bindfs allow multiple local users to read and write (create, delete, rename, modify...) all files (including newly created ones) from a shared directory and its subdirectories.

You can specify users by user name or group, it is very flexible.

The basic syntax (from the wiki page) is:

Creating the shared directory

e.g. in the /home directory:

sudo mkdir /home/shared

NOTE: If the directory already exist skip this step.

Allow only root to access it, we will set the permissions later with bindfs:

sudo chown root: /home/shared

sudo chmod 0700 /home/shared

Setting the permissions with bindfs

Now use the bindfs command to mount the shared directory with altered permissions. Syntax of the command:

bindfs [options] dir mountpoint

Example:

sudo bindfs -o perms=0700,mirror-only=user1:user2:user3 /home/shared /home/shared

Options explained:

perms=0700 sets the permissions to 0700 (read/write for the owner, none for the group and other)

mirror-only=user1:user2:user3 user1, user2 and user3 will see itself as the owner of the files (user names are separated by a colon).

To automatically mount at boot, use fstab . Open fstab for editing with sudo nano /etc/fstab and add a line

fstab example:

bindfs#/home/shared /home/shared fuse perms=0700,mirror-only=user1:user2:user3 0 0

See - Ubuntu wiki bindfs for group options and additional details.