lsb_release -a でバージョンが確認出来ます
pi@raspberrypi:~ $ lsb_release -a No LSB modules are available. Distributor ID: Raspbian Description: Raspbian GNU/Linux 8.0 (jessie) Release: 8.0 Codename: jessie
Raspberry Piバージョン確認
Raspberry Pi
Raspberry Pi