2004-11-03 13:51:07 +00:00
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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2007-06-20 22:33:04 +00:00
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.TH "UNAME" 1P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.\" uname
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2007-09-20 06:03:25 +00:00
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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2004-11-03 13:51:07 +00:00
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.SH NAME
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uname \- return system name
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.SH SYNOPSIS
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.LP
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\fBuname\fP \fB[\fP\fB-snrvma\fP\fB]\fP
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.SH DESCRIPTION
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.LP
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By default, the \fIuname\fP utility shall write the operating system
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name to standard output. When options are specified,
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symbols representing one or more system characteristics shall be written
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to the standard output. The format and contents of the
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symbols are implementation-defined. On systems conforming to the System
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Interfaces volume of IEEE\ Std\ 1003.1-2001, the
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symbols written shall be those supported by the \fIuname\fP() function
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as defined in the
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System Interfaces volume of IEEE\ Std\ 1003.1-2001.
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.SH OPTIONS
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.LP
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The \fIuname\fP utility shall conform to the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
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.LP
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The following options shall be supported:
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.TP 7
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\fB-a\fP
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Behave as though all of the options \fB-mnrsv\fP were specified.
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.TP 7
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\fB-m\fP
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Write the name of the hardware type on which the system is running
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to standard output.
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.TP 7
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\fB-n\fP
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Write the name of this node within an implementation-defined communications
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network.
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.TP 7
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\fB-r\fP
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Write the current release level of the operating system implementation.
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.TP 7
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\fB-s\fP
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Write the name of the implementation of the operating system.
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.TP 7
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\fB-v\fP
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Write the current version level of this release of the operating system
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implementation.
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.sp
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.LP
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If no options are specified, the \fIuname\fP utility shall write the
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operating system name, as if the \fB-s\fP option had been
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specified.
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.SH OPERANDS
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.LP
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None.
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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None.
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.SH ENVIRONMENT VARIABLES
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.LP
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The following environment variables shall affect the execution of
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\fIuname\fP:
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.TP 7
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\fILANG\fP
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Provide a default value for the internationalization variables that
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are unset or null. (See the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
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for
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the precedence of internationalization variables used to determine
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the values of locale categories.)
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.TP 7
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\fILC_ALL\fP
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If set to a non-empty string value, override the values of all the
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other internationalization variables.
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.TP 7
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\fILC_CTYPE\fP
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Determine the locale for the interpretation of sequences of bytes
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of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).
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.TP 7
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\fILC_MESSAGES\fP
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Determine the locale that should be used to affect the format and
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contents of diagnostic messages written to standard
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error.
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.TP 7
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\fINLSPATH\fP
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Determine the location of message catalogs for the processing of \fILC_MESSAGES
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\&.\fP
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.sp
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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By default, the output shall be a single line of the following form:
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.sp
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.RS
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.nf
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\fB"%s\\n", <\fP\fIsysname\fP\fB>
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\fP
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.fi
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.RE
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.LP
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If the \fB-a\fP option is specified, the output shall be a single
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line of the following form:
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.sp
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.RS
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.nf
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\fB"%s %s %s %s %s\\n", <\fP\fIsysname\fP\fB>, <\fP\fInodename\fP\fB>, <\fP\fIrelease\fP\fB>,
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<\fP\fIversion\fP\fB>, <\fP\fImachine\fP\fB>
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\fP
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.fi
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.RE
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.LP
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Additional implementation-defined symbols may be written; all such
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symbols shall be written at the end of the line of output
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before the <newline>.
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.LP
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If options are specified to select different combinations of the symbols,
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only those symbols shall be written, in the order
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shown above for the \fB-a\fP option. If a symbol is not selected for
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writing, its corresponding trailing <blank>s also shall
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not be written.
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.SH STDERR
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.LP
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The standard error shall be used only for diagnostic messages.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The following exit values shall be returned:
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.TP 7
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\ 0
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The requested information was successfully written.
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.TP 7
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>0
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An error occurred.
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.sp
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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Note that any of the symbols could include embedded <space>s, which
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may affect parsing algorithms if multiple options are
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selected for output.
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.LP
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The node name is typically a name that the system uses to identify
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itself for inter-system communication addressing.
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.SH EXAMPLES
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.LP
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The following command:
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.sp
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.RS
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.nf
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\fBuname -sr
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\fP
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.fi
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.RE
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.LP
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writes the operating system name and release level, separated by one
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or more <blank>s.
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.SH RATIONALE
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.LP
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It was suggested that this utility cannot be used portably since the
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format of the symbols is implementation-defined. The
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POSIX.1 working group could not achieve consensus on defining these
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formats in the underlying \fIuname\fP() function, and there was no
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expectation that this volume of
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IEEE\ Std\ 1003.1-2001 would be any more successful. Some applications
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may still find this historical utility of value. For
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example, the symbols could be used for system log entries or for comparison
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with operator or user input.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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The System Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIuname\fP()
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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