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hostname command man page

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] [-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.


       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. Only when the
       hostname -s is called will gethostbyname(3) be called.  The  difference
       in gethostname(2) and gethostbyname(3) is that gethostbyname(3) is net-
       work aware, so it consults  /etc/nsswitch.conf  and  /etc/host.conf  to
       decide whether to  read  information in  /etc/sysconfig/network  or
       /etc/hosts the hostname is also set  when  the network interface  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 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.

       -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 /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@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  28 Jan 1996   HOSTNAME(1)

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