minecraft (spigotmc) server start script (run inside gnu screen)

start_minecraft_server.sh

#!/bin/bash

# edit username
username='username' #because i autostart in init.d, i dont want to execute as root

cd ~/minecraft/server || exit 1

case $1 in
"1.10")
  server="spigot-1.10.jar";;
"1.10.2")
  server="spigot-1.10.2.jar";;
"1.11")
  server="spigot-1.11.jar";;
"1.11.2")
  server="spigot-1.11.2.jar";;
*)
  # edit these with each new release
  server="spigot-1.11.2.jar";;
esac;

if ! screen -ls | grep -q "server";
then
  echo "starting ${server}..."

  sudo -u "$username" screen -d -m -S server \
   java \
   -d64 \
   -server \
   -XX:+UseConcMarkSweepGC \
   -XX:+UnlockExperimentalVMOptions \
   -XX:ParallelGCThreads=3 \
   -XX:+UseStringDeduplication \
   -XX:+UseThreadPriorities \
   -Djava.net.preferIPv4Stack=true \
   -XX:+OptimizeStringConcat \
   -Xrs \
   -XX:+AggressiveOpts \
   -Xmx3584M -Xms512M \
   -XX:+UseFastAccessorMethods \
   -XX:+UseConcMarkSweepGC \
   -jar "${server}" nogui

   #### old params that no longer work ####
   #-XX:+UseG1GC \
   #-XX:MaxPermSize=512m \ #removed in JVM 8.0
   #‑XX:+ExplicitGCInvokesConcurrent \ #fails to run
   #‑XX:+CMSConcurrentMTEnabled \ #fails to run
   #‑XX:ConcGCThreads=2 \ #fails to run
   #‑XX:+UseParNewGC \ #fails to run
   
   #### run console commands ####
   cr=$(printf \\r)
   #sleep 45
   #screen -S server -p 0 -X stuff "citizens reload ${cr}"   
else
   echo 'already running...'
fi