minecraft-server

#!/bin/bash

LOCKFILE=/tmp/minecraft_server.lock

if ! ln -s $$ "$LOCKFILE" 2>/dev/null; then
	former_pid=$(readlink "$LOCKFILE")
	if [ -e "/proc/$former_pid" ]; then
		exit
	fi
fi

cd ~/.minecraft_server/
jar_file=$(ls -tr minecraft_server.*.jar | tail -1)

/usr/bin/screen -S minecraft_server -d -m java -server -Xmx1024M -Xms1024M -jar "${jar_file}" nogui

PID=$(screen -ls minecraft_server | grep -Po '[0-9]+(?=\.minecraft_server)')
ln -sf $PID "$LOCKFILE" 2>/dev/null