[PATCH] RFC: shell-safe version of string_sub()?

[David Collier-Brown]

Nicolas Williams wrote:
> You're right about most scripts. In shell scripts one must be religious
> about using double quotes wherever variables are referenced, especially
> if those varfiables may contain "wierd" characters (that includes
> space), unless one is specifically trying to split a variable's value
> (and even then...).

	Just for clarity, you might call it 
	string_sub_requoted instead of _sh, as the user
	would then see that it it just requotes string 
	args, rather than thinking it was all they needed 
	for the shell.

	<ObligatoryHistory> All Multics active functions
	(shell `` operations) did requoting, and there was 
	an explicit active function called requote that did
	nothing else but requote its arguements.
	</ObligatoryHistory>

--dave
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