When /etc/avahi/aliases is missing a final newline char, the added entry is combined with the last entry. about avahi-aliases

[bjacobel]

In addition, using avahi-remove-alias will collapse all aliases in /etc/avahi/aliases (aside from the one being removed) into a single line.

$> cat /etc/avahi/aliases
a.local
b.local
c.local

$> sudo avahi-remove-alias c.local
publishing << a.localb.local >>
done

$> cat /etc/avahi/aliases
a.localb.local