mc-server-start.sh

#!/bin/sh
mem_min=1
mem_max=$((($(free -m | awk '/^Mem:/{print $2}')-128)/1024))

mem=$(printf "%d" "$1")
if [ "$mem" -lt "$mem_min" ]
then mem=$mem_min
elif [ "$mem" -gt "$mem_max" ]
then mem=$mem_max
fi

cmd="java -Xmx${mem}G -Xms${mem}G -jar server.jar nogui"
echo "> $cmd"
eval "$cmd"