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HOSTNAME(1)                Linux Programmer'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


SYNOPSIS
       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]


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) func-
       tion.


       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.


       dnsdomainname will print the domain part of the FQDN (Fully Qualified Domain Name).
       The complete FQDN of the system is returned with hostname --fqdn.


       The function gethostname(2) is used to get the hostname.  When the hostname -a, -d,
       -f or -i is called will gethostbyname(3) be called.   The  difference  in  gethost-
       name(2)  and gethostbyname(3) is that gethostbyname(3) is network aware, so it con-
       sults /etc/nsswitch.conf and /etc/host.conf to decide whether to  read  information
       in /etc/sysconfig/network or /etc/hosts

       To  add another dimension to this, the hostname is also set when the network inter-
       face is brought up.


   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  in  /etc/rc.d/rc.inet1  or
       /etc/init.d/boot  (normally  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  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 envi-
       ronment, then it may either have multiple FQDNs/domain names or none at all. There-
       fore  avoid  using  hostname --fqdn, hostname --domain and dnsdomainname.  hostname
       --ip-address is subject to the same limitations so it should be avoided as well.


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. See  the  warnings  in  section  THE  FQDN
              above, and avoid using this option; use hostname --all-fqdns instead.

       -A, --all-fqdns
              Displays  all  FQDNs  of  the machine. This option enumerates all configured
              network addresses on all configured network interfaces, and translates  them
              to  DNS domain names. Addresses that cannot be translated (i.e. because they
              do not have an appropriate reverse DNS entry) are skipped. Note that differ-
              ent addresses may resolve to the same name, therefore the output may contain
              duplicate entries. Do not make any assumptions about the order of  the  out-
              put.

       -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 enumerates all con-
              figured 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 resolution. Do not make any assumptions about  the  order
              of the output.

       -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/hosts /etc/sysconfig/network

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

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




net-tools                         28 Jan 1996                      HOSTNAME(1)

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