[CharlieBrown]

Use ZCMD

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{ 
     return 1;
}

e no fim do gamemode

pawn Код:

CMD:comando(playerid, params[])
{
SetPlayerHealth(playerid, 0.0);
SendClientMessage(playerid, COLOR_GRIS, "ESTO ES UNA PRUEBA");
return 1;
}

й melhor
OBS: Baixa essa include https://sampforum.blast.hk/showthread.php?tid=91354
e no topo do gamemode
#include zcmd