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uname(1) [freebsd man page]

UNAME(1)						    BSD General Commands Manual 						  UNAME(1)

uname -- display information about the system SYNOPSIS
uname [-aiKmnoprsUv] DESCRIPTION
The uname command writes the name of the operating system implementation to standard output. When options are specified, strings represent- ing one or more system characteristics are written to standard output. The options are as follows: -a Behave as though the options -m, -n, -r, -s, and -v were specified. -i Write the kernel ident to standard output. -K Write the FreeBSD version of the kernel. -m Write the type of the current hardware platform to standard output. -n Write the name of the system to standard output. -o This is a synonym for the -s option, for compatibility with other systems. -p Write the type of the machine processor architecture to standard output. -r Write the current release level of the operating system to standard output. -s Write the name of the operating system implementation to standard output. -U Write the FreeBSD version of the user environment. -v Write the version level of this release of the operating system to standard output. If the -a flag is specified, or multiple flags are specified, all output is written on a single line, separated by spaces. The -K and -U flags are intended to be used for fine grain differentiation of incremental FreeBSD development and user visible changes. ENVIRONMENT
An environment variable composed of the string UNAME_ followed by any flag to the uname utility (except for -a) will allow the corresponding data to be set to the contents of the environment variable. EXIT STATUS
The uname utility exits 0 on success, and >0 if an error occurs. SEE ALSO
feature_present(3), getosreldate(3), sysctl(3), uname(3), sysctl(8) STANDARDS
The uname command is expected to conform to the IEEE Std 1003.2 (``POSIX.2'') specification. HISTORY
The uname command appeared in PWB UNIX. The -K and -U extension flags appeared in FreeBSD 10.0. BSD
November 20, 2013 BSD

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uname(1)							   User Commands							  uname(1)

uname - print name of current system SYNOPSIS
uname [-aimnprsvX] uname [-S system_name] DESCRIPTION
The uname utility prints information about the current system on the standard output. When options are specified, symbols representing one or more system characteristics will be written to the standard output. If no options are specified, uname prints the current operating sys- tem's name. The options print selected information returned by uname(2), sysinfo(2), or both. OPTIONS
The following options are supported: -a Prints basic information currently available from the system. -i Prints the name of the platform. -m Prints the machine hardware name (class). Use of this option is discouraged. Use uname -p instead. See NOTES section below. -n Prints the nodename (the nodename is the name by which the system is known to a communications network). -p Prints the current host's ISA or processor type. -r Prints the operating system release level. -s Prints the name of the operating system. This is the default. -S system_name The nodename may be changed by specifying a system name argument. The system name argument is restricted to SYS_NMLN characters. SYS_NMLN is an implementation specific value defined in <sys/utsname.h>. Only the super-user is allowed this capability. This change does not persist across reboots of the system. Use sys-unconfig(1M) to change a host's name per- manently. -v Prints the operating system version. -X Prints expanded system information, one information element per line, as expected by SCO UNIX. The displayed information includes: o system name, node, release, version, machine, and number of CPUs. o BusType, Serial, and Users (set to "unknown" in Solaris) o OEM# and Origin# (set to 0 and 1, respectively) EXAMPLES
Example 1 Printing the OS name and release level The following command: example% uname -sr prints the operating system name and release level, separated by one SPACE character. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of uname: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. SYSV3 This variable is used to override the default behavior of uname. This is necessary to make it possible for some INTERACTIVE UNIX Systems and SCO UNIX programs and scripts to work properly. Many scripts use uname to determine the SYSV3 type or the version of the OS to ensure software is compatible with that OS. Setting SYSV3 to an empty string will make uname print the following default values: nodename nodename 3.2 2 i386 The individual elements that uname displays can also be modified by setting SYSV3 in the following format: os,sysname,node,rel,ver,mach os Operating system (IUS or SCO). sysname System name. node Nodename as displayed by the -n option. rel Release level as displayed by the -r option. ver Version number as displayed by the -v option. mach Machine name as displayed by -m option. Do not put spaces between the elements. If an element is omitted, the current system value will be used. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
arch(1), isalist(1), sys-unconfig(1M), sysinfo(2), uname(2), nodename(4), attributes(5), environ(5), standards(5) NOTES
Independent software vendors (ISVs) and others who need to determine detailed characteristics of the platform on which their software is either being installed or executed should use the uname command. To determine the operating system name and release level, use uname -sr. To determine only the operating system release level, use uname -r. Notice that operating system release levels are not guaranteed to be in x.y format (such as 5.3, 5.4, 5.5, and so forth); future releases could be in the x.y.z format (such as 5.3.1, 5.3.2, 5.4.1, and so forth). In SunOS 4.x releases, the arch(1) command was often used to obtain information similar to that obtained by using the uname command. The arch(1) command output "sun4" was often incorrectly interpreted to signify a SunOS SPARC system. If hardware platform information is desired, use uname -sp. The arch -k and uname -m commands return equivalent values; however, the use of either of these commands by third party programs is dis- couraged, as is the use of the arch command in general. To determine the machine's Instruction Set Architecture (ISA or processor type), use uname with the -p option. SunOS 5.11 17 Sep 2003 uname(1)
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