Place anywhere, then edit the file to configure it. Then run it like so: ./factorio-server.sh [update|start|stop|restart]

factorio-server.sh

#!/bin/bash

# Config
working_dir="/opt/factorio-server"
factorio="bin/x64/factorio"
start_cmd="systemctl start factorio-server"
stop_cmd="systemctl stop factorio-server"
# End config

# Variables
url="https://www.factorio.com/get-download/latest/headless/linux64"
update_dir="update"
# End variables

cd $working_dir || exit
if [ ! -e $update_dir ]; then mkdir $update_dir; fi
if [ "$2" == "--force" ]; then update="force"; fi

ver="1.0"

printf "Factorio Updater %s by NotoriousPyro\n\n" "$ver"

FactorioStart ()
{
        echo "Starting the Factorio server..."
        $start_cmd
}

FactorioStop ()
{
        echo "Stopping the Factorio server..."
        $stop_cmd
}

FactorioRestart ()
{
        echo "Restarting the Factorio server..."
        FactorioStop && FactorioStart
}

FactorioUpdate ()
{
        version_current=$($factorio --version | grep "Version: " | awk '{print $2}')
        version_latest_url=$(curl -sI "$url" | grep "Location: " | awk '{print $2}')
        version_latest_filename=$(echo "$version_latest_url" | cut -d '/' -f 5 | cut -d '?' -f 1)
        version_latest=$(echo "$version_latest_filename" | sed s/factorio_headless_x64_//g | sed s/.tar.gz//g)
        update_file="$update_dir/$version_latest_filename"

        echo "Current version: $version_current"
        echo "Latest version: $version_latest [$version_latest_filename]"
        printf "\n"

        if [ "$update" == "force" ]; then version_current=""; fi
        if [ "$version_current" == "$version_latest" ]; then echo "No new version detected" & exit; fi

        echo "Installing $version_latest_filename"
        FactorioStop
        echo "Downloading $version_latest_url..."
        wget -qO "$update_file" "$url"
        $factorio --apply-update "$update_file"
        rm -f "$update_file"
        printf "\n"
        echo "Installed."
        FactorioStart
}

Usage ()
{
        echo "Usage:"
        echo "$0 [update|start|stop|restart]"
        exit
}

for i in "$1"
do
        case $i in
                update)         FactorioUpdate;;
                start)          FactorioStart;;
                stop)           FactorioStop;;
                restart)        FactorioRestart;;
                *)              Usage;;
        esac
done