清空unity历史记录

最近升级到ubuntu1204，感觉unity其实还是蛮好用的，不过有很多功能还需要完善，如没法清楚历史记录等。

其实用命令还是可以清除的：

一、删除历史文档：
rm ~/.local/share/zeitgeist/activity.sqlite
zeitgeist-daemon --replace

二、不记录历史：
echo "LOCKED from edits - use chattr -i to re allow" > ~/.local/share/recently-used.xbel && sudo chattr +i ~/.local/share/recently-used.xbel

三、清除gnome-mplayer和totem等播放器中的“最近打开”的历史记录：
rm -v ~/.local/share/recently-used.xbel

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顺带查了一下zeitgeist的资料：（维基百科http://en.wikipedia.org/wiki/Zeitgeist_(framework)）

Zeitgeist is a service which logs the users's activities and events, anywhere from files opened to websites visited and conversations. It makes this information readily available for other applications to use in form of timelines and statistics. It is able to establish relationships between items based on similarity and usage patterns by applying data association algorithms such as "Winepi" and "A Priori"

Zeitgeist is the main engine and logic behind GNOME Activity Journal which is currently seen to become one of the main means of viewing and managing activities in GNOME version 3.0.^[1][2]