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Re:Fish: A command line shell for the 90s by rgoulter on Saturday October 26, 2019 @05:18AM (#21362670)
AFAIR the problems using fish tend to be when other programs (e.g. vim or whatever) try and interact with the shell and it's non-POSIX compliant.

The "expect it to work, didn't" is more on the user's side, going from e.g. bash to fish.

Re:Fish: A command line shell for the 90s by pmarin on Saturday October 26, 2019 @05:42AM (#21362763)
I know it was just an example but on any Vi clone you can set the default shell:

   :set shell=/bin/bash