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uname(1) [freebsd man page]

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

NAME
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(1P)						     POSIX Programmer's Manual							 UNAME(1P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
uname - return system name SYNOPSIS
uname [-snrvma] DESCRIPTION
By default, the uname utility shall write the operating system name to standard output. When options are specified, symbols representing one or more system characteristics shall be written to the standard output. The format and contents of the symbols are implementation- defined. On systems conforming to the System Interfaces volume of IEEE Std 1003.1-2001, the symbols written shall be those supported by the uname() function as defined in the System Interfaces volume of IEEE Std 1003.1-2001. OPTIONS
The uname utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines. The following options shall be supported: -a Behave as though all of the options -mnrsv were specified. -m Write the name of the hardware type on which the system is running to standard output. -n Write the name of this node within an implementation-defined communications network. -r Write the current release level of the operating system implementation. -s Write the name of the implementation of the operating system. -v Write the current version level of this release of the operating system implementation. If no options are specified, the uname utility shall write the operating system name, as if the -s option had been specified. OPERANDS
None. STDIN
Not used. INPUT FILES
None. ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of uname: LANG Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.) LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables. LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments). LC_MESSAGES Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error. NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES . ASYNCHRONOUS EVENTS
Default. STDOUT
By default, the output shall be a single line of the following form: "%s ", <sysname> If the -a option is specified, the output shall be a single line of the following form: "%s %s %s %s %s ", <sysname>, <nodename>, <release>, <version>, <machine> Additional implementation-defined symbols may be written; all such symbols shall be written at the end of the line of output before the <newline>. If options are specified to select different combinations of the symbols, only those symbols shall be written, in the order shown above for the -a option. If a symbol is not selected for writing, its corresponding trailing <blank>s also shall not be written. STDERR
The standard error shall be used only for diagnostic messages. OUTPUT FILES
None. EXTENDED DESCRIPTION
None. EXIT STATUS
The following exit values shall be returned: 0 The requested information was successfully written. >0 An error occurred. CONSEQUENCES OF ERRORS
Default. The following sections are informative. APPLICATION USAGE
Note that any of the symbols could include embedded <space>s, which may affect parsing algorithms if multiple options are selected for out- put. The node name is typically a name that the system uses to identify itself for inter-system communication addressing. EXAMPLES
The following command: uname -sr writes the operating system name and release level, separated by one or more <blank>s. RATIONALE
It was suggested that this utility cannot be used portably since the format of the symbols is implementation-defined. The POSIX.1 working group could not achieve consensus on defining these formats in the underlying uname() function, and there was no expectation that this vol- ume of IEEE Std 1003.1-2001 would be any more successful. Some applications may still find this historical utility of value. For example, the symbols could be used for system log entries or for comparison with operator or user input. FUTURE DIRECTIONS
None. SEE ALSO
The System Interfaces volume of IEEE Std 1003.1-2001, uname() COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 UNAME(1P)

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