Let’s assume we have a user, Jane Doe, with the username of jdoe and the UID of 1001 who we need to move to another UID (for some reason or another).

First, change the UID of the user:

# usermod -u 3001 jdoe

Next, use search and change all file’s ownership owned by this user:

# find / -user 1001 -exec chown -h jdoe {} \;