# hostname

## NAME



           hostname - show or set the system's host name
           dnsdomainname - show the system's DNS domain name
           domainname - show or set the system's NIS/YP domain name
           nisdomainname - show or set system's NIS/YP domain name
           nodename - show or set the system's DECnet node name
           ypdomainname - show or set the system's NIS/YP domain name
    


## SYNOPSIS



           **hostname**[**-v**] [**-s** |**--short**]
    
           **hostname**[**-v**] [**-a** |**--alias**] [**-d** |**--domain**] [**-f** |**--fqdn** |**--long**]
           [**-i** |**--ip-address**]
    
           **hostname**[**-v**] [**-y** |**--yp** |**--nis**] [**-n** |**--node**]
    
           **hostname**[**-v**] [**-F filename** |**--file filename**] [_newname_]
    
           **domainname**[**-v**] [**-F filename** |**--file filename**] [_newname_]
    
           **nodename**[**-v**] [**-F filename** |**--file filename**] [_newname_]
    
           **hostname**[**-v** |**--verbose**] [**-h** |**--help**] [**-V** |**--version**]
    
           **dnsdomainname**[**-v**]
           **nisdomainname**[**-v**]
           **ypdomainname**[**-v**]
    


## DESCRIPTION



           **Hostname** is the program that is used to either set or display the
           current host, domain or node name of the system.  These names are
           used by many of the networking programs to identify the machine.
           The domain name is also used by NIS/YP.
    
       **GET NAME**
           When called without any arguments, the program displays the
           current names:
    
           **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.
    
           **nodename** will print the DECnet node name of the system as returned
           by the **getnodename**(2) function.
    
           **dnsdomainname** will print the domain part of the FQDN (Fully
           Qualified Domain Name). The complete FQDN of the system is
           returned with **hostname --fqdn**.
    
       **SET NAME**
           When called with one argument or with the **--file** option, the
           commands set the host name, the NIS/YP domain name or the node
           name.
    
           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 by reading the
           contents of a file which contains the host name, e.g.
           _/etc/hostname_).
    
       **THE FQDN**
           You can't change the FQDN (as returned by **hostname --fqdn**) or the
           DNS domain name (as returned by **dnsdomainname**) with this command.
           The FQDN of the system is the name that the resolver(3) returns
           for the host name.
    
           Technically: The FQDN is the canonical name returned by
           **gethostbyname2**(2) when resolving the result of the gethostname(2)
           name. 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. If **hosts** is the first
           lookup method, you can change the FQDN in _/etc/hosts_.
    


## OPTIONS



           _-a, --alias_
                  Display the alias name of the host (if used).
    
           _-d, --domain_
                  Display the name of the DNS domain (this is the FQDN
                  without the segment up to the first dot). This is
                  equivalent to using the **dnsdomainname** command.
    
           _-F, --file filename_
                  Read the new 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 name including the DNS domain.
    
           _-h, --help_
                  Print a usage message and exit.
    
           _-i, --ip-address_
                  Display the IP address(es) of the host.
    
           _-n, --node_
                  Display the DECnet node name. If a parameter is given (or
                  **--file name**) the root can also set a new node name.
    
           _-s, --short_
                  Display the short host name. This is the host name cut at
                  the first dot.
    
           _-V, --version_
                  Print version information on standard output and exit
                  successfully.
    
           _-v, --verbose_
                  Be verbose and tell what's 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.
    


## FILES



           **/etc/hostname /etc/hosts /etc/host.conf**
    


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