[Scenario]

This is definitely the bad way to make this command. It's a lot easier doing it with sscanf.

pawn Code:

command(skin, playerid, params[])
{
        new string[128], skinid;
    if(IsPlayerAdmin(playerid))
    {
        if(sscanf(params, "d", skinid)
        {
            SendClientMessage(playerid, COLOR_WHITE, "SYNTAX: /skin [skinID]");
        }
        else
        {
            SetPlayerSkin(playerid, skinid);
            format(string, sizeof(string), "You have set your skin ID to %d", skinid);
            SendClientMessage(playerid, COLOR_WHITE, string);
        }
    }
    return 1;
}

This checks if a player is an admin (RCON), if the sscanf params are correct, if not it sends a message with the correct usage (SYNTAX) if the params are correct, it continues the command. It will set your skin to the ID you chose and then send you a message telling you what skin you chose. I used ZCMD and SSCANF2 to do this. Took me 10 seconds.