Yeah, known issue - see http://bts.grml.org/grml/issue180

I once wrote a patch against grml-shlib which makes it POSIX compatible, though
Gebi (author and maintainer of grml-shlib and grml-crypt) does not want to use
POSIX-only. ;) There's a fix for grml-crypt (simply using /bin/bash instead of
/bin/sh) pending in our version control - just not packaged and uploaded yet.

Gebi, care to release 0.16 (currently tagged with UNRELEASED) so we fix this
issue? :)

thx! && regards,
-mika-