sed - How to find and replace all occurrences of a string recursively in a directory tree?

Question

Using just grep and sed, how do I replace all occurrences of:

a.example.com

with

b.example.com

within a text file under the /home/user/ directory tree recursively finding and replacing all occurrences in all files in sub-directories as well.

Answer 1

Try this:

find /home/user/ -type f | xargs sed -i  's/a.example.com/b.example.com/g'

In case you want to ignore dot directories

find . ( ! -regex '.*/..*' ) -type f | xargs sed -i 's/a.example.com/b.example.com/g'

Edit: escaped dots in search expression