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Just enter "bash" when you need bash and exit it once you're done. Barely need this but sometimes it's useful.

Fish imho offers superb usability, wouldn't want to miss it.

You lose all the fish goodies when you do this, no?

you only need to paste a line or two of bash. it's what I did when I have a problem with some online help that put a line that only works on bash

exactly.

Some commands are compatible with bash, but not compatible with zsh. I do the same thing when using zsh.