How to delete recent history in Natty

Recent history shows up in the files and folders lens in the Unity Launcher. To delete
the recent history, open the terminal and type:
sudo rm ~/.local/share/zeitgeist/activity.sqlite
sudo zeitgeist-daemon –replace
After that close terminal, log out and log in again.
Alternatively, you can install activity log manager, as detailed below:
sudo add-apt-repository ppa:zeitgeist/ppa
sudo apt-get update
sudo apt-get upgrade
zeitgeist-daemon –replace
sudo apt-get install activity-log-manager
Then look for the application in the applications lens.