Have two users collaborate in a directory
Solution 1:
Your umask needs to be set so files by default have permissions for groups to read, write and execute. The default umask on Ubuntu, 0002 is adequate.
You then set the setgid bit so files and directories that are created in the shared directory will automatically be assigned the common group (admins in your example).
- Make sure the shared directory is owned by the group
admin - Set the
setgidbit:chmod g+s /mnt/data