make install.sh more pretty

install.sh

@@ -154,7 +154,14 @@ set_service(){
   cwd=$(pwd)
   user=$(whoami)
   exec_start="${python} ${cwd}/src/rpi-cpu2mqtt.py --service"
-  
+  if [ -f /etc/systemd/system/rpi-mqtt-monitor.service ]; then
+    read -p "Service file already exists. Do you want to remove it? (y/n) " yn
+    case $yn in
+        [Yy]* ) sudo rm /etc/systemd/system/rpi-mqtt-monitor.service; break;;
+        [Nn]* ) return;;
+        * ) echo "Please answer y for yes or n for no.";;
+    esac
+  fi
   print_green "+ Copy rpi-mqtt-monitor.service to /etc/systemd/system/"
   sudo cp ${cwd}/rpi-mqtt-monitor.service /etc/systemd/system/
   sudo sed -i "s|WorkingDirectory=.*|WorkingDirectory=${cwd}|" /etc/systemd/system/rpi-mqtt-monitor.service