A small CentOS VM post-cloning script to change hostname and regenerate SSH keys

centSetup.sh

#!/bin/bash
if [[ $# -ne 1 ]]; then
    echo "Usage: $0 <hostname>"
    exit 1
fi
printf "Starting setup with hostname \033[1;32m$1\033[0m: continue [y/N]? "
while true; do
    read -sn1 response
    case "$response" in
        [yY]) printf '\033[1;32my\033[0m\n'; break;;
        [nN]|"") printf '\033[1;31mn\033[0m\n'; exit 0;;
    esac
done
echo Regenerating SSHd keys…
rm /etc/ssh/ssh_host_* 2> /dev/null
echo Changing hostname…
sed -Ei "s/(\s{2,})(\S{1,}\s)?(localhost\s)/\1$1 \3/g" /etc/hosts
hostnamectl set-hostname $1
echo Restarting services…
systemctl restart network sshd
echo Deleting myself…
rm -- "$0"