[Nero_3D]

You could check with strcmp if the name matches

pawn Код:

CMD:adwaok(playerid, params[]) {
    new
        name[MAX_PLAYER_NAME]
    ;
    GetPlayerName(playerid, name, sizeof name);
    if(strcmp(name, "abcdef ", false) == 0) {
        return true;
    }
    return false;
}

But this is only secure if the players need to login after connection otherwise everyone just could take his name and use the command