Terminal use and what it does, can I sort?

I just opened terminal for the first time and was adding this command
sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart
then I managed to duplicate the sentence and a warning came next with options to put in my password or a Ctr abort. command, neither of which I managed to do as the page froze, I then proceeded to close it, again I got a warning asking me did I want to do this. I did as I did not give it my password I thought it would just revert back to how it was, but when I open terminal now the text that was at the top of the page is no longer there, it was something about log in.
i am now worried I have done something really bad, can anybody help me please?

You need to reboot to get your shell back.
It doesn't sound like you did any lasting damage, but you easily could have. Keep out of the shell unless you know what you're doing. Running "sudo" commands is not the right way to learn.
The Cisco VPN client is garbage. Uninstall it and use the built-in Cisco client instead.

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