source: binary-improvements/AllocsCommands/Commands/ListKnownPlayers.cs@ 255

using AllocsFixes.PersistentData;
using System;
using System.Collections.Generic;

namespace AllocsFixes.CustomCommands
{
        public class ListKnownPlayers : ConsoleCmdAbstract
        {
                public override string GetDescription ()
                {
                        return "lists all players that were ever online";
                }

                public override string GetHelp () {
                        return "Usage:\n" +
                                   "  1. listknownplayers\n" +
                                   "  2. listknownplayers -online\n" +
                                   "  3. listknownplayers -notbanned\n" +
                                   "  4. listknownplayers <player name>\n" +
                                   "1. Lists all players that have ever been online\n" +
                                   "2. Lists only the players that are currently online\n" +
                                   "3. Lists only the players that are not banned\n" +
                                        "4. Lists all players whose name contains the given string";
                }

                public override string[] GetCommands ()
                {
                        return new string[] { "listknownplayers", "lkp" };
                }

                public override void Execute (List<string> _params, CommandSenderInfo _senderInfo)
                {
                        try {
                                AdminTools admTools = GameManager.Instance.adminTools;

                                bool onlineOnly = false;
                                bool notBannedOnly = false;
                                string nameFilter = string.Empty;

                                if (_params.Count == 1) {
                                        if (_params [0].ToLower ().Equals ("-online")) {
                                                onlineOnly = true;
                                        } else if (_params [0].ToLower ().Equals ("-notbanned")) {
                                                notBannedOnly = true;
                                        } else {
                                                nameFilter = _params [0].ToLower ();
                                        }
                                }

                                int num = 0;
                                foreach (string sid in PersistentContainer.Instance.Players.SteamIDs) {
                                        Player p = PersistentContainer.Instance.Players [sid, false];

                                        if (
                                                (!onlineOnly || p.IsOnline)
                                                && (!notBannedOnly || !admTools.IsBanned (sid))
                                                && (nameFilter.Length == 0 || p.Name.ToLower ().Contains (nameFilter))
                                        ) {
                                                SdtdConsole.Instance.Output (String.Format ("{0}. {1}, id={2}, steamid={3}, online={4}, ip={5}, playtime={6} m, seen={7}",
                                                                                    ++num, p.Name, p.EntityID, sid, p.IsOnline, p.IP,
                                                                                    p.TotalPlayTime / 60,
                                                                                    p.LastOnline.ToString ("yyyy-MM-dd HH:mm"))
                                                );
                                        }
                                }
                                SdtdConsole.Instance.Output ("Total of " + PersistentContainer.Instance.Players.Count + " known");
                        } catch (Exception e) {
                                Log.Out ("Error in ListKnownPlayers.Run: " + e);
                        }
                }
        }
}