/usr/lib/pd/extra/list-abs/list-unitvec.pd is in pd-list-abs 0.1-1.
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 | #N canvas 344 49 431 402 10;
#X obj 221 167 s \$0-reset;
#X obj 213 296 expr 1/sqrt($f1);
#X obj 141 366 outlet;
#X obj 141 145 inlet;
#X obj 141 334 list-math *;
#X obj 213 261 list-dotprod;
#X obj 141 168 t a a a b;
#X text 20 58 list-unitvec;
#X text 38 78 make a unit vector out of any list \, ignoring non-float
elements (i.e. normalize a list geometrically);
#X connect 1 0 4 1;
#X connect 3 0 6 0;
#X connect 4 0 2 0;
#X connect 5 0 1 0;
#X connect 6 0 4 0;
#X connect 6 1 5 0;
#X connect 6 2 5 1;
#X connect 6 3 0 0;
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