[nepstep]

Try this one (Put it inside OnPlayerCommandText):
[Is a simple kill command, you can add more functions to make it as you want to be.]

pawn Код:

new
        index,
        cmd[20];
    cmd = strtok(cmdtext, index);
    if (strcmp(cmd, "/kill", true) == 0)
    {
        new
            tmp[20],
            id;
        tmp = strtok(cmdtext, index);
        if (strlen(tmp))
        {
            id = strval(tmp);
            if (IsPlayerConnected(id))
            {
                SetPlayerHealth(id, 0);
                SendClientMessage(playerid, 0x00FF00AA, "Player killed");
            }
            else
            {
                SendClientMessage(playerid, 0xFF0000AA, "Player not found");
            }
        }
        else
        {
            SendClientMessage(playerid, 0xFF0000AA, "Usage: \"/kill <playerid>\"");
        }
        return 1;
    }