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, sch...@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
