Here is a really good one "lsb_release -a" (larry sam bobby) at the command line
as Majongg says in the menu under system tools click on uxterm and try the commands;
when finished you can type "exit" to close the uxterm screen
For those users new to linux who are wondering what the "things to try" are that John test is suggesting, and where you type them in, they are "command line commands". They are similar to how we used to enter MS-DOS commands in the past, or perhaps you have used the "dosbox" that Windows supplies as an option to emulate MS-DOS.
Linux has something similar, but much more powerful, called the "terminal", which runs a powful "command line interpreter".
Note that this has -nothing- to do with the gOS option "run command", which is just there to start applications that are not included in the pull down menu's.
However, if you do not have the terminal as a program under the system menu, then "run command" is useful to start a terminal program, by executing the command "uxterm".
Now a command line terminal window will open, if you click in it you can enter commands like "uname" etc.
Try it, but remember the command line terminal is a very powerful tool, and its possible to damage your system with just a simple command, especially if you use the "sudo" prefix to give the command the power of the system administrator.
As long as you only use the given examples you should be fine though.