Rename file under sub-directory in bash

Question

I would like to know how to change the name of a txt file inside a directory.

I know that I can mv test123 test456, but that only changes the name in the current directory. What if I want to change the name of a txt file inside /home/folder1/?

Answer 1

Run the following:

mv /home/folder1/test123 /home/folder1/test456