update scripts and add setups linux-vm and macos

scripts/linux-change_hostname.sh

@@ -1,9 +1,6 @@
 #!/bin/bash
 
-if [ "$EUID" -ne 0 ]; then
-    echo "Please run this script as root using sudo."
-    exit 1
-fi
+set -e
 
 if [ -z "$1" ]; then
     echo "Usage: $0 <new-hostname>"
@@ -13,8 +10,12 @@ fi
 NEW_HOSTNAME=$1
 OLD_HOSTNAME=$(hostname)
 
-hostnamectl set-hostname "$NEW_HOSTNAME"
+echo ""
+echo "Changing hostname to '$NEW_HOSTNAME'..."
 
-sed -i "s/$OLD_HOSTNAME/$NEW_HOSTNAME/g" /etc/hosts
+sudo hostnamectl set-hostname "$NEW_HOSTNAME"
 
+sudo sed -i "s/$OLD_HOSTNAME/$NEW_HOSTNAME/g" /etc/hosts
+
+echo ""
 echo "Hostname has been changed to: $(hostname)"