The commands for modifying file permissions and ownership are:
chmod – change permissions
chown – change ownership.
The breakdown of permissions looks like this:
The 'other' entry is the dangerous one, as it effectively gives everyone permission for the folder/file. The permissions you can give to a file or folder are:
Using the -R switch is important. If you have a number of sub-folders and files within the SHARE directory, and you want the permissions to apply from the parent object (the containing folder) to the child objects (the sub-folders and files), you must use the -R (recursive) switch so the same permissions are applied all the way to the deepest folder, contained within the parent.
sudo chown -R bethany /DATA/SHARE