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+.TH HOSTNAME 1 "2009-09-16" "net-tools" "Linux Programmer's Manual"
+
+.SH NAME
+hostname \- show or set the system's host name
+.br
+domainname \- show or set the system's NIS/YP domain name
+.br
+ypdomainname \- show or set the system's NIS/YP domain name
+.br
+nisdomainname \- show or set the system's NIS/YP domain name
+.br
+dnsdomainname \- show the system's DNS domain name
+.br
+
+.SH SYNOPSIS
+.B hostname
+.RB [ \-a|\-\-alias ]
+.RB [ \-d|\-\-domain ]
+.RB [ \-f|\-\-fqdn|\-\-long ]
+.RB [ \-A|\-\-all-fqdns ]
+.RB [ \-i|\-\-ip-address ]
+.RB [ \-I|\-\-all-ip-addresses ]
+.RB [ \-s|\-\-short ]
+.RB [ \-y|\-\-yp|\-\-nis ]
+.br
+.B hostname
+.RB [ \-b|\-\-boot ]
+.RB [ \-F|\-\-file\ filename ]
+.RB [ hostname ]
+.br
+.B hostname
+.RB [ \-h|\-\-help ]
+.RB [ \-V|\-\-version ]
+.PP
+.B domainname
+.RB [ nisdomain ]
+.RB [ \-F\ file ]
+.br
+.B ypdomainname
+.RB [ nisdomain ]
+.RB [ \-F\ file ]
+.br
+.B nisdomainname
+.RB [ nisdomain ]
+.RB [ \-F\ file ]
+.PP
+.B dnsdomainname
+
+.SH DESCRIPTION
+.B Hostname
+is used to display the system's DNS name, and to display or set its hostname or
+NIS domain name.
+
+.SS "GET NAME"
+When called without any arguments, the program displays the current
+names:
+.LP
+.B hostname
+will print the name of the system as returned by the
+.BR gethostname (2)
+function.
+.LP
+.B domainname
+will print the NIS domainname of the system.
+.B domainname
+uses the
+.BR gethostname (2)
+function, while
+.B ypdomainname
+and
+.B nisdomainname
+use the
+.BR getdomainname (2).
+.LP
+.B dnsdomainname
+will print the domain part of the FQDN (Fully Qualified Domain Name). The
+complete FQDN of the system is returned with
+.B hostname \-\-fqdn
+(but see the warnings in section
+.B THE FQDN
+below).
+
+.LP
+The function 
+.BR gethostname(2)
+is used to get the hostname.  When the 
+.BR "hostname \-a, \-d, \-f or \-i" 
+is called will 
+.BR gethostbyname(3)
+be called.  The difference in 
+.BR gethostname(2)
+and
+.BR gethostbyname(3)
+is that
+.BR gethostbyname(5)
+is network aware, so it consults 
+.IR /etc/nsswitch.conf
+and
+.IR /etc/host.conf
+to decide whether to read information in
+.IR /etc/hostname
+or
+.IR /etc/hosts
+
+.SS "SET NAME"
+When called with one argument or with the
+.B \-\-file
+option, the commands set the host name or the NIS/YP domain name.
+.B hostname
+uses the
+.BR sethostname (2)
+function, while all of the three
+.BR domainname ,
+.B ypdomainname
+and
+.B nisdomainname
+use
+.BR setdomainname (2).
+Note, that this is effective only until the next reboot.
+Edit /etc/hostname for permanent change.
+.LP
+Note, that only the super-user can change the names.
+.LP
+It is not possible to set the FQDN or the DNS domain name with the
+.B dnsdomainname
+command (see
+.B THE FQDN
+below).
+.LP
+The host name is usually set once at system startup
+(normally by reading the contents of a file which contains
+the host name, e.g.
+.IR /etc/hostname ).
+
+.SS THE FQDN
+The FQDN (Fully Qualified Domain Name) of the system is the name that the
+.BR resolver (3)
+returns for the host name, such as,
+.IR ursula.example.com .
+It is usually the hostname followed by the DNS domain name (the part
+after the first dot).  You can check the FQDN using
+.B hostname \-\-fqdn
+or the domain name using
+.BR "dnsdomainname" .
