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Bash on Mac is deprecated and zsh is sufficiently different. Plus on minimal installs of containers or in VM one may not even have it with /bin/sh provided by dash or similar minimal shell.

So my rule of thumb if one cannot use plain /bin/sh and must depend on bash-specific things, one better use a proper scripting language.

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> and zsh is sufficiently different

But generally not with stuff that one typically uses for scripting. In most ways, it's a superset of bash.

Besides word-splitting on unquoted variables being turned off with default settings (which is turned on when zsh is called as bash/sh with a symlink or similar), what other differences do you think would be common to find when running random bash scripts with zsh?

Built-in bash 3 on a Mac is deprecated. But you can use Homebrew to install Bash 5 and make it the new default. Which is what many developers do.

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