[Rob_Maate]

I'll assume your using zcmd and sscanf

pawn Code:

CMD:giveall(playerid, params[])
{
    new value;
    if(!IsPlayerAdmin(playerid)) return 1;
    if(sscanf(params, "d", value) != 0) SendClientMessage(playerid, 0xFFFFFFFF, "USAGE: /giveall [Amount]"); return 1;
    for(new i=0; i<MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            GivePlayerMoney(i, value);
        }
    }
    return 1;
}