/usr/share/puredata/doc/5.reference/bang-help.pd is in puredata-core 0.48.1-3.
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 | #N canvas 118 56 581 250 12;
#X obj 49 182 print;
#X text 107 183 Output is in the printout window.;
#X obj 66 15 bang;
#X text 112 14 - SEND "BANG" MESSAGE;
#X msg 61 105 walk the cat;
#X msg 49 79 45;
#X obj 49 152 bang;
#X text 336 233 updated for Pd version 0.27;
#X text 23 42 Outputs a "bang" message whatever it receives.;
#X connect 4 0 6 0;
#X connect 5 0 6 0;
#X connect 6 0 0 0;
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