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mapfile callback

From: Chris F.A. Johnson
Subject: mapfile callback
Date: Fri, 17 Jul 2009 22:41:55 -0400 (EDT)
User-agent: Alpine 2.00 (NEB 1167 2008-08-23)

   mapfile callback code is executed in a subshell.

   Would it be possible to make it execute in the current shell?

   With mapfile -c1, this would make it possible to work on a file without an
   explicit loop, making it much faster.

   Chris F.A. Johnson                      <http://cfaj.freeshell.org>
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)

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