Can't type in Terminal

Ok. Here's the full problem. Do you have any suggestions?

When I tried to do a sudo command, Terminal asked for my password. I was confused about it not showing what I was typing. (Now, I know now that it was typing my password, just with an invisibility cloak.) I'm not sure what exactly i did but i got frustrated and closed the window. Since I restarted terminal (and my computer) i haven't been able to type in it at all.

I was able to run a simple command in Terminal from textwrangler, but it logs out when it finished running it. This is what it showed:

Last login: Sat May 18 18:46:41 on ttys000
/var/folders/Il/IlsW9YeOHXqHfX6wKgej8++++TI/-Tmp-/Cleanup\ At\ Startup/firstprog-390661984.204.py.command ; exit;
Users-MacBook-Pro:~ User$ /var/folders/Il/IlsW9YeOHXqHfX6wKgej8++++TI/-Tmp-/Cleanup\ At\ Startup/firstprog-390661984.204.py.command ; exit;
Hello World
logout

[Process completed]

I've checked some webforums and nothing has worked so far. In the com.apple.Terminal.plist file in Library/Preferences:
<key>CommandString</key>
<string></string>

There's also a <key>shellExitAction</key> command that I thought about deleting, but I was worried that would make things worse.

Any ideas or suggestions?

That's normal behaviour given what command was executed. As you can see, at the very end is an "exit" which exited the bash shell in Terminal.

If you want to execute commands, open up a separate Terminal window.