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umask doesn't accept some valid symbolic modes


From: Andreas Schwab
Subject: umask doesn't accept some valid symbolic modes
Date: Wed, 22 Feb 2023 15:33:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux)

According to
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html
the symbolic mode can contain more than one action concatenated, for
example "g+r-x", which is the same as "g+r,g-x".

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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