find . -type d
can be used to find all directories below some start point. But it returns the current directory (.) too, which may be
POSIX 7 solution:
find . ! -path . -type d
For this particular case (.), golfs better than the mindepth solution (24 vs 26 chars), although this is probably slightly harder to type because of the !.
To exclude other directories, this will golf less well and requires a variable for DRYness:
D="long_name"
find "$D" ! -path "$D" -type d
My decision tree between ! and -mindepth:
! for portability..? Throw a coin.long_name? Use -mindepth.