uname

uname --help
Usage: uname [OPTION]...
Print certain system information. With no OPTION, same as -s.（默认选项为-s）

-a, --all print all information, in the following order,
except omit -p and -i if unknown:
-s, --kernel-name print the kernel name
-n, --nodename print the network node hostname
-r, --kernel-release print the kernel release
-v, --kernel-version print the kernel version
-m, --machine print the machine hardware name
-p, --processor print the processor type (non-portable)
-i, --hardware-platform print the hardware platform (non-portable)
-o, --operating-system print the operating system
--help display this help and exit
--version output version information and exit

GNU coreutils online help: http://www.gnu.org/software/coreutils/
Report uname translation bugs to http://translationproject.org/team/
Full documentation at: http://www.gnu.org/software/coreutils/uname
or available locally via: info '(coreutils) uname invocation'