how to find and replace a word in the entire folder using single command?

If you wish to find and replace the occurrence of a word, phrase, URL, or anything, and it's in several documents, don't think that it's a tedious task.

For eg: if you wish to replace the word "Hello"  everywhere with "Hi", inside the directory "home/ucartztest/public_html/folder".

Run the following command:

 find /home/ucartztest/public_html/folder -type f -exec sed -i 's/Hello/Hi/g' {}  \;
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