hostname man page on OPENSTEP

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HOSTNAME(7)							   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
       subdomain of the EDU subdomain of the ARPANET 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).)   Hostnames  are  resolved  by  the  internet	  name
       resolver in the following fashion.

       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 an 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-sensitive  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 in
       the local domain and its parent domains until either a match  is	 found
       or fewer than 2 components of the local domain remain.  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
       the there is only one component remaining from the local domain.

SEE ALSO
       gethostbyname(3), resolver(5), mailaddr(7), named(8), RFC883

4.2 Berkeley Distribution      November 21, 1987		   HOSTNAME(7)
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