/usr/lib/pd/extra/hcs/unsetenv-help.pd is in pd-hcs 0.1-2.
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 12 13 14 15 16 17 18 | #N canvas 315 28 551 341 10;
#X obj 261 152 setenv;
#X msg 261 54 bang;
#X symbolatom 260 199 0 0 0 0 - - -;
#X msg 59 51 bang;
#X msg 294 120 symbol SHELL;
#X msg 381 120 symbol PATH;
#X msg 461 120 symbol HOME;
#X obj 59 134 unsetenv HOME;
#X msg 134 107 symbol SHELL;
#X text 107 51 bang unsets;
#X connect 0 0 2 0;
#X connect 1 0 0 0;
#X connect 3 0 7 0;
#X connect 4 0 0 1;
#X connect 5 0 0 1;
#X connect 6 0 0 1;
#X connect 8 0 7 1;
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