Merge pull request #654 from geekpi/master

[Translating] 12 Advanced Commands For Linux Server Admins
Update 2013：The Golden Year for Linux – 10 Biggest Linux Achievements.md
翻译中

by Timeszoro
Merge pull request #655 from yechunxiao19/patch-1

Update 2013：The Golden Year for Linux – 10 Biggest Linux Achievements.md
Merge pull request #656 from Timeszoro/master

翻译中
Translate by SteveArcher
Merge pull request #657 from SteveArcher/master

Translate by SteveArcher
[Translating] userdel Command - Delete User Account from Linux system