FQDN confusion

[Brian McKee]

What is supposed to be in /etc/hostname?  The hostname? or the FQDN?
And what is usually placed in the /etc/hosts file after the 127.0.1.1
entry - FQDN or hostname?

What's started me on this was '\h' and '\H' in $PS1 were both just the hostname.
Further poking -  hostname and hostname --fqdn both return the same,
hostname -d returns null...

If I put the FQDN in the /etc/hosts file then hostname -f and hostname
-d work as expected,
but $PS1="\H" still just shows hostname...


Dazed and confused,

Brian