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From: Linda Walsh <bash@tlinx.org>
Newsgroups: gnu.bash.bug
Subject: bash expanding relative paths in auto-complete
Date: Thu, 13 Aug 2015 15:34:09 -0700
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Xref: csiph.com gnu.bash.bug:11349

in bash 4.3.39,
if I type a command, (like "."(source)) and a relative path
like : ../conf<complete>,
it expands the relative pathname to absolute pathnames.

This is bad .. since I reuse relative commands in different
absolute places.

It didn't used to do this, and it's a potential security problem,
since if you reuse a command to configure something from before, and
don't catch that it's not using the relative path, it could run
the wrong command...