I am testing many Linux distribution especially Debian based Linux. With this many Linux version, I cannot remember which Debian version I am using. But do you know how to check which Debian version you are using? There is a useful command to print the detailed Linux version. With this command we can get a complete information about the Distribution, Description, Release version and also the codename.
Try to execute this command on Debian:
It will print something like this
dhani@debian:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 7.5 (wheezy)
Its pretty infromative.