Manual Pages  — UNAME

uname – get system identification

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ENVIRONMENT ERRORS SEE ALSO STANDARDS HISTORY

Standard C Library (libc, -lc)

#include <sys/utsname.h>

int
uname(struct utsname *name);

The uname() function stores NUL-terminated strings of information identifying the current system into the structure referenced by name.

The utsname structure is defined in the <sys/utsname.h> header file, and contains the following members:

sysname	Name of the operating system implementation.
nodename	Network name of this machine.
release	Release level of the operating system.
version	Version level of the operating system.
machine	Machine hardware platform.

The uname function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

UNAME_s
	If the environment variable UNAME_s is set, it will override the sysname member.
UNAME_r
	If the environment variable UNAME_r is set, it will override the release member.
UNAME_v
	If the environment variable UNAME_v is set, it will override the version member.
UNAME_m
	If the environment variable UNAME_m is set, it will override the machine member.

The uname() function conforms to IEEE Std 1003.1-88 ("POSIX.1").

The uname() function first appeared in BSD 4.4 .