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           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


           hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [-A] [--all-
           fqdns] [-i]  [--ip-address]  [-I]  [--all-ip-addresses]  [--long]  [-s]
           [--short] [-y] [--yp] [--nis]
           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]


           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
           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.
           dnsdomainname will print the domain part of the FQDN  (Fully  Qualified
           Domain Name). The complete FQDN of the system is returned with hostname
           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
           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.
           If  a machine has multiple network interfaces/addresses or is used in a
           mobile environment, then it may either have multiple FQDNs/domain names
           or  none  at  all.  Therefore  avoid  using  hostname  --fqdn, hostname
           --domain and dnsdomainname.  hostname --ip-address is  subject  to  the
           same limitations so it should be avoided as well.


           -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
           -F, --file filename
                  Read the host name from  the  specified  file.  Comments  (lines
                  starting with a '#') are ignored.
                  addresses may resolve to the same name, therefore the output may
                  contain duplicate entries. Do not make any assumptions about the
                  order of the output.
           -h, --help
                  Print a usage message and exit.
           -i, --ip-address
                  Display  the  IP  address(es)  of the host. Note that this works
                  only if the host name can be resolved. Avoid using this  option;
                  use hostname --all-ip-addresses instead.
           -I, --all-ip-addresses
                  Display  all  network addresses of the host. This option enumer-
                  ates all configured addresses on  all  network  interfaces.  The
                  loopback  interface  and  IPv6 link-local addresses are omitted.
                  Contrary to option -i, this option does not depend on name reso-
                  lution.  Do not make any assumptions about the order of the out-
           -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-
           -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.


           /etc/hosts /etc/sysconfig/network


           Note  that  hostname  doesn't change anything permanently. After reboot
           original names from /etc/hosts are used again.


           Peter Tobias, <>
           Bernd Eckenfels, <> (NIS and manpage).
           Steve Whitehouse, <> (DECnet support and manpage).

    net-tools 28 Jan 1996 HOSTNAME(1)


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