/usr/lib/pd/extra/iemlib/parentdollarzero-help.pd is in pd-iemlib 1.20.1-1.
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 | #N canvas 88 175 632 308 10;
#X obj 35 111 test-parentdollarzero;
#X obj 299 107 f \$0;
#X obj 299 88 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X floatatom 299 129 5 0 0 0 - - -;
#X symbolatom 35 132 10 0 0 0 - - -;
#X obj 35 91 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 460 113 parent$0;
#X text 436 96 use this in an abstraction;
#X text 55 94 open this abstraction;
#X text 15 10 parentdollarzero;
#X text 156 12 receives the parent \$0 symbol;
#X text 14 28 (abbr. parent$0);
#X text 23 148 output: <symbol> of unique number;
#X text 241 148 output: <float> of unique number;
#X text 115 228 IEM KUG;
#X text 99 216 musil;
#X text 129 216 @;
#X text 135 216 iem.at;
#X text 98 238 Graz \, Austria;
#X text 50 205 (c) Thomas Musil 2000 - 2006;
#X connect 0 0 4 0;
#X connect 1 0 3 0;
#X connect 2 0 1 0;
#X connect 5 0 0 0;
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