pi@raspberrypi:~ $ groups debian-transmission
debian-transmission : debian-transmission sharedusb

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pi@raspberrypi:~ $ ls -ahl /media/usb
total 26G
drwxr-xr-x  6 pi   sharedusb 4.0K Mar 16 21:45 .
drwxr-xr-x  7 root root      4.0K Mar 16 23:29 ..
drwxr-xr-x  3 pi   sharedusb 4.0K Mar 16 21:45 cache
-rw-rw-rw-  1 pi   sharedusb 344K Mar 16 21:00 cache.db
drwxr-xr-x 22 pi   sharedusb  24K Mar 17 21:48 complete
-rw-rw-rw-  1 pi   sharedusb  25K Mar 13 20:52 config.ini
-rw-rw-rw-  1 pi   sharedusb 4.0K Mar 24  2016 failed.db
drwxr-xr-x  2 pi   sharedusb 4.0K Mar 16 23:49 incomplete
drwx------  2 pi   sharedusb  16K Oct 26  2015 lost+found
-rw-rw-rw-  1 pi   sharedusb 4.3M Mar 16 15:18 sickbeard.db
-rw-rw-rw-  1 pi   sharedusb  46M Feb 12  2016 sickrage-20160212212907.zip
-rw-rw-rw-  1 pi   sharedusb  59M Mar 16 21:27 sickrage-20170316212621.zip
-rw-r--r--  1 pi   sharedusb 125M Mar  9  2016 stackoverflow.com-Badges.7z
-rw-r--r--  1 pi   sharedusb 2.6G Mar  9  2016 stackoverflow.com-Comments.7z
-rw-r--r--  1 pi   sharedusb  14G Mar 10  2016 stackoverflow.com-PostHistory.7z
-rw-r--r--  1 pi   sharedusb  42M Mar 10  2016 stackoverflow.com-PostLinks.7z
-rw-r--r--  1 pi   sharedusb 8.3G Mar 10  2016 stackoverflow.com-Posts.7z
-rw-r--r--  1 pi   sharedusb 613K Mar 10  2016 stackoverflow.com-Tags.7z
-rw-r--r--  1 pi   sharedusb 188M Mar 10  2016 stackoverflow.com-Users.7z
-rw-r--r--  1 pi   sharedusb 578M Mar 10  2016 stackoverflow.com-Votes.7z
-rwxrw-rw-  1 pi   sharedusb  90M May 15  2015 Telerik_UI_for_ASP.NET_AJAX_2015_1_401_De