Linux: Finding text within multiple files in multiple directories and replacing the text

I like to start these type of recursive runs in the root directory of the search. So in our test case I would do the following:

Eg. Find the port number 8080 in multiple .xml files and replace it with the port number 15001.

1. cd /path/rootdirectoryofsearch

*note – Change which files get examined by changing the extension type:

1. Then run the command
   With Backup .mybackup
   find . -type f -name “*.xml” -exec sed -i.mybackup -e ‘s/8080/15001/g’ {} +
2. Delete backups:
   find . -name “*.mybackup” -type f – delete
3. With Backup
   find . -type f -name “*.xml” -exec sed -i” ‘s/8080/15001/g’ {} +