Using `find -perm` to find when a permission is not set

问题

I want to find the non-readable files in my directory (eg the files with g-r). So I tried this:

find . -perm -g-r

It shows me all of the files?? So I tried this:

find . -perm -g+r

And it showed me only the readable files. It appears that -perm -g-r matches all files. I'm using CentOS 5.5. Am I doing something wrong? It doesn't look like -perm -g-r does anything useful.

回答1:

Try:

find . ! -perm -g+r

回答2:

If you want to find files that are non-readable by you, you could use

find . ! -readable

回答3:

You were able to see all files when you executed the below instruction, because you were executing it as root.

find . -perm -g-r

Try executing as a normal user.

来源：https://stackoverflow.com/questions/4382599/using-find-perm-to-find-when-a-permission-is-not-set