>Is the "empty" #! (no explicit pathname given) ok ?

Anything which cases "execve" to return ENOEXEC is fair game.

>How would I select, as admin/user, which 'default' that'd evaluate to ?

You don't; because a POSIX compliant shell will run such a script
in a POSIX compliant shell all you need to do is start with a POSIX
compliant shell.

(Or perhaps you do by running in a POSIX compliant shell)

If such scripts are to be run from makefiles, you will need to include
the special target .POSIX:

.POSIX:

Casper
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