清理Ubuntu拉圾及启动项

3、清除所有已删除包的残馀配置文件
dpkg -l |grep ^rc|awk ‘{print $2}’ |sudo xargs dpkg -P
如果 如下错误，证明你的系统中没有残留配置文件了，无须担心。
dpkg: –purge needs at least one package name argument
Type dpkg –help for help about installing and deinstalling packages [*];
Use `dselect’ or `aptitude’ for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg –force-help for a list of forcing options;
Type dpkg-deb –help for help about manipulating *.deb files;
Type dpkg –license for copyright license and lack of warranty (GNU GPL) [*].
Options marked [*] produce a lot of output – pipe it through `less’ or `more’ !