uname -a is a Linux or Unix command.
This command returns information about the operating system, which you are using.
To produce a uname, access your Linux or Unix system's command line.
Then, execute the following command:
uname -a
Finally, provide the information which it returns.
For instance:
Linux nkhatam 2.2.5-16 #1 Tue Apr 27 04:55:03 EDT 1999 alpha unknown