Command to know the installed Debian version?

There are a few ways you can know the installed Debian version of your Linux System,

Using lsb_release command

The lsb_release package is not pre-installed, you will need to get it using apt-get package manager.

# lsb_release --all
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.1 LTS
Release:	22.04
Codename:	jammy
Know Debian Release Version Details

Using the debian_version config file

root@ubuntu cat /etc/debian_version

Debian version history details:
Debian 1.1 (Buzz)
Debian 1.2 (Rex)
Debian 1.3 (Bo)
Debian 2.0 (Hamm)
Debian 2.1 (Slink)
Debian 2.2 (Potato)
Debian 3.0 (Woody)
Debian 3.1 (Sarge)
Debian 4.0 (Etch)
Debian 5.0 (Lenny)
Debian 6.0 (Squeeze)
Debian 7 (Wheezy)
Debian 8 (Jessie)
Debian 9 (Stretch)
Debian 10 (Buster)
Debian 11 (Bullseye)
Debian 12 (Bookworm)


sid -> Debian Unstable -> rolling development version

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