/usr/share/puredata/doc/5.reference/line-help.pd is in puredata-core 0.48.1-3.
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 38 39 40 41 42 43 44 45 46 47 48 49 50 | #N canvas 747 154 700 651 12;
#X floatatom 22 428 8 0 0 0 - - -, f 8;
#X msg 32 231 0 1000;
#X msg 47 253 39;
#X obj 66 15 line;
#X text 106 14 - ramp generator;
#X msg 23 208 1 1000;
#X text 94 220 send a pair to ramp to a new value;
#X text 97 255 send a single number to jump;
#X text 39 601 see also:;
#X obj 139 601 line~;
#X msg 58 278 stop;
#X text 103 280 "stop" message to stop output;
#X obj 22 402 line 0 100;
#X text 120 408 creation arguments:;
#X text 279 400 1 initial value;
#X msg 67 308 set 5;
#X text 120 308 "set" to change value (and stop) without output;
#X obj 185 601 vline~;
#X floatatom 91 364 0 0 0 0 - - -;
#X floatatom 91 340 0 0 0 0 - - -;
#X text 126 340 first inlet sets next ramp time (cleared when ramp
starts!);
#X text 125 366 second inlet sets grain (not cleared \, acts as normal
inlet);
#X text 278 416 2 time grain in milliseconds (20 by default);
#X msg 235 547 \; pd compatibility 0.47;
#X text 54 470 COMPATIBILITY NOTE: in Pd versions before 0.48 \, a
stop message followed by a new ramp message would incorrectly ramp
from the previous start. It now ramps from wherever in the previous
segment the object was stopped at. To get the old behavior \, set "compatibility"
to 0.47 or below in Pd's command line or by a message:, f 74;
#X text 442 599 updated for Pd version 0.48;
#X text 22 36 The line object takes (target \, time) pairs and ramps
(slews) to the specified target over the time given \, updating its
output at a "grain rate" given by the creation argument. If you don't
specify a time \, line jumps immediately to the target. Note that the
inlet does not remember old values (unlike every other inlet in Pd)
-- sending a float causes a jump in the output regardless of whatever
time value was specified in some previous message. If the line object
receives a message specifying some new target before reaching the previous
one \, it takes off from its current value., f 70;
#X connect 1 0 12 0;
#X connect 2 0 12 0;
#X connect 5 0 12 0;
#X connect 10 0 12 0;
#X connect 12 0 0 0;
#X connect 15 0 12 0;
#X connect 18 0 12 2;
#X connect 19 0 12 1;
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