Terminal not recognising commands I have tried to add TextWrangler to the path environment modifying the file .bash_profile. This is what I have added:

# Just a comment 
PATH=/Applications/TextWrangler.app/Contents/MacOS
export PATH


I am not sure if it was exactly like this, but I am sure it was not so different. I must admit I do not know exactly what I was doing with the commands above, but by suggestions of other people and content on the web, I decided to add it to the .bash_profile file.

Now, when I type for example ls or open or nano it does not work. I have seen on the web that this has already happened to other people. 

I am not able to open the .bash_profile file with TextWrangler to restore it as it was, so this is a big problem, I might say.
Perhaps you can modify the .bash_profile with textedit or textmate? You can download textmate from http://www.macromates.com/download. I like it a lot better than TextWrangler.