restart.sh

#!/bin/bash
# Author: James A. Chambers - https://jamesachambers.com/
# More information at https://jamesachambers.com/raspberry-pi-minecraft-server-script-with-startup-service/
# GitHub Repository: https://github.com/TheRemote/RaspberryPiMinecraft
# Minecraft Server restart script - primarily called by minecraft service but can be ran manually with ./restart.sh

# Set path variable
USERPATH="pathvariable"
PathLength=${#USERPATH}
if [[ "$PathLength" -gt 12 ]]; then
    PATH="$USERPATH"
else
    echo "Unable to set path variable.  You likely need to download an updated version of SetupMinecraft.sh from GitHub!"
fi

# Check to make sure we aren't running as root
if [[ $(id -u) = 0 ]]; then
   echo "This script is not meant to run as root or sudo.  Please run as a normal user with ./restart.sh.  Exiting..."
   exit 1
fi

# Check if server is running
if ! screen -list | grep -q "\.minecraft"; then
    echo "Server is not currently running!"
    exit 1
fi

echo "Sending restart notifications to server..."

# Minecraft Server restart and pi reboot.
screen -Rd minecraft -X stuff "say Server is restarting in 30 seconds! $(printf '\r')"
sleep 23s
screen -Rd minecraft -X stuff "say Server is restarting in 7 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 6 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 5 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 4 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 3 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 2 seconds! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Server is restarting in 1 second! $(printf '\r')"
sleep 1s
screen -Rd minecraft -X stuff "say Closing server...$(printf '\r')"
screen -Rd minecraft -X stuff "stop $(printf '\r')"

# Wait up to 30 seconds for server to close
echo "Closing server..."
StopChecks=0
while [ $StopChecks -lt 30 ]; do
  if ! screen -list | grep -q "\.minecraft"; then
    break
  fi
  sleep 1;
  StopChecks=$((StopChecks+1))
done

echo "Restarting now."
sudo -n reboot