/usr/share/puredata/doc/3.audio.examples/D09.shepard.tone.pd is in puredata-doc 0.47.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X text 462 208 START;
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#X msg 446 225 \; dropoff 10 \; pitch 60 \; interval 120 \; metro 1
\; rev 84 \; revtime 87 \; incr -2 \; pd dsp 1;
#X text 27 7 SHEPARD TONE;
#X text 339 804 updated for Pd version 0.37;
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#X text 25 31 This patch is a bank of 20 sinusoids \, arranged so that
their frequencies sweep upward or downward in parallel \, and their
amplitudes fade in and out so that each one is quiet when it wraps
around from one end to the other. The overall "phase" computed here
is added to each voice's relative phase (its creation argument). The
"incr" parameter controlls how fast the phase changes \, "dropoff"
the slope at which the amplitudes fall off at the ends \, "pitch" the
center pitch of the cluster \, "interval" the number of (tenths of
halftones) between successive voices \, and "rev" and "revtime" the
reverberator at bottom.;
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