fedora 16: grub 2
fedora 16:: pulseaudio
fedora 16:: 字体美化
fedora 16: service启动时间
fedora 16: 服务
fedora 16: 无线网络的开关
fedora 17:启动ssh服务
package-cleanup --leaves
package-cleanup --orphans
package-cleanup --oldkernels --keepdevel