bash - How to remove part of filename and add extension programmatically? -

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I have hundreds of files in such a folder like: 

  index.html? Tab = this is - File name

I would like to remove the "index.html? Tab =" part and add the extension ".txt" to all the files. How can I use this Unix Command Line Tools (I am using MacOSX 10.6.2)?

In Bash, 

  i for index.html \ tab = =; MV "$ i" "$ {i: 15} .txt"; Done

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