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That's required by POSIX.1-2008. Link: <https://github.com/shadow-maint/shadow/pull/600> Cc: Christian Göttsche <cgzones@googlemail.com> Cc: Iker Pedrosa <ipedrosa@redhat.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Serge Hallyn <serge@hallyn.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>