I remember having read that FreeBSD's sed supports some of GNU's options now "for Linux compatibility" or something.
Well, the zsh is quite easy, just fire up your usual options (colored ls, extended globbing, completion/history setup) and that's it, basically. I admit that scripting the zsh is complicated at times, at least compared to the syntax of the bash (and, to a lesser extent, the tcsh), though.
The ksh is pretty new to me. I've read that it features most options of the zsh; I haven't had any time to look into it yet.
(But yes, OSX is linux-y. All that GUI!)
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