Strange Hosts file

It should have happened twice,

The appearance is that the edited/etc/hosts file cannot be used.

Ping host name, no response.

That is, the record is invalid.

It all looks normal, and the first feeling should be a special character.

Vim: Set list, you can see that there is an empty and ^i behind the IP (indicates \ t)

I can't see what's coming.

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Then delete the "empty", manually fill a space,

Then the problem is solved.

Oh? Md5sum after the results are different oh,

So hexdump-c to see the difference between the two, found that there is a problem in the place of more than a C2 a0

That's 10 binary 194 and 160.

This is the legendary UTF8 space.

Strange Hosts file