Can't update hosts file on mac

Question

When I try to save changes made in /etc/hosts file on mac i get this error:

"hosts" E212: Can't open file for writing

How can I update it?

Answer 1

I found the solution:

just use "sudo" before vi hosts (it will ask for administrator password). By doing this I, basically, open hosts file with Administrator privileges:

$ sudo vi hosts

and the after modifications :wq works just fine!

Answer 2

Launch the Terminal

  $ sudo vi /etc/hosts

and after the modifications

 :wq!

Answer 3

我的问题是我在运行sudo vi etc/hosts而不是sudo vi /etc/hosts hosts¯_（ツ）_ /¯