[Steeve_Smith]

Код:

if(strcmp(cmdtext, "/open", true) == 0)
 { 
   MoveObject(gate, cordX, cordY, cordZ, speed); // Normally speed 1 is enough | For coords take the coords of your opened gate
   SendClientMessage(playerid, color, "Gate opened!");
 }

Код:

if(strcmp(cmdtext, "/close'", true) == 0)
 { 
   MoveObject(gate, cordX, cordY, cordZ, speed); // Normally speed 1 is enough | For coords take the coords of your closed gate
   SendClientMessage(playerid, color, "Gate closed!");
 }

Use "IsPlayerInRangeOfPoint" or you will be able to open/close it in whole San Andreas.