I've come to a confusion regarding the /etc/hosts file. Both of these version work:

1 example.com example

2 example.com

Which one is the correct one?

  • 1
    More information is needed. What exactly are you trying to do here? – Techie Joe Jun 27 '14 at 5:54
  • I'm trying to correctly configure my hosts file – Ryan M Jun 27 '14 at 5:58
  • 1
    is it for a website? Are you using it to test a website without DNS records being live? Just to be safe just assign one FQDN per line. If you have foo.com at you'd put an entry for www.foo.com on one line and foo.com on another line. – Techie Joe Jun 27 '14 at 6:00

They are both correct (for the syntax) but it depends on what you want.

The second one add an alias to with the name example meaning both example.com and example will resolve to that IP.

From the doc

This manual page describes the format of the /etc/hosts file. This file is a simple text file that associates IP addresses with hostnames, one line per IP address. For each host a single line should be present with the following information:

    IP_address canonical_hostname [aliases...]

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