Update/Upgrade Packages

$ sudo apt-get update

$ sudo apt-get upgrade

UPGRADE internal package list. UPDATE packeges.

Removes Unused Packages

$ sudo apt-get remove

sudo apt-get clean

Check Debian Version

$ cat /etc/debian_version

Check OS Release Notes

$ cat /etc/os-release

Check Kernel Version

$ uname -a

Check Hardware Version

$ cat /proc/cpuinfo