user@debian:~$ hostname --fqdn
debian.hsd1.mi.comcast.net.
user@debian:~$ cd /etc
user@debian:/etc$ more hosts
127.0.0.1	localhost
127.0.1.1	debian.hsd1.mi.comcast.net.	debian

/////////////////////////////////////////////////////////
localhost.localdomain
user@Elive[~]$ cd /etc/hosts
bash: cd: /etc/hosts: Not a directory
user@Elive[~]$ cd /etc
user@Elive[/etc]$ more hosts
127.0.0.1 localhost.localdomain localhost Elive
//////////////////////////////////////////////////////////
user@debian:~$ hostname --fqdn
localhost.localdomain
user@debian:~$ cd /etc
user@debian:/etc$ more hosts
127.0.0.1 localhost.localdomain localhost debian
/////////////////////////////////////////////////////////
debian:/home/user# hostname --fqdn
debian.hsd1.mi.comcast.net.
debian:/home/user# cd /etc
debian:/etc# more hosts
127.0.0.1       localhost
127.0.1.1       debian.hsd1.mi.comcast.net.     debian