uname

Print details about the current machine and the operating system running on it. Note: If you're on Linux, try also the lsb_release command.

Print hardware-related information: machine and processor:

uname -mp

Print software-related information: operating system, release number, and version:

uname -srv

Print the nodename (hostname) of the system:

uname -n

Print all available system information (hardware, software, nodename):

uname -a