ftp://ftp.cs.tut.fi/pub/src/unix/commands/directory_trees/  direct

[DIR]vtree/  direct  69 twin directories
7.12 KB  1987-07-30vertical-tree.c
3.33 KB  1988-01-28fsdu.c
[DIR]displaytree/  direct
322 B  1998-06-22.cache  8 mirrors