Linux ubuntu16
open the terminal, input the command:
sudo -i gedit /etc/hosts file
click enter key, then input your password, click enter key, the hosts file will be open, now you can edit it.
Windows (win7/win8)
C:\Windows\System32\driver\etc\hosts
open the hosts, now you can edit it.
在Linux/Windows系统上编辑/etc/hosts文件
原文：http://www.cnblogs.com/woniu123/p/6078356.html