Access Control Lists (ACLs)
Access control lists allow you to specify for any of your files/folders what other users may do with them. You can give read/write permissions on a per user basis and are not tied to the classical UNIX owner/group scheme.
Currently editing ACLs is only possible from the command line with the commands
setfacl and
getfacl. We will add a GUI for managing ACLs in the the future.
If you want to use ACLs please read
this introduction.