You're replying to a comment by John.

John Permalink
February 28, 2011, 13:02

Another reason they are more powerful is the +X, which sets execute only if execute is set for other permission classes. This is incredibly useful when doing recursive chmods. Say I want to give group and other read write exec access to a directory that only user can access at current. You could do go+rwx, but that would make all files executable which is not what you want. If instead you do go+rwX, all of the dirs and actual executable files will be set to x (assuming you have access to all of the dirs).

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