Export Coordinate Value for Each Anchor in a Line

This is just a quick example and could be way more robust but at least it gets you headed in the right direction.

var doc = app.activeDocument;
var sel = doc.selection;

// create a string to hold the anchor info
var str = "";

// iterate over each item in the selection
var item, point;
for (var i = 0; i < sel.length; i++) {
  item = sel[i];
  // only work with PathItems
  if (item.typename == "PathItem") {
    // append each point anchor info to the string
    for (var n = 0; n < item.pathPoints.length; n++) {
      point = item.pathPoints[n];
      str += "Point " + n + ": " + point.anchor + "\n";
    }
  }
}

if (str.length > 0) {
  // setup file info
  var fpath = Folder.desktop;
  var fname = "points.txt";
  var f = new File(fpath + "/" + fname);

  // write the points info to a text file
  try {
    f.encoding = "UTF-8";
    f.open("w");
    f.write(str);
    f.close();
  } catch (e) {
    alert("Error writing file!\n" + e);
  }
  alert("File saved!\n" + f);
  // open the file
  f.execute();
}