Follow-up Comment #3, bug #14748 (project findutils):
Think of the converse, using the same example as before. What does "! -perm
/000" match?
"! -perm -+x" matches all files where any x bit is clear, or 000 and 100.
"! -perm /+x" matches all files where all x bits are clear, or 000.
Therefore,
"! -perm --x" matches all files where any bits in the mask are clear (there
are no bits), or nothing at all (good, that was the opposite of "-perm --x"
matching everything).
"! -perm /-x" matches all files where all bits in the mask are clear (there
are no bits), or nothing at all.
I still argue that -perm --x and -perm /-x should be identical.
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