This file is indexed.

/usr/lib/xtrkcad/demos/dmruler.xtr is in xtrkcad 1:4.0.2-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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VERSION 2
DEMOINIT
ORIG 5.000 5.000 0.000
STRAIGHT 1 DEMO 1
	E 5.916667 3.166667 270.000000
	E 29.166667 3.166667 90.000000
	END
STRAIGHT 2 DEMO 1
	E 6.000000 6.916667 270.000000
	E 29.166667 6.916667 90.000000
	END
REDRAW
RESET
MESSAGE
The <Ruler> command draws a Ruler on the layout you can use to measure distances.

END
STEP
COMMAND Ruler
MOUSE 2 29.000 6.917
MOUSE 3 29.083 3.167
BIGPAUSE
MOUSE 4 29.083 3.167
MESSAGE
_________________________________________

If you press the <Ruler> command again the Ruler is removed.
END
BIGPAUSE
COMMAND Ruler
BIGPAUSE
MESSAGE
_________________________________________

But you can place it somewhere else.
END
BIGPAUSE
MOUSE 2 6.000 5.583
MOUSE 3 29.250 5.750
BIGPAUSE
MOUSE 4 29.250 5.750
MESSAGE
=========================================
END
STEP
CLEAR