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  • zsh is pretty popular in some circles these days. csh/tcsh has historically had a large following, but I don't think you see much of it today. And there's a whole bundle of lesser-known shells... Commented Feb 24, 2017 at 19:28
  • Modularity. With builtins, you'd need to recompile or re-install the shell each time a change was made to one of those builtins. Commented Feb 25, 2017 at 7:02