Here’s the Deal
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When comparing mksh (MirBSD Korn Shell) vs Eshell (Emacs SHell), the Slant community recommends Eshell (Emacs SHell) for most people. In the question“What are the best UNIX shells?” Eshell (Emacs SHell) is ranked 4th while mksh (MirBSD Korn Shell) is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Very fast
mksh is very light on resources it needs to use and as a result it's quite fast. It also gets better results consistently than other alternatives when comparing benchmarks.
Pro Can invoke almost any elisp function loaded in Emacs
Pro Written in emacs lisp
Cons
Con Development is pretty slow
Mksh is part of MirBSD which is barely even being developed anymore nowadays.