Bash script to start Minecraft server and keep it running if it crashes

start_server.command

#!/bin/bash

# Config
WINDOW_TITLE="Minecraft Server"
ONLINE_AUTH=true
RAM_INITIAL=512M
RAM_MAX=4G
RESTART_DELAY=10

################################################################################
cd "$(dirname "$0")"
while true
do
    # Find jar file
    jarfile=$(ls | grep -i -e "\.jar$" | head -1)
    
    if [ -e $jarfile ]; then
        echo " STARTING SERVER..."
        echo "==============================================================================="
        echo -n -e "\033]0;[RUNNING] $WINDOW_TITLE\007"
        java -Xms$RAM_INITIAL -Xmx$RAM_MAX -jar "$jarfile" -o $ONLINE_AUTH nogui > /dev/null
        echo -n -e "\033]0;[STOPPED!] $WINDOW_TITLE\007"
        echo "###############################################################################"
        echo " [$(date)] SERVER STOPPED!"
    else
        echo "Could not find the server jar file."
    fi

    echo " Rebooting in $RESTART_DELAY seconds... (Press CTRL-C to kill process)"
    sleep $RESTART_DELAY
done