[JoeDaDude]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp("/mycommand", cmdtext, true, 10) == 0)
    {
        // Do something here
        return 1;
    }
    return SendClientMessage(playerid,COLOR_WHITE,"This command does not exist, Please type /commands for a list");
}

Ingame would that say: This command does not exist, Please type /commands for a list
If someone types in a command that dont exist