Assign group permission to newly created files
Directory /media/data/torrents/ has permissions 775, user yzt, group transmission
yzt and debian-transmission are members of the group transmission.
transmission-daemon is run by debian-transmission, and the new files it downloads have permissions 644, owner debian-transmission, group transmission. This is a problem, because I can't later move the files as my user, yzt, and need to be switching to root to change the permissions/ownership to be able to do so.
Using sticky bit I could copy it to anywhere else, but I'm interested on actually moving the file, not just copying it. I could run transmission-daemon as yzt and problem solved, but I rather have that internet facing service running by a limited user, just in case some vulnerability is found on Transmission.
So my question is, how can I set that every new file created under /media/data/torrents/ has permissions 775 like its parent directory?