source: binary-improvements/AllocsCommands/Commands/ListKnownPlayers.cs@ 369

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 / userid>\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 UserID";
                }

                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;
                        PlatformUserIdentifierAbs userIdFilter = null;

                        if (_params.Count == 1) {
                                if (_params [0].EqualsCaseInsensitive ("-online")) {
                                        onlineOnly = true;
                                } else if (_params [0].EqualsCaseInsensitive ("-notbanned")) {
                                        notBannedOnly = true;
                                } else if (PlatformUserIdentifierAbs.TryFromCombinedString (_params [0], out userIdFilter)) {
                                        // if true nothing to do, set by the out parameter
                                } else {
                                        nameFilter = _params [0];
                                }
                        }

                        if (userIdFilter != null) {
                                Player p = PersistentContainer.Instance.Players [userIdFilter, false];

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

                                        if (
                                                (!onlineOnly || p.IsOnline)
                                                && (!notBannedOnly || !admTools.IsBanned (kvp.Key, out _, out _))
                                                && (nameFilter.Length == 0 || p.Name.ContainsCaseInsensitive (nameFilter))
                                        ) {
                                                SdtdConsole.Instance.Output (
                                                        $"{++num}. {p.Name}, id={p.EntityID}, steamid={kvp.Key}, online={p.IsOnline}, ip={p.IP}, playtime={p.TotalPlayTime / 60} m, seen={p.LastOnline:yyyy-MM-dd HH:mm}"
                                                );
                                        }
                                }

                                SdtdConsole.Instance.Output ($"Total of {PersistentContainer.Instance.Players.Count} known");
                        }
                }
        }
}