kernel recognizing #! scripts

[ado at elsie.UUCP]

	One advantage to having the kernel recognize #! scripts is
	that set-uid/gid mode works.  Just as with a binary, the
	kernel recognizes this mode and starts the shell or whatever with
	appropriate effective uid/gid.  On 4.1bsd, scripts without
	#! ignore set-uid mode. . .
		Rich Altmaier, Integrated Office Systems.
		decwrl!ios!richa

Note, however, that in a binary program you can issue a system call to
reset the user (or group) id to the "real" (as distinct from the effective) id.
I've yet to learn of a way to do this in shell scripts.  Maybe the unavailable
korn shell supports it.
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