What does uname -a show?

• A. List of currently running processes.
• B. Kernel name, version, and system information for quick environment identification.
• C. Network configuration details.
• D. Hardware diagnostics results.

Answer: (B)

uname with the -a flag reveals basic system identity information that helps you quickly identify the environment. It shows the kernel name, hostname, kernel release and version, machine hardware name, processor type, hardware platform, and operating system. This is useful for confirming you’re on the expected kernel and architecture when troubleshooting or preparing software for a specific environment. For example, you might see something like Linux host 5.4.0-74-generic #83-Ubuntu SMP x86_64 GNU/Linux, which tells you the OS family, kernel version, and architecture at a glance.

The other common tasks described—listing running processes, showing network configuration, or displaying hardware diagnostics—are handled by different tools (ps/top for processes, ip/ifconfig for network, and lshw/dmidecode for diagnostics), not by uname.