Agreed. If you don't test your script in other shells and on other platforms, why advertise compatibility. And not just the script, but also the programs called

Agreed. If you don't test your script in other shells and on other platforms, why advertise compatibility. And not just the script, but also the programs called. I got burned by supposedly "portable" scripts by the whole Ubuntu dash disaster, and again when I started using Mac OS X, and then again once I used Cygwin and msys2 on Windows. I do keep portability in mind when writing shell scripts to ease porting later, but without testing there's really no way to be sure "/bin/sh" is right. And some of the Bash features such as arrays are legitimately useful.