This may be a bit of a noobish question, but I was taking a look at /etc/hosts on my new Xubuntu install and saw this:

```
127.0.0.1 localhost
127.0.1.1 myhostname

```

On most 'nixes I've used, the second line is omitted, and if I want to add my hostname to the hosts file, I'd just do this:

```
127.0.0.1 localhost myhostname

```

Is there a difference between these two files in any practical sense?