The author glosses over the differences between bash and zsh (and fails to mention that Apple used to use bash, and switched to zsh). The author should have st

The author glosses over the differences between bash and zsh (and fails to mention that Apple used to use bash, and switched to zsh). The author should have stressed that these and many other shells implement the POSIX shell, which is fundamental to them all from a scripting perspective. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...