Today, I dug out an old Lex Light fanless PC which I haven't used for years. The first thing I had to do was find out the version of Debian it was running which I normally do by checking the contents of the sources.list file. I wondered if there was an easier way to find out the current version and indeed there is:
cat /etc/debian_version wheezy/sid
I don't know why I never noticed that file before.
After a bit more searching online I discovered there was another way to find this information (and more):
lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux testing (wheezy) Release: testing Codename: wheezy
You learn something new every day!