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UNAME(1) General Commands Manual UNAME(1) NAME uname -- display information about the system SYNOPSIS uname [-abiKmnoprsUv] DESCRIPTION The uname command writes the name of the operating system implementa- tion to standard output. When options are specified, strings repre- senting one or more system characteristics are written to standard out- put. The options are as follows: -a Behave as though the options -m, -n, -r, -s, and -v were speci- fied. -b Write the kernel's linker-generated build-id to standard out- put. -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. (make(1) uses it to set the MACHINE variable.) -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 stan- dard output. (make(1) uses it to set the MACHINE_ARCH variable.) -r Write the current release level of the kernel to standard out- put. freebsd-version(1) can be used to print the release level of the userland. -s Write the name of the operating system implementation to stan- dard 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 out- put is written on a single line, separated by spaces. The -K and -U flags are intended to be used for fine grain differentia- tion of incremental FreeBSD development and user visible changes. Note that when both of these two options are specified, regardless of their order, the kernel version would be printed first, followed by the user environment version. 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. See uname(3) for more information. EXIT STATUS The uname utility exits 0 on success, and >0 if an error occurs. EXAMPLES The hardware platform (-m) can be different from the machine's proces- sor architecture (-p), e.g., on 64-bit PowerPC, -m would return powerpc and -p would return powerpc64. SEE ALSO freebsd-version(1), 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 1.0, however 4.4BSD was the first Berkeley release with the uname command. The -K and -U extension flags appeared in FreeBSD 10.0. The -b exten- sion flag appeared in FreeBSD 13.0. FreeBSD 13.2 September 14, 2022 UNAME(1)
NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | EXIT STATUS | EXAMPLES | SEE ALSO | STANDARDS | HISTORY
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