I am using debian 7.0 and I added "debian-transmission" to the group "pi" with:

usermod -a -G pi debian-transmission

I made this change because transmission was not able to write the pi mounted hdd. Later I realised that pi is also belongs to sudo. My question is: does debian-transmission belong also to sudo supplementary group just because became to member of pi group which belongs to sudo, or with the above mentioned command I put only the member of pi group?


Sounds like you are getting confused between the pi user and the pi group. You cannot add a group to a group, only users. There is a group with the same name as a user, the groups the user is in have no effect on the users that are in the group.

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