var array=[
      [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
      [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
      [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
      [0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0],
      [0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0],
      [0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  ];

  var trucols=[];
  for(var i =0;i<array[0].length;i++){
        var truecount=0;
      for(var x=1;x<array.length;x++){
              
                if(array[0][i]==array[x][i])truecount++;
      }
     
      if(truecount==array.length-1)trucols.push(i);
  }
  console.log(trucols)