Arma 3 game dedicated server utility is used to start server, to automatically set -mod folders and -port, you can configure it in config file, all [varName] is replaced with contents of matching <varName></varName>, replacing is done in few iterations to propagate dependencies, has two inbuild variables: [port] is taken from the containing fold…

start_server.exe.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <!--
    this utility is used to start server, to automatically set -mod folders and -port
    this utility was designed to be right next to the <executable>  
    you can configure it in this config file, all [varName] is replaced with contents of matching <varName></varName>
    replacing is done in few iterations to propagate dependencies

    has two inbuild variables
    [port] is taken from the containing folder name port_theRestOfTheName
    [modFolders] is a ; seperated list of all top level folders starting with @ 
    
    Sometimes you want to prioritize some modsFolders, if so put them into <modFoldersPriority> seperated by new line.
    If modFolder is present it will be loaded before others. Top is highest priority.
  -->
  
  <profilesFolder>server_configs</profilesFolder>
  <profileName>server_profile</profileName>
  
  <serverConfigMain>[profilesFolder]\TAWServer.cfg</serverConfigMain>
  <serverConfigBasic>[profilesFolder]\TAWbasic.cfg</serverConfigBasic>

  <executable>arma3server.exe</executable>
  <arguments>
    -port=[port]
    -skipIntro
    -noSplash
    -world=empty
    "-config=[serverConfigMain]"
    "-cfg=[serverConfigBasic]"
    "-profiles=[profilesFolder]"
    "-name=[profileName]"
    -noSound
    -autoInit
    -loadMissionToMemory
    "-mod=[modFolders]"
  </arguments>

  <modFoldersPriority>
	@TAW_SERVER_CORE
	@TAW_DIV_CORE
	@TAW_SERVER_CONTENT
	@TAW_AM2_CONTENT
	@AllInArmaTerrainPack
	@TAW_AM2_MAPS
  </modFoldersPriority>
</configuration>

start_server.exe.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Threading;
using System.ComponentModel;
using System.Xml;
using System.Xml.Linq;
using System.Runtime.InteropServices;

namespace start_server
{
    class Program
    {
        static void Main(string[] args)
        {
            var p = new Program();
            p.Run();
        }
        public void Run() {
            
            /*
            example param line:
            arma3server.exe 
            -port=2382 
            -skipIntro 
            -noSplash 
            -world=empty 
            -config=insurgency_mandatory_modpack_Configs\TAWServer.cfg 
            -cfg=insurgency_mandatory_modpack_Configs\TAWbasic.cfg 
            -profiles=insurgency_mandatory_modpack_Configs 
            -name=server_profile 
            -noSound 
            -autoInit 
            -loadMissionToMemory 
            -mod=@TAW_SERVER_CORE;@TAW_SERVER_CONTENT;
            */

            var myExePath = Path.GetFullPath(Environment.GetCommandLineArgs()[0]);
            var myExeFileName = Path.GetFileName(myExePath);
            var myExeDir = Path.GetDirectoryName(myExePath);
            var myExeTopDirName = GetDeepestFolderInPath(myExeDir);

            var modFolders = Directory.GetDirectories(myExeDir, "@*", SearchOption.TopDirectoryOnly).Select(f => GetDeepestFolderInPath(f)).ToArray();

            int port = 0;
            if (myExeTopDirName.Contains('_')) port = int.Parse(myExeTopDirName.Substring(0, myExeTopDirName.IndexOf("_")));
            else throw new System.InvalidOperationException(myExeTopDirName + " folder name does not contain _ the dir name should be port_therest, where port is the server port");

  


            Dictionary<string, string> values = new Dictionary<string,string>();

            var xml = XDocument.Load(myExeFileName + ".config");
            var configuration = xml.Element("configuration");

            // load all values from xml config
            foreach (var e in configuration.Elements())
            {
                values[e.Name.LocalName] = e.Value;
            }


            var modFoldersPriority = values["modFoldersPriority"].Split('\n').Select(x=>x.Trim()).Reverse().ToList();
            values["modFolders"] = string.Join(";", modFolders.OrderByDescending(x=>modFoldersPriority.IndexOf(x)));
            values["port"] = port.ToString();

            


            // in all values, replace [varName] with its actual value
            for (int i = 0; i < 5; i++) // few iterations to propagate [varName]
            {
                var valuesCopy = new Dictionary<string, string>(values);
                foreach (var kvp_replaceInThis in valuesCopy.Keys)
                {
                    foreach (var kvp_replaceBy in valuesCopy)
                    {
                        values[kvp_replaceInThis] = values[kvp_replaceInThis].Replace("[" + kvp_replaceBy.Key + "]", kvp_replaceBy.Value);
                    }
                }
            }

            // check if values that mean file location exists
            foreach (var f in new[] { "serverConfigMain", "serverConfigBasic", "executable" })
            {
                var path = values[f];
                if (!File.Exists(path)) throw new Exception("the path from variable " + f + "=" + path + " doesn't exists");
            }

            // split the arguments line by new line and trim from both sides
            var arguments = values["arguments"].Split('\n').Select(x => x.Trim());
            var executable = values["executable"];            


            Console.WriteLine("Folder:");
            Console.WriteLine("\t" + myExeTopDirName);
            Console.WriteLine();
            Console.WriteLine("Executable:");
            Console.WriteLine("\t" + executable);
            Console.WriteLine();
            Console.WriteLine("Parameters:");
            Console.WriteLine("\t" + string.Join("\n\t", arguments));


            var startInfo = new ProcessStartInfo()
            {
                FileName = executable,
                Arguments = string.Join(" ", arguments),
                UseShellExecute = false,
            };

            var process = Process.Start(startInfo);
            if (process == null) throw new System.NullReferenceException("the started process is null");
            
            AppDomain.CurrentDomain.ProcessExit += (sender, a) =>
            {
                process.CloseMainWindow();
                process.Kill();
            };

            var handler = new ConsoleEventDelegate((int eventType) =>
            {
                if (eventType == 2)
                {
                    process.CloseMainWindow();
                    process.Kill();
                }
                return true;
            });
            SetConsoleCtrlHandler(handler, true);

            Console.WriteLine();
            Console.WriteLine("Waiting for server to die...");
            process.WaitForExit();
        }
        static string GetDeepestFolderInPath(string path)
        {
            return path.Split(new[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar }).Last();
        }



        // its pain in the ass to detect close in C#
        //http://stackoverflow.com/questions/4646827/on-exit-for-a-console-application
        private delegate bool ConsoleEventDelegate(int eventType);
        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool SetConsoleCtrlHandler(ConsoleEventDelegate callback, bool add);

    }
}