mac terminal user privileges

i just started to use mac terminal, sorry for newbie question.

basically, while logged in as an admin I reset the user privileges in the terminal with export ("\U \$") or something similar, I don't remember correctly. Anyhow, I could cd back to the original user, but each time i restarted the terminal I got the message:

## cd /Users/Berzins ## No home directory: /Users/Berzins You have new mail. Linards:/ Berzins$

so as I understand I was in root, ok.

After I restarted iMac i am back in Linards:~ Berzins$ , BUT (HUUUUGE But) I don't have any of my original software, settings, preferences, its back to factory settings. Is there a way to login back to my original user?

Many thanks

Linards