I ran into those problems too initially, but I've learned to avoid them. The version of Bash on Macs is version 3.2.57 iirc. This page has documentation of whic

I ran into those problems too initially, but I've learned to avoid them. The version of Bash on Macs is version 3.2.57 iirc. This page has documentation of which features were introduced in v3, v4 (https://tldp.org/LDP/abs/html/bash2.html https://tldp.org/LDP/abs/html/bash2.html). What I personally do is write POSIX shell, then add in things like arrays, $BASH_SOURCE, printf %q, and a few other handy features that have been around for a while. To test it, there is an official Docker image for Bash v3 (https://hub.docker.com/_/bash https://hub.docker.com/_/bash).