ken@titan ~/tmp/pm_11150231_dir_rand_select
$ ls -1R
.:
a.x
b.y
c.z
inc1
inc2
skip

./inc1:
g.w
h.x
i.y
j.z

./inc2:
k.u
l.v
m.w
n.x
o.y
p.z

./skip:
d.x
e.y
f.z