pawn Код:
if(strcmp(cmd, "/help",true)==0)
    {
                   new string[64];
                   GetPlayerName(playerid, sendername, sizeof(sendername));
                   format(string,sizeof(string)," %s used /help");
        SendClientMessage(playerid, COLOR," you used /help");
               }
               for(new i = 0; i < MAX_PLAYERS; i++)
    {
            if(PlayerInfo[i][pAdmin] >= 1)
            {
                SendClientMessage(i, COLOR, string);
            }
    return 1;
    }
 
Change pAdmin to how your script detects if a players an admin
Mkae sure you have 
new sendername[MAX_PLAYER_NAME];
at the top of onplayercommandtext
This sends a message to all the admins online telling them that the player used /help..
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