/usr/lib/puredata/extra/hilbert~-help.pd is in puredata-extra 0.46.7-3.
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 | #N canvas 156 234 600 488 12;
#X obj 67 124 hilbert~;
#X obj 66 85 osc~ 440;
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#X obj 67 274 tabwrite~ out-left;
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#X msg 137 188 bang \; pd dsp 1;
#X floatatom 66 57;
#X text 71 319 The Hilbert transform (the name is abused here according to computer music tradition) puts out a phase quadrature version of the input signal suitable for signal sideband modulation via complex-mod~.;
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