[Calgon]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
if(strcmp(cmdtext, "/help", true) == 0)
{
     SendClientMessage(playerid, COLOR_BLUE, "** HELP **");
     SendClientMessage(playerid, COLOR_RED, "** COMMANDS **\n /suicide");
     return 1;
}
if(strcmp(cmdtext, "/error", true) == 0)
{
    SendClientMessage(playerid, COLOR_RED, "** ERROR **");
    return 1;
}
}

Remember to return 1 (for commands) - though you should use an alternate command processor (such as zcmd), and use brackets to keep code in callbacks/functions etc.