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+.\" Copyright (c) 1987, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)hostname.7	8.2 (Berkeley) 12/30/93
+.\"
+.Dd December 30, 1993
+.Dt HOSTNAME 7
+.Os BSD 4.2
+.Sh NAME
+.Nm hostname
+.Nd host name resolution description
+.Sh 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 Internet would be represented as
+.Pp
+.Dl monet.Berkeley.EDU
+.Pp
+(with no trailing dot).
+.Pp
+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
+.Xr gethostbyname  3  . )
+Hostnames are resolved by the Internet name resolver in the following
+fashion.
+.Pp
+If the name consists of a single component, i.e. contains no dot,
+and if the environment variable
+.Dq Ev 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.
+.Pp
+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.
+.Pp
+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 the 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
+.Xr resolver  5  ) .
+.Sh SEE ALSO
+.Xr gethostbyname 3 ,
+.Xr resolver 5 ,
+.Xr mailaddr 7 ,
+.Xr named 8
+.Sh HISTORY
+.Nm Hostname
+appeared in 4.2 BSD.