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When applying permissions, there are two concepts to understand − When assigning permissions using the octal method, use a 3 byte number such as: 760.
The number 760 translates into: Owner: rwx; Group: rw; Other (or world) no permissions.
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Before we give a real-world example, let's first understand the permissions as they apply to directories and files.
If we re-assign the entire permission set, we take away all other custom permissions assigned to every sub-directory.
Hence, it will cause a problem for both the administrator and the user of the system.
Let's change all the subdirectory assignments in /var/www/students/ so the owning group is the students group.
Then assign the root of students to the professors group. Terry Thomas the owner of the students directory, since he is tasked as being in-charge of all Computer Science academia at the school.