command change user linux code example

Example 1: linux change username

# login as root and make sure that there are no active processes for user
usermod -l NEW_USERNAME OLD_USERNAME
# if user is running kill user w the following command
userUID=$(id -u OLD_USERNAME) && pkill -U $userUID

Example 2: change user linuxcommand ch

chown USER:GROUP FILE

Change the user and grop for an entire folder:
chown -R USER:GROUP FILE