xref: /freebsd/usr.bin/uname/uname.1 (revision d65cd7a57bf0600b722afc770838a5d0c1c3a8e1)
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28.\"	@(#)uname.1	8.3 (Berkeley) 4/8/94
29.\" $FreeBSD$
30.\"
31.Dd June 27, 2019
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 abiKmnoprsUv
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 b
57Write the kernel's linker-generated build-id to standard output.
58.It Fl i
59Write the kernel ident to standard output.
60.It Fl K
61Write the
62.Fx
63version of the kernel.
64.It Fl m
65Write the type of the current hardware platform to standard output.
66.Po Xr make 1
67uses it to set the
68.Va MACHINE
69variable.
70.Pc
71.It Fl n
72Write the name of the system to standard output.
73.It Fl o
74This is a synonym for the
75.Fl s
76option, for compatibility with other systems.
77.It Fl p
78Write the type of the machine processor architecture to standard output.
79.Po Xr make 1
80uses it to set the
81.Va MACHINE_ARCH
82variable.
83.Pc
84.It Fl r
85Write the current release level of the operating system
86to standard output.
87.It Fl s
88Write the name of the operating system implementation to standard output.
89.It Fl U
90Write the
91.Fx
92version of the user environment.
93.It Fl v
94Write the version level of this release of the operating system
95to standard output.
96.El
97.Pp
98If the
99.Fl a
100flag is specified, or multiple flags are specified, all
101output is written on a single line, separated by spaces.
102.Pp
103The
104.Fl K
105and
106.Fl U
107flags are intended to be used for fine grain differentiation of incremental
108.Fx
109development and user visible changes.
110.Sh ENVIRONMENT
111An environment variable composed of the string
112.Ev UNAME_
113followed by any flag to the
114.Nm
115utility (except for
116.Fl a )
117will allow the corresponding data to be set to the contents
118of the environment variable.
119.Sh EXIT STATUS
120.Ex -std
121.Sh EXAMPLES
122The hardware platform
123.Pq Fl m
124can be different from the machine's processor architecture
125.Pq Fl p ,
126e.g., on 64-bit PowerPC,
127.Fl m
128would return
129.Va powerpc
130and
131.Fl p
132would return
133.Va powerpc64 .
134.Sh SEE ALSO
135.Xr feature_present 3 ,
136.Xr getosreldate 3 ,
137.Xr sysctl 3 ,
138.Xr uname 3 ,
139.Xr sysctl 8
140.Sh STANDARDS
141The
142.Nm
143command is expected to conform to the
144.St -p1003.2
145specification.
146.Sh HISTORY
147The
148.Nm
149command appeared in PWB UNIX 1.0, however
150.Bx 4.4
151was the first Berkeley release with the
152.Nm
153command.
154.Pp
155The
156.Fl K
157and
158.Fl U
159extension flags appeared in
160.Fx 10.0 .
161The
162.Fl b
163extension flag appeared in
164.Fx 13.0 .
165