当然あるものと思っていたら、、、
$ which tree $
なーい。
ということで、HomeBrew で入れましたよ、と。（port でも良かったけど）
$ brew install tree Warning: It appears you have MacPorts or Fink installed. Software installed with other package managers causes known problems for Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again. ==> Downloading http://mama.indstate.edu/users/ice/tree/src/tree-1.6.0.tgz ######################################################################## 100.0% ==> make ==> make install /usr/local/Cellar/tree/1.6.0: 4 files, 108K, built in 3 seconds $ which tree /usr/local/bin/tree
で無事インストール完了。一瞬です。