dash isn't a fully-featured interactive shell, and would be a major step backward from bash. At least with zsh, Apple are moving forward on a feature basis. (

dash isn't a fully-featured interactive shell, and would be a major step backward from bash. At least with zsh, Apple are moving forward on a feature basis. (And I say this as someone who's still stubbornly set on bash over that newfangled zsh nonsense ;-) I'm less familiar with fish, but based on a very fuzzy awareness, it's at least fully-featured. I do encounter dash on a few systems. It's the default shell on my OpenWRT networking kit, for example. I've installed bash where those systems have enough storage to accommodate it.