_AS_PATH_WALK doc

[Derek Robert Price]

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What is it about the _AS_PATH_WALK interface that is keeping it private:

# _AS_PATH_WALK([PATH = $PATH], BODY)
# -----------------------------------
# Walk through PATH running BODY for each `as_dir'.
#
# Still very private as its interface looks quite bad.
#
# `$as_dummy' forces splitting on constant user-supplied paths.
# POSIX.2 field splitting is done only on the result of word
# expansions, not on literal text.  This closes a longstanding sh security
# hole.  Optimize it away when not needed, i.e., if there are no literal
# path separators.

I would like to document AS_PATH_WALK and use it in the CVS test suite.

Derek

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