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HOSTNAME(1)	      Linux System Administrator's Manual	   HOSTNAME(1)

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 gethost‐
       name(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).

net-tools			  2008-10-03			   HOSTNAME(1)
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