File and Directory Protections
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The setgid bit on a directory (in the group-execute portion
represented as an s or S) forces all files to be created in the
directory with the group of the parent directory rather then the
user's primary group. This is the BSD file creation semantics rather
than SYSV.
By default Debian uses a umask of 755. It is a long and well known
Linux tradition to create home directories world readable as it
encourages a sharing environment. Users can always change the
permissions on their home directory or any subdirectory they want to
keep private.
To change this default behaviour edit /etc/adduser.conf to
change the DIR_MODE option.
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