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The easiest way on how to check what Debian version you are running is to simply read a content of /etc/issue file. Example:
root@debian:~# cat /etc/issue
Debian GNU/Linux 9 \n \l
However, the above command may not show the current Debian update point releases. Thus you may get more accurate info with the following linux command:
root@debian:~# cat /etc/debian_version
9.0
Next, you can check for /etc/os-release release file: