/usr/share/xscreensaver/config/halo.xml is in xscreensaver-data-extra 5.15-2ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="halo" _label="Halo">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="200000" default="100000"
convert="invert"/>
<number id="count" type="slider" arg="-count %"
_label="Number of circles" _low-label="Few" _high-label="Many"
low="0" high="20" default="0"/>
<number id="ncolors" type="slider" arg="-colors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="100"/>
<select id="mode">
<option id="random" _label="Random mode"/>
<option id="seuss" _label="Seuss mode" arg-set="-mode seuss"/>
<option id="ramp" _label="Ramp mode" arg-set="-mode ramp"/>
</select>
<hgroup>
<boolean id="animate" _label="Animate circles" arg-set="-animate"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
<_description>
Draws trippy psychedelic circular patterns that hurt to look at.
http://en.wikipedia.org/wiki/Moire_pattern
Written by Jamie Zawinski; 1993.
</_description>
</screensaver>
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