:read allows piping shell stdout into a buffer

:read !ls<CR>

for example:

041a1acc.md
56653cb1.md
73dcbcc7.md
82ded935.md
9227847e.md
92598822.md
96fc3093.md
9b74f625.md
9db45ab6.md
aab45963.md
acc60422.md
b364352b.md
b926d9bd.md
c4e96daf.md
d2e178e0.md
da69e0f5.md
dc879f80.md
ec21e3f5.md
ec672cb5.md
fa6a31b4.md
index.md
neuron.dhall
static