[問] How to know the version of Debian?

After installation of Sarge, any command to display the Debian version?

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cat /etc/debian_version

cat /etc/debian_version

How come it is testing/unstab

How come it is testing/unstable?
I have stable and testing in sources.list, so now I am running the sid version, but where is unstable coming from?

Before dist-upgrade, it was 3.1 already. After dist-upgrade, it becomes testing/unstable.

/etc/debian_version is in pa

/etc/debian_version is in package base-files.
When you upgrade package base-files to unstable or testing, /etc/debian_version will upgrade.