information about system name, node name, operating system release number, kernel ID, processor type, bus type, serial number, number of users license (2-user, 8-user or unlimited), OEM number, origin number, and number of CPUs.


Previous releases of uname and uname(S) returned the machine's node name if no command line option was specified. This may cause existing application scripts and binaries to fail under this release.

Previous releases of SCO OpenServer also incorrectly displayed the node name in place of the system name, and always displayed a version number of "2". Older application scripts may depend on this incorrect behavior. If the environment variable UNAME_OLD exists, uname(C) displays the system name as the node name and the operating system version as "2".

Open UNIX 8 compatibility notes

When running ACP on Open UNIX 8 and UnixWare 7 systems, set OSRCMDS=on to use the SCO OpenServer version of the <uname> command. This provides the expected behaviors for SCO OpenServer applications. The SCO OpenServer version of this command is also provided on Open UNIX 8 systems under the OSP feature See the Running SCO OpenServer Applications topic in the Open UNIX 8 documentation set.

See also


Standards conformance

uname is conformant with:

ISO/IEC DIS 9945-2:1992, Information technology - Portable Operating System Interface (POSIX) - Part 2: Shell and Utilities (IEEE Std 1003.2-1992);
AT&T SVID Issue 2;
X/Open CAE Specification, Commands and Utilities, Issue 4, 1992.

© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003