[Seven_of_Nine]

corrected:

pawn Код:

new twice = 0; // Creates a variable with the value 0.
     if(cmdtext == "/rules") { //checks we typed /rules
          if(twice == 0) { //if our variable (twice) is still 0, then it adds one (so twice is 1 now.)
          twice++;
          } else { //Now, we've got the twice 1, and typed /rules, so it returns that message:
          twice = 0; //sets twice 0 to repeat the code.
          return SendClientMessage(playerid,red,"You've typed /rules twice!");//sends this message, and it doesnt perform /rules.
     }
}