/usr.bin/uname/uname.1

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 28.\"	@(#)uname.1	8.3 (Berkeley) 4/8/94
 29.\" $FreeBSD$
 30.\"
 31.Dd January 26, 2010
 32.Dt UNAME 1
 33.Os
 34.Sh NAME
 35.Nm uname
 36.Nd display information about the system
 37.Sh SYNOPSIS
 38.Nm
 39.Op Fl aimnoprsv
 40.Sh DESCRIPTION
 41The
 42.Nm
 43command writes the name of the operating system implementation to
 44standard output.
 45When options are specified, strings representing one or more system
 46characteristics are written to standard output.
 47.Pp
 48The options are as follows:
 49.Bl -tag -width indent
 50.It Fl a
 51Behave as though the options
 52.Fl m , n , r , s ,
 53and
 54.Fl v
 55were specified.
 56.It Fl i
 57Write the kernel ident to standard output.
 58.It Fl m
 59Write the type of the current hardware platform to standard output.
 60.It Fl n
 61Write the name of the system to standard output.
 62.It Fl o
 63This is a synonym for the
 64.Fl s
 65option, for compatibility with other systems.
 66.It Fl p
 67Write the type of the machine processor architecture to standard output.
 68.It Fl r
 69Write the current release level of the operating system
 70to standard output.
 71.It Fl s
 72Write the name of the operating system implementation to standard output.
 73.It Fl v
 74Write the version level of this release of the operating system
 75to standard output.
 76.El
 77.Pp
 78If the
 79.Fl a
 80flag is specified, or multiple flags are specified, all
 81output is written on a single line, separated by spaces.
 82.Sh ENVIRONMENT
 83An environment variable composed of the string
 84.Ev UNAME_
 85followed by any flag to the
 86.Nm
 87utility (except for
 88.Fl a )
 89will allow the corresponding data to be set to the contents
 90of the environment variable.
 91.Sh EXIT STATUS
 92.Ex -std
 93.Sh SEE ALSO
 94.Xr sysctl 3 ,
 95.Xr uname 3 ,
 96.Xr sysctl 8
 97.Sh STANDARDS
 98The
 99.Nm
100command is expected to conform to the
101.St -p1003.2
102specification.
103.Sh HISTORY
104The
105.Nm
106command appeared in PWB UNIX.