Linux script to replace words in text needed

I can help you and make script in advance

Hey, I have quite a bit of experience with automation scripts using Bash/Shell scripting and Python. Ideally, for this project we will need some sort of Regular Expression analysis (regex). I just need some more information on what exactly you want to replace with a <unk> tag. Kind Regards, Fahd

I know how to do that. Contact me if you are interested.

I would like to create a generic shell script for the same requirement, with getopts function to accept arguments. I could love to share more details and look forward to complete the project.