How to create a directory, where users can delete only their own files, but one user can delete anyone's files?

Consider the following setup: # two users in groups sales useradd edwin useradd santos groupadd sales usermod -aG sales edwin usermod -aG sales santos # two users in group account useradd serene useradd alex groupadd account usermod -aG account serene usermod -aG account alex # every group has its own directory with full access mkdir -p ./groups/sales ./groups/account cd ./groups chown :account ./account chown :sales ./sales chmod g+rwx ./account ./sales The task states: > Users have permissions to delete only their own files, but alex is the general manager, so user alex has access to delete all users' files. Now users should be able to only delete their own files, so I do: chmod +t /groups/account /groups/sales But now I have a problem. Alex is admin, and should be able to delete _anyone's_(!) files. So I do for example: setfactl -a u:alex:rwx /groups/sales /groups/account But this does not help: [root@localhost groups]# getfacl sales/ # file: sales/ # owner: root # group: sales # flags: --t user::rwx user:alex:rwx group::rwx mask::rwx other::r-x [root@localhost groups]# sudo -u edwin touch sales/file [root@localhost groups]# sudo -u alex rm -f sales/file rm: cannot remove 'sales/file': Operation not permitted Is it possible to apply sticky flag to all except one user?