minecraft script

#! /bin/sh
WORLD=/opt/minecraft/world/
WORLD_HDD=/opt/minecraft/world_hdd/
RD_SIZE=1024M
USER=minecraft
RAM=4G
BUKKIT=/opt/minecraft/craftbukkit.jar
case "$1" in
                start)
                echo "Checking tmux session"
                if su $USER -c 'tmux ls | grep $USER' > /dev/null; then
                        echo "tmux session detected killing server"
                        su $USER -c 'tmux kill-session -t $USER'
                fi
                echo "Creating new session"
                su $USER -c 'tmux new-session -d -n bukkit -s $USER'
                su $USER -c 'tmux new-window -d -t $USER -n lsyncd'
                echo "Setting up RAMdisk"
                echo "   -Checking world folder"
                if [ "$(ls -A $WORLD)" ]; then
                        echo "   -World folder not empty"
                        echo "      -Resyncing backup world"
                        su $USER -c "rsync -a $WORLD $WORLD_HDD"
                        echo "      -Unmounting RAMdisk"
                        umount $WORLD
                        echo "      -Cleaning out world folder"
                        rm -rf $WORLD
                        echo "      -Remakeing world folder"
                        su $USER -c "mkdir $WORLD"
                else
                        echo "   -World folder empty, checking permissions"
                        chown $USER:$USER $WORLD
                fi
                echo "   -Mounting RAMdisk"
                mount -t tmpfs -o size=$SIZE tmpfs $WORLD
                echo "   -Rsyncing world to RAMdisk"
                su $USER -c "rsync -a $WORLD_HDD $WORLD"
                echo "   -Fireing up lsyncd to live backup world"
                su $USER -c "tmux -q send -t $USER:lsyncd lsyncd Space -nodaemon Space -rsync Space $WORLD Space $WORLD_HDD Space C-m"
                echo "Starting Server"
                su $USER -c "tmux -q send -t $USER:bukkit java Space -Xmx $RAM Space -Xms $RAM Space -jar Space $BUKKIT Space C-m"
                echo "   -Waiting for startup"
                wait 30
                echo "   -Checking Server Status"
                $0 status
                ;;
        stop)
                echo "Shutting down server"
                su $USER -c "tmux -q send -t $USER:bukkit say Space Server Space is Space going Space offline. C-m"
                echo "   -Disabling saving"
                su $USER -c "tmux -q send -t $USER:bukkit save-off C-m"
                echo "   -Saving world"
                su $USER -c "tmux -q send -t $USER:bukkit save-all C-m"
                echo "   -Stopping server"
                su $USER -c "tmux -q send -t $USER:bukkit stop C-m"
                echo "Stoping lsyncd"
                su $USER -c "tmux -q send -t $USER:lsyncd C-c"
                echo "Syncing backup"
                su $USER -c "rsync -a $WORLD $WORLD_HDD"
        echo "Clearing out tmux sessions"
        su $USER -c "tmux kill-session - $USER"
                ;;
        restart)
                $0 stop
                $0 start
                ;;
        reload)
                echo -n "Reloading Bukkit "
                su $USER -c "tmux -q send -t $USER:bukkit reload C-m"
                ;;
        status)
                echo -n "Checking Server Status"
                if [ "ps ax | grep -v grep | grep -v tmux | grep $BUKKIT" > /dev/null ]; then
                        PID=`ps ax | grep -v grep | grep -v sh | grep -v -i 'tmux' | grep "$BUKKIT"`
                        top -n 1 -p ${PID:0:5} | grep ${PID:0:5}
        fi
        ;;
    *)
        ## If no parameters are given, print which are avaiable.
        echo "Usage: $0 {start|stop|status|restart|reload|update}"
        exit 1
        ;;
esac