> I don't want to use zsh specific features in my scripts
How is this a worry?
The topline in your bash script is '#!/bin/bash'
Which tells the system 'run this with bash'.
How is this a worry?
The topline in your bash script is '#!/bin/bash'
Which tells the system 'run this with bash'.
Example, I _think_ / (recursive globbing) works by default in zsh but not in bash. If you have / in a bash script without setting the right options then your script won't work and you will have no idea why until you've wasted a lot of time debugging.
#!/bin/bash
I've been running zsh on my local system, and happily writing [bash, csh, perl, ruby] using this trick.