Changing all attributes names at once

Hello,

I am doing a market basket analysis exercise and I loaded the data using the "items in separate columns" option in the FP-Growth operator. All is working fine, but the names of the attributes are all att1, att2, etc. I have 50 attributes, and I have their names stored in a separate file. How can I change their names automatically, without having to enter them one-by-one using the Rename operator?

Regards,
Bernardo