No, that's just an exaggerated caricature of what I'm saying. I'm only saying you should avoid using modern things needlessly. This means, don't do it when the

No, that's just an exaggerated caricature of what I'm saying. I'm only saying you should avoid using modern things needlessly. This means, don't do it when the POSIX-compliant syntax also serves your needs. e.g., don't do [[ -f "$foo" ]] when you could just as easily do [ -f "$foo" ]. And if you do need to use Bash-specific features, make sure it's safe enough that foreseeable misuses will fail safely. Or when that's not possible, try to mitigate it somehow (maybe with a comment, or by putting in some extra dynamic checks, or other solutions you can think of). And this goes for other things too, not just Bash. Probably outside programming too.