How to see Raspberry Pi OS version on Raspberry PI

You can check the version of Raspberry Pi OS (formerly Raspbian) that is currently installed on your Raspberry Pi by using the command cat /etc/os-release. This command will display a file called os-release, which contains information about the operating system, including the version number.

Alternatively, you can use the command lsb_release -a, this command will show you the version of the Linux distribution and other related information.

Here's an example of the output you might see:

PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
ID=raspbianrnID_LIKE=debianrnHOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

You can see that the version is 10 (buster)

Additionally, you can also use the command uname -a to see the version of the kernel, uname command gives information about the system and the kernel.

Please keep in mind that this is a general command and the output may change depending on the version of Raspberry Pi OS you are using.