/usr/share/puredata/doc/5.reference/line~-help.pd is in puredata-core 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 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #N canvas 121 54 813 370 12;
#X obj 33 301 snapshot~;
#X obj 21 8 line~;
#X obj 33 226 line~;
#X floatatom 33 324 0 0 0 0 - - -;
#X obj 43 274 metro 100;
#X obj 43 249 r start;
#X msg 550 21 \; pd dsp 1 \; start bang;
#X msg 34 106 1 1000;
#X text 89 105 a pair of numbers starts a ramp;
#X msg 60 176 2;
#X text 91 150 a single number jumps to value;
#X msg 61 200 stop;
#X text 104 199 "stop" message freezes line~ at its current value;
#X msg 60 153 0;
#X msg 43 128 0 5000;
#X text 10 28 The line~ object generates linear ramps whose levels
and timing are determined by messages you send it. The messages may
be a single target value (causing the output to jump to the target)
or a target and a time in milliseconds (to start a new ramp.);
#X text 644 36 Click to start;
#X text 639 94 Click to stop;
#X text 185 300 see also:;
#X obj 271 302 line;
#X msg 550 75 \; pd dsp 0 \; start 0;
#X text 75 7 - audio ramp generator;
#X text 576 335 updated for version 0.33;
#X obj 317 302 vline~;
#X connect 0 0 3 0;
#X connect 2 0 0 0;
#X connect 4 0 0 0;
#X connect 5 0 4 0;
#X connect 7 0 2 0;
#X connect 9 0 2 0;
#X connect 11 0 2 0;
#X connect 13 0 2 0;
#X connect 14 0 2 0;
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