Bash scripting/Change hostname

 

#!/usr/bin/env bash

##Truncete machine-id

#truncate -s 0 /etc/machine-id

OLD_HOSTNAME="$( hostname )"
NEW_HOSTNAME="$1"
DOMAIN="zzdats.lv"

if [ -z "$NEW_HOSTNAME" ]; then
 echo -n "Please enter new hostname: "
 read NEW_HOSTNAME < /dev/tty
fi

if [ -z "$NEW_HOSTNAME" ]; then
 echo "Error: no hostname entered. Exiting."
 exit 1
fi

echo "Changing hostname from $OLD_HOSTNAME to $NEW_HOSTNAME..."

hostname "$NEW_HOSTNAME"

hostnamectl set-hostname "$NEW_HOSTNAME"

sed -i "s/127.0.1.1*.*/127.0.1.1 $NEW_HOSTNAME.$DOMAIN $NEW_HOSTNAME/g" /etc/hosts

echo "Done."