Summary Create the Folder:

sudo mkdir /path/to/your/folder

Create Users and Set Passwords:

sudo adduser user1
sudo adduser user2
sudo adduser user3

Create a Group:

sudo groupadd mygroup

Add Users to the Group:

sudo usermod -aG mygroup user1
sudo usermod -aG mygroup user2
sudo usermod -aG mygroup user3

Change Group Ownership of the Folder:

sudo chown :mygroup /path/to/your/folder

Set Folder Permissions:

sudo chmod 770 /path/to/your/folder

Change the owner of /home/username/sharedfolder to newowner:

sudo chown newowner /home/username/sharedfolder

Change the owner to newowner and group to newgroup:

sudo chown newowner:newgroup /home/username/sharedfolder

To allow read, write, and execute permissions for the group:

sudo chmod 2770 /home/username/sharedfolder

Change Ownership Recursively:

sudo chown -R newowner:newgroup /home/username/sharedfolder

The setgid bit ensures that files and directories created within the folder inherit the group ownership of the directory

sudo chmod g+s /home/username/sharedfolder