To install unbuffer in OSX
There is the terminal command unbuffer in Linux Redhat, for instance.
I did not find it in homebrew.
How can you install unbuffer in OSX Yosemite 10.10.3?
unbuffer is part of the expect package:
brew install homebrew/dupes/expect
You may need to:
brew tap homebrew/dupes/expect
Before you can install it.
UPDATE: As of 2018 expect is available without prefix in homebrew, thus:
brew install expect
is all that is necessary.