/usr/lib/pd/extra/zexy/abs~.pd is in pd-zexy 2.2.6-2.
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 | #N canvas 0 0 450 300 10;
#X obj 30 88 inlet~;
#X obj 30 136 outlet~;
#X obj 31 113 expr~ abs($v1);
#X text 36 44 [abs~];
#X text 33 169 using [expr~] is slower than doing it in C...;
#X text 319 21 part of zexy;
#X text 250 261 updated for zexy-2.0;
#X text 33 187 therefore we _also_ provide [abs~] as external.;
#X connect 0 0 2 0;
#X connect 2 0 1 0;
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