All server commands (that you type like: /clearbricks) are prefixed with ServerCmd. So if you want a command to be called /beQuake then the code will look like:
function serverCmdBeQuake(%client)
{
   //define the player object
   %player = %client.player;
   
   //check if the player exists
   if(isObject(%player))
   {
      //change the player to the quake player
      %player.changeDatablock(PlayerQuakeArmor);
      
      //message the client
      messageClient(%client,'',"\c6You are now the Quake player!");
   }
}
Now when you type /beQuake it will attempt to turn you into the quake player.