Problem With Bash Scripting

What's up guys,

I am currently trying to figure out the answer to this question and I cannot for the life of me! The question is : "Explain how to do the following in UNIX/Linux shell script. You are not expected to remember the exact command syntax, but explain approximately how you would do the following - 1) Change oldstring to newstring in 1000 HTML files.

Any help would be much appreciated!

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