/usr/lib/pd/extra/sigpack/rectify~-help.pd is in pd-sigpack 0.0.4.2-3.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #N canvas 381 374 379 281 10;
#N canvas 0 0 450 300 (subpatch) 0;
#X array rect 44100 float 0;
#X coords 0 1 44099 -1 100 70 1;
#X restore 231 159 graph;
#X msg 30 116 bang;
#X obj 62 75 osc~ 1.345;
#X obj 75 133 tabwrite~ osc;
#N canvas 0 0 450 300 (subpatch) 0;
#X array osc 44100 float 0;
#X coords 0 1 44099 -1 100 70 1;
#X restore 230 72 graph;
#X text 340 68 1;
#X text 333 124 -1;
#X text 60 35 flips negative values to positive;
#X text 342 153 1;
#X text 334 213 -1;
#X obj 62 201 tabwrite~ rect;
#X text 277 244 sIgpAck 0.01;
#X obj 62 165 rectify~;
#X text 205 256 2002 www.weiss-archiv.de;
#X text 60 13 ---rectify~---;
#X connect 1 0 3 0;
#X connect 1 0 10 0;
#X connect 2 0 3 0;
#X connect 2 0 12 0;
#X connect 12 0 10 0;
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