How to completely remove a file from git history

While working with any version control system such as git it is quite possible that you or anyone in the team that you are working with accidentally commit an unnecessary large sized file and nobody notices until too long when hundreds of commits have been made and deleting that large-sized file alone from the latest commit wouldn't matter much. That file must be removed completely from the commits history.

The post at http://www.ducea.com/2012/02/07/howto-completely-remove-a-file-from-git-history/ completely explains the process of handling such a situations.