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HOSTNAME(1)                Linux Programmer's Manual               HOSTNAME(1)



NAME
       hostname - show or set the system's host name
       dnsdomainname - show the system's DNS domain name


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

       hostname [-v] [-F filename] [--file filename] [hostname]

       hostname [-v] [-h] [--help] [-V] [--version]

       dnsdomainname [-v]


DESCRIPTION
       Hostname is used to either set or display the current  host  or  domain
       name  of  the system.  This name is used by many of the networking pro-
       grams 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.

       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 or the NIS/YP domain name.  Note that this is effec-
       tive only until the next  reboot.   Edit  /etc/hostname  for  permanent
       change.

       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 network address(es) of the host.

       -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.

NOTES
       The address families hostname tries when looking up the  FQDN,  aliases
       and  network  addresses of the host are determined by the configuration
       of your resolver.  For instance, on GNU Libc systems, the resolver  can
       be  instructed  to  try IPv6 lookups first by using the inet6 option in
       /etc/resolv.conf.

FILES
       /etc/hosts /etc/hostname This file should only contain domain name  and
       not the full FQDN.

AUTHORS
       Peter Tobias, <tobiasATet-inf.de>
       Bernd Eckenfels, <net-toolsATlina.de> (NIS and manpage).



net-tools                         28 Jan 1996                      HOSTNAME(1)