+.LP
+You cannot change the FQDN with
+.B hostname
+or
+.BR dnsdomainname .
+.LP
+The recommended method of setting the FQDN is to make the hostname be
+an alias for the fully qualified name using
+.IR /etc/hosts ,
+DNS, or NIS. For example, if the hostname was "ursula", one might have a line in
+.I /etc/hosts
+which reads
+.LP
+.RS
+127.0.1.1    ursula.example.com ursula
+.RE
+.LP
+Technically: The FQDN is the name
+.BR getaddrinfo (3)
+returns for the host name returned by
+.BR gethostname (2).
+The DNS domain name is the part after the first dot.
+.LP
+Therefore it depends on the configuration of the resolver (usually in
+.IR /etc/host.conf )
+how you can change it. Usually the hosts file is parsed before DNS or
+NIS, so it is most common to change the FQDN in
+.IR /etc/hosts .
+.LP
+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
+.BR "hostname \-\-fqdn" ,
+.B hostname \-\-domain
+and
+.BR "dnsdomainname" .
+.B hostname \-\-ip-address
+is subject to the same limitations so it should be avoided as well.
+
+.SH OPTIONS
+.TP
+.I "\-a, \-\-alias"
+Display the alias name of the host (if used). This option is deprecated
+and should not be used anymore.
+.TP
+.I "\-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 IP entry) are skipped. Note that
+different 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.
+.TP
+.I "\-b, \-\-boot"
+Always set a hostname; this allows the file specified by \fI\-F\fR to be
+non-existent or empty, in which case the default hostname \fIlocalhost\fR
+will be used if none is yet set.
+.TP
+.I "\-d, \-\-domain"
+Display the name of the DNS domain.  Don't use the command
+.B domainname
+to get the DNS domain name because it will show the NIS domain name and
+not the DNS domain name. Use
+.B dnsdomainname
+instead. See the warnings in section
+.B THE FQDN
+above, and avoid using this option.
+.TP
+.I "\-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 \fI/etc/hosts\fR file. See the warnings in section
+.B THE FQDN
+above und use
+.B hostname \-\-all-fqdns
+instead wherever possible.
+.TP
+.I "\-F, \-\-file filename"
+Read the host name from the specified file. Comments (lines starting with
+a `#') are ignored.
+.TP
+.I "\-i, \-\-ip-address"
+Display the network address(es) of the host name. Note that this works only
+if the host name can be resolved. Avoid using this option; use
+.B hostname \-\-all-ip-addresses
+instead.
+.TP
+.I "\-I, \-\-all-ip-addresses"
+Display all network addresses of the host. This option enumerates all
+configured addresses on all network interfaces. The loopback interface and IPv6
+link-local addresses are omitted. Contrary to option \fI\-i\fR, this option
+does not depend on name resolution. Do not make any assumptions about the
+order of the output.
+.TP
+.I "\-s, \-\-short"
+Display the short host name. This is the host name cut at the first dot.
+.TP
+.I "\-V, \-\-version"
+Print version information on standard output and exit successfully.
+.TP
+.I "\-y, \-\-yp, \-\-nis"
+Display the NIS domain name. If a parameter is given (or
+.B \-\-file name
+) then root can also set a new NIS domain.
+.TP
+.I "\-h, \-\-help"
+Print a usage message and exit.
+.SH NOTES
+The address families
+.B 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
+.B inet6
+option in
+.BR /etc/resolv.conf .
+.SH FILES
+.B /etc/hostname
+Historically this file was supposed to only contain the hostname and not the
+full canonical FQDN. Nowadays most software is able to cope with a full FQDN
+here. This file is read at boot time by the system initialization scripts to
+set the hostname.
+.LP
+.B /etc/hosts
+Usually, this is where one sets the domain name by aliasing the host name to
+the FQDN.
+.SH AUTHORS
+Peter Tobias, <tobias@et-inf.fho-emden.de>
+.br
+Bernd Eckenfels, <net-tools@lina.inka.de> (NIS and manpage).
+.br
+Michael Meskes, <meskes@debian.org>
+.br