how to change hostname in linux code example

Example 1: how to get hostname on linux

$ hostnamectl

Example 2: centos change hostname

# hostnamectl set-hostname your-new-hostname

Example 3: 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 4: linux change hostname

sudo nano /etc/hostname
sudo nano /etc/hosts
sudo reboot

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