[CalvinC]

Do you use y_commands, OnPlayerCommandText, zcmd or what?
For OnPlayerCommandText, you can add a SendClientMessage after all your commands, like:

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/mycommand", true))
    {
        SendClientMessage(playerid, -1, "This is a command.");
        return 1;
    }
    SendClientMessage(playerid, -1, "You have not entered a command.");
    return 1;
}

For zcmd, you can simply use OnPlayerCommandPerformed.

pawn Код:

public OnPlayerCommandPerformed(playerid, cmdtext[], success)
{
    if(!success) SendClientMessage(playerid, -1, "You have not entered a command.");
    return 1;
}