Скачать или смотреть SGID | SETGID explained | Special file permission in Linux | Part-2

The setgid attribute is set on binary executable files at the group level. With this bit set, the file is executed by non-owners with the exact same privileges as that of the group members.

The setgid bit can also be set on group-shared directories to allow files and subdirectories created underneath to automatically inherit the directory’s owning group.
This saves group members who are sharing the directory contents from changing the group ID for every new file and subdirectory that they add. The standard behavior for new files and subdirectories is to always receive the creator’s group.

With the argument +2000, the chmod command enables setgid on the specified file without altering any existing underlying permissions.

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