Linux: remove file extensions for multiple files

Question

I have many files with .txt extension. How to remove .txt extension for multiple files in linux?

I found that

rename .old .new *.old

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Answer 1

You can explicitly pass in an empty string as an argument.

rename .old '' *.old

And with subfolders, find . -type d -exec rename .old '' {}/*.old \;. {} is the substitute for the entry found with find, and \; terminates the arglist for the command given after -exec.