This article is for the new users whom just like me! 🙂
I got a Raspberry Pi about half years ago, I’m pretty new in Linux world, so I rebuilt my pi over and over again whenever there was a new release…it takes lot of time to do it.
Thanks Safari(a online library for IT guys). Today I found a new way to do it on fly! Just run following two commands it will upgrade system automatically.

#apt-get update
This command line updates the latest repository information.

#apt-get upgrade
It’s upgrade all older packages to latest version.

It may takes long time to complete upgrading, you’d better make sure the SSH alive during that time.