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

SYNOPSIS
    hostname  [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [-i] [--ip-
    address] [--long] [-s] [--short] [-y] [--yp] [--nis] [-n] [--node]

    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]

    dnsdomainname [-v]
    nisdomainname [-v]
    ypdomainname [-v]

DESCRIPTION
    Hostname is the program that is used to either set or display the cur-
    rent 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 sys-
    tem 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 dns-
    domainname 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 con-
    tents 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 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.

OPTIONS
    -a, --alias
    Display the alias name of the host (if used).

    -d, --domain
    Display the name of the DNS domain.  Don't 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.

    -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 success-
    fully.

    -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/hosts

AUTHOR
    Peter Tobias, <tobias@et-inf.fho-emden.de>
    Bernd Eckenfels, <net-tools@lina.inka.de> (NIS and manpage).
    Steve Whitehouse, <SteveW@ACM.org> (DECnet support and manpage).