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HOSTNAME(7)	   FreeBSD Miscellaneous Information Manual	   HOSTNAME(7)

NAME
     hostname -- host name resolution description

DESCRIPTION
     Hostnames are domains, where a domain is a	hierarchical, dot-separated
     list of subdomains; for example, the machine monet, in the	Berkeley sub-
     domain of the EDU subdomain of the	Internet would be represented as

	   monet.Berkeley.EDU

     (with no trailing dot).

     Hostnames are often used with network client and server programs, which
     must generally translate the name to an address for use.  (This function
     is	generally performed by the library routine gethostbyname(3).)  Host-
     names are resolved	by the Internet	name resolver in the following fash-
     ion.

     If	the name consists of a single component, i.e., contains	no dot,	and if
     the environment variable ``HOSTALIASES'' is set to	the name of a file,
     that file is searched for any string matching the input hostname.	The
     file should consist of lines made up of two white-space separated
     strings, the first	of which is the	hostname alias,	and the	second of
     which is the complete hostname to be substituted for that alias.  If a
     case-insensitive match is found between the hostname to be	resolved and
     the first field of	a line in the file, the	substituted name is looked up
     with no further processing.

     If	the input name ends with a trailing dot, the trailing dot is removed,
     and the remaining name is looked up with no further processing.

     If	the input name does not	end with a trailing dot, it is looked up by
     searching through a list of domains until a match is found.  The default
     search list includes first	the local domain, then its parent domains with
     at	least 2	name components	(longest first).  For example, in the domain
     CS.Berkeley.EDU, the name lithium.CChem will be checked first as
     lithium.CChem.CS.Berkeley.EDU and then as lithium.CChem.Berkeley.EDU.
     Lithium.CChem.EDU will not	be tried, as there is only one component
     remaining from the	local domain.  The search path can be changed from the
     default by	a system-wide configuration file (see resolver(5)).

SEE ALSO
     gethostbyname(3), resolver(5), mailaddr(7), named(8)

HISTORY
     Hostname appeared in 4.2BSD.

FreeBSD	9.3		       December	30, 1993		   FreeBSD 9.3

NAME | DESCRIPTION | SEE ALSO | HISTORY

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