Hostname from /etc/hostname & DNS domain name

 Hostname from /etc/hostname & DNS domain name with parameter:

cmd:

[oracle@servername ~]$ hostname -followed by parameter

-s, --short            short host name
-a, --alias            alias names
-i, --ip-address       addresses for the host name
-I, --all-ip-addresses all addresses for the host
-f, --fqdn, --long     long host name (FQDN)
-A, --all-fqdns        all long host names (FQDNs)
-d, --domain           DNS domain name
-y, --yp, --nis        NIS/YP domain name
-b, --boot             set default hostname if none available
-F, --file             read host name or NIS domain name from given file