Dear Nye Liu
/usr/lib/os-release
does have enough informations to read the current suite name of the
installed system.
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/;
SUPPORT_URL="https://www.debian.org/support;
BUG_REPORT_URL="https://bugs.debian.org/;
and running a single command like
"apt search base-files"
will give you the information if it is oldstable, stable, testing or
something else.
Example:
apt search base-files
Sortierung... Fertig
Volltextsuche... Fertig
base-files/oldstable,now 10.3+deb10u10 amd64 [installiert]
Debian base system miscellaneous files
oldstable is in the line base-files/oldstable.
If you combine both, you will know the stable/testing to suite name
mapping of the current installed system.
I hope this helps.
Best Regards
Oliver
