source: binary-improvements/AllocsCommands/Commands/ListKnownPlayers.cs@ 360

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

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 / steamid>\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 or matches the given SteamID";
                }

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

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

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

                        if (_params.Count == 1) {
                                long steamid;
                                if (_params [0].EqualsCaseInsensitive ("-online")) {
                                        onlineOnly = true;
                                } else if (_params [0].EqualsCaseInsensitive ("-notbanned")) {
                                        notBannedOnly = true;
                                } else if (_params [0].Length == 17 && long.TryParse (_params [0], out steamid)) {
                                        isSteamId = true;
                                } else {
                                        nameFilter = _params [0];
                                }
                        }

                        if (isSteamId) {
                                Player p = PersistentContainer.Instance.Players [_params [0], false];

                                if (p != null) {
                                        SdtdConsole.Instance.Output (string.Format (
                                                "{0}. {1}, id={2}, steamid={3}, online={4}, ip={5}, playtime={6} m, seen={7}",
                                                0, p.Name, p.EntityID, _params [0], p.IsOnline, p.IP,
                                                p.TotalPlayTime / 60,
                                                p.LastOnline.ToString ("yyyy-MM-dd HH:mm"))
                                        );
                                } else {
                                        SdtdConsole.Instance.Output (string.Format ("SteamID {0} unknown!", _params [0]));
                                }
                        } else {
                                int num = 0;
                                foreach (KeyValuePair<string, Player> kvp in PersistentContainer.Instance.Players.Dict) {
                                        Player p = kvp.Value;

                                        if (
                                                (!onlineOnly || p.IsOnline)
                                                && (!notBannedOnly || !admTools.IsBanned (kvp.Key))
                                                && (nameFilter.Length == 0 || p.Name.ContainsCaseInsensitive (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, kvp.Key, 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");
                        }
                }
        }
}