Paper Server Manager [Auto-updating, auto-restarting] (BASH)

#!/bin/bash
# ---  CONFIG  ---

Version=1.16.4
AutoUpdate=TRUE
ListVersions=FALSE
AutoRestart=TRUE
MaxRam=4096M
MinRam=4096M
JavaExe="java"
StartDir="/home/user/minecraft-server/"
ExtraArgs="nogui"

# NOTE: If you do not have cURL installed, set AutoUpdate to true.
#       You can check if you have it installed by opening terminal
#       and typing curl and pressing enter.



# ---  DO NOT EDIT BELOW UNLESS YOU KNOW WHAT YOU ARE DOING!  ---

function FINDFILE {
  FILE=`ls | grep -i "^paper.*jar$"`
}

pushd $StartDir >/dev/null

PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
echo -e '\033]2;'Paper Server Manager'\007'
if [[ `echo "$ListVersions" | awk '{print tolower($0)}'` == "true" ]]; then
  Versions=`curl -s https://papermc.io/api/v1/paper`
  echo -e "[BASH] Supported Versions: ${Versions:31:-2}\n[BASH] Press any key to exit."
  read -n 1 -s
  exit 0
fi

if [[ `echo "$AutoUpdate" | awk '{print tolower($0)}'` == "true" ]]; then
  echo "[BASH] Checking for updates..."
  BUILD=`curl -s https://papermc.io/api/v2/projects/paper/versions/$Version | cut -d ']' -f '1' | rev | cut -d ',' -f '1' | rev`
  if [ -f "Paper-$Version-$BUILD.jar" ]; then
    echo "[BASH] Paper up to date!"
    FILE=Paper-$Version-$BUILD.jar
  else
    FINDFILE
    if [[ $FILE != "" ]]; then rm $FILE; fi
    echo "[BASH] Downloading update."
    curl https://papermc.io/api/v2/projects/paper/versions/$Version/builds/$BUILD/downloads/paper-$Version-$BUILD.jar -o Paper-$Version-$BUILD.jar
    FILE=Paper-$Version-$BUILD.jar
  fi
else
  FINDFILE
fi

while true; do
  echo -e "[BASH] Starting server...\n"
  "$JavaExe" -Xmx$MaxRam -Xms$MinRam -jar $FILE $ExtraArgs
  if [[ `echo "$AutoRestart" | awk '{print tolower($0)}'` == "true" ]]; then
    echo "[BASH] CTRL+C to exit (Auto-restarting in 5 seconds)."
    sleep 5
  else
    break
  fi
done

popd >/dev/null