/usr/lib/pd/extra/iemguts/canvasdollarzero-help.pd is in pd-iemguts 0.2-1.
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 | #N canvas 251 447 635 427 10;
#X obj 99 229 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X obj 81 25 canvasdollarzero;
#X text 207 25 get \$0 of the (parent) canvas;
#X msg 88 128 bang;
#X obj 88 148 canvasdollarzero;
#X symbolatom 88 168 10 0 0 0 - - -;
#X text 57 85 this object is a shameless clone of iemlib's [parentdollarzero]
with an added feature.;
#X text 53 194 the feature is \, that you can query the \$0 of _any_
parent canvas;
#N canvas 0 0 781 383 canvasdollarzero 0;
#X obj 147 72 inlet;
#X text 298 167 "1" indicates to read the parent patch's (depth:1)
\$0;
#X msg 147 126 bang;
#X symbolatom 182 188 10 0 0 0 - - -;
#X obj 147 213 outlet;
#X obj 147 166 canvasdollarzero 1;
#X text 125 275 ok \, this example is not very splendid \, as \$0 is
the same for a patch and all it's subpatches anyhow \; nevertheless
\, believe me that it also works with abstractions;
#X connect 0 0 2 0;
#X connect 2 0 5 0;
#X connect 5 0 3 0;
#X connect 5 0 4 0;
#X restore 99 248 pd canvasdollarzero 1;
#X text 58 308 (c) 2008 IOhannes m zmoelnig \, Thomas Musil;
#X connect 0 0 8 0;
#X connect 3 0 4 0;
#X connect 4 0 5 0;
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