/usr/lib/s9fes/help/draw-tree is in scheme9 2010.11.13-2.
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 | S9 LIB (draw-tree object) ==> unspecific
Print a tree structure resembling a Scheme datum. Each cons
cell is represented by [o|o] with lines leading to their car
and cdr parts. Conses with a cdr value of () are represented
by [o|/].
(draw-tree '((a) (b . c) (d e))) ==> unspecific
Output: [o|o]---[o|o]---[o|/]
| | |
[o|/] | [o|o]---[o|/]
| | | |
a | d e
|
[o|o]--- c
|
b
|