It is possible to define the EOS_MGM_URL=root://eosproject.cern.ch variable beforehand. In which case, you would not need root://eosproject.cern.ch in the EOS command.
In the example above:
*`egroup:cernbox-project-swanee-writers:rwx+d` means that users in this e-group can read, write, execute and delete files/folders in this folder
*`egroup:cernbox-project-swanee-readers:rx` means that users in this e-group can read files/folders in the folder
*`u:99090:rwx+d` means that the user with userid `99090` can read, write, execute, delete files/folders in the folder. The user was shared this folder using the Web interface.