Update hostname

update-hostname.sh

#!/bin/bash
# Update hostname
# by David Lonjon (@davidlonjon)
#
# The script update a machine hostname. 
# reboot is required after running this script
#
# LICENSE: GPLv2+
#
# INSTALLATION:
# Copy this script anywhere
#
# USAGE:
# ./update-hostname.sh
#
# EXAMPLES:
# N/A
# 
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

if [ -z "$1" ];
   then echo "Hostname is required" 1>&2
   exit 1
fi

HOSTNAME=$1

# Set the host name
hostname $HOSTNAME
HOSTNAME=${HOSTNAME//./-}
HOSTNAME=${HOSTNAME//_/-}
echo $HOSTNAME > /etc/hostname

sed -i "2i127.0.1.1 $HOSTNAME" /etc/hosts