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If an owner can read and write and the group can read and execute, can the owner execute the file? Do file permissions stack?

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Let's try:

$ touch test.sh
$ chmod 650 test.sh
$ ls -lh
-rw-r-x---  1 lorenzob lorenzob    0 Sep 10 00:01 test.sh
$ ./test.sh
bash: ./test.sh: Permission denied

It seems that he can not!

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