通过日志，记录自己的特权操作。该功能可能对于多用户系统更有意义。
参考：http://blog.csdn.net/ganglia/article/details/14004267

效果如下：
$ sudo cat /var/log/sudo.log
Feb 2 09:57:50 : ahe : TTY=pts/1 ; PWD=/home/ahe ; USER=root ; COMMAND=/bin/cat
/var/log/sudo.log
Feb 2 19:55:05 : ahe : TTY=pts/0 ; PWD=/home/ahe ; USER=root ;
COMMAND=/usr/bin/aptitude install mate-screensaver -R
Feb 2 20:57:03 : ahe : TTY=pts/1 ; PWD=/home/ahe ; USER=root ; COMMAND=/bin/cat
/var/log/sudo.log
Feb 2 20:58:16 : ahe : TTY=pts/1 ; PWD=/home/ahe ; USER=root ;
COMMAND=/usr/bin/aptitude install shutter libgoo-canvas-perl -R
Feb 2 20:58:57 : ahe : TTY=pts/2 ; PWD=/home/ahe ; USER=root ;
COMMAND=/usr/bin/gufw
Feb 2 20:59:46 : ahe : TTY=pts/2 ; PWD=/home/ahe ; USER=root ;
COMMAND=/usr/bin/gvim /usr/share/applications/gufw.desktop
Feb 2 21:00:35 : ahe : TTY=pts/2 ; PWD=/home/ahe ; USER=root ; COMMAND=/bin/cat
/var/log/sudo.log

运行过什么命令，一目了然，只是不能知道是哪个普通用户运行的，可惜了，有待深入研究。

$ cat .bash_history |grep sudo
sudo gvim /etc/default/rcS
man sudo
man sudo |grep logo
man sudo |grep log
sudo aptitude update
sudo aptitude
sudo cat /var/log/sudo.log
sudo aptitude
sudo echo "deb http://mirrors.ustc.edu.cn/debian-multimedia jessie main non-free" >> /etc/apt/sources.list
sudo cat /var/log/sudo.log
sudo aptitude install shutter libgoo-canvas-perl -R
sudo gufw
sudo gvim /usr/share/applications/gufw.desktop
sudo cat /var/log/sudo.log
sudo gvim /etc/vim/vimrc
sudo aptitude install mate-screensaver -R