hostname [-v] [-F filename] [--file filename] [hostname]
domainname [-v] [-F filename] [--file filename] [name]
nodename [-v] [-F filename] [--file filename] [name]
hostname [-v] [-h] [--help] [-V] [--version]
hostname will print the name of the system as returned by the gethostname(2) function.
domainname, nisdomainname, ypdomainname will print the name of the system as returned by the getdomainname(2) function. This is also known as the YP/NIS domain name of the system.
dnsdomainname will print the domain part of the FQDN (Fully Qualified Domain Name). The complete FQDN of the system is returned with hostname --fqdn.
is used to get the hostname. Only when the
hostname -s is called will
be called. The difference in
is network aware, so it consults
/etc/host.conf to decide whether to read information in
.To add another dimension to this, the hostname is also set when the network interface is brought up.
Note, that only the super-user can change the names.
It is not possible to set the FQDN or the DNS domain name with the dnsdomainname command (see THE FQDN below).
The host name is usually set once at system startup in /etc/rc.d/rc.inet1 or /etc/init.d/boot (normally by reading the contents of a file which contains the host name, e.g. /etc/hostname).
Technically: The FQDN is the name gethostbyname(2) returns for the host name returned by gethostname(2). The DNS domain name is the part after the first dot.
Therefore it depends on the configuration (usually in /etc/host.conf) how you can change it. Usually (if the hosts file is parsed before DNS or NIS) you can change it in /etc/hosts.
|Display the alias name of the host (if used).|
|Display the name of the DNS domain. Dont use the command domainname to get the DNS domain name because it will show the NIS domain name and not the DNS domain name. Use dnsdomainname instead.|
|-F, --file filename|
|Read the host name from the specified file. Comments (lines starting with a #) are ignored.|
|-f, --fqdn, --long|
|Display the FQDN (Fully Qualified Domain Name). A FQDN consists of a short host name and the DNS domain name. Unless you are using bind or NIS for host lookups you can change the FQDN and the DNS domain name (which is part of the FQDN) in the /etc/hosts file.|
|Print a usage message and exit.|
|Display the IP address(es) of the host.|
|Display the short host name. This is the host name cut at the first dot.|
|Print version information on standard output and exit successfully.|
|Be verbose and tell whats going on.|
|-y, --yp, --nis|
|Display the NIS domain name. If a parameter is given (or --file name ) then root can also set a new NIS domain.|