How to I get back from shell named "cat" to default Terminal? This is from a failed RVM (Ruby) installation.

I tried to install RVM with an About.com guide. Now the terminal is labeled cat at the top after flashing login and bash. It won't run anything I type. I think it's because one of the steps told me to enter this:
$ cat >>~/.bash_profile
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"
The guide is here. Step 5 or 6 messed me up.
http://ruby.about.com/od/rubyversionmanager/ss/Installing-Ruby-On-Snow-Leopard-W ith-Rvm_5.htm

Try Ctl-C

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