/usr/share/dx/samples/scripts/Select is in dxsamples 4.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46  |     // Import the data
electrondensity = Import("watermolecule");
    // Construct a camera
camera = AutoCamera(electrondensity,width=3);
    // Reduce the data by a factor of two and by a factor of 3
reduced = Reduce(electrondensity,{2 3});
    // Select the first field from the group (reduced by a factor of 2)
selected = Select(reduced,0);
    // Create an isosurface and display
isosurface = Isosurface(selected,0.2);
Display(isosurface,camera);
    // Select the second field from the group (reduced by a factor of 3)
selected = Select(reduced,1);
     // Create an isosurface and display
isosurface = Isosurface(selected,0.2);
Display(isosurface,camera);
     //In this second example, individual 
     //positions are selected in turn from a field. These
     //positions are marked with a text glyph indicating their indices.
field = Import("CO2.general", format="general");
frame17 = Select(field,17);
positions = Extract(frame17,"positions");
glyphs = AutoGlyph(frame17);
glyphs = AutoColor(glyphs);
macro dosequence(frame)
{
  currentposition = Select(positions,frame);
  marker = Construct(currentposition, data = frame);
  textglyph = Glyph(marker,"text", scale=2);
  camera = AutoCamera(field);
  collected = Collect(textglyph, glyphs);
  Display(collected,camera, throttle=1);
}
dosequence(0);
dosequence(1);
dosequence(2);
dosequence(3);
dosequence(4);
dosequence(5);
dosequence(6);
dosequence(7);
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