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-.\" Copyright (c) 1987, 1990, 1993
-.\" The Regents of the University of California. All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\" @(#)hostname.7 8.2 (Berkeley) 12/30/93
-.\" $FreeBSD: src/share/man/man7/hostname.7,v 1.7 2004/07/03 18:29:23 ru Exp $
-.\"
-.\" 2008-06-11, mtk, Taken from FreeBSD 6.2 and modified for Linux.
-.\"
-.TH hostname 7 2023-11-11 "Linux man-pages 6.7"
-.SH NAME
-hostname \- hostname 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 "example"
-subdomain of the "com" domain would be represented as "monet.example.com".
-.P
-Each element of the hostname must be from 1 to 63 characters long and the
-entire hostname, including the dots, can be at most 253 characters long.
-Valid characters for hostnames are
-.BR ASCII (7)
-letters from
-.I a
-to
-.IR z ,
-the digits from
-.I 0
-to
-.IR 9 ,
-and the hyphen (\-).
-A hostname may not start with a hyphen.
-.P
-Hostnames are often used with network client and server programs,
-which must generally translate the name to an address for use.
-(This task is generally performed by either
-.BR getaddrinfo (3)
-or the obsolete
-.BR gethostbyname (3).)
-.P
-Hostnames are resolved by the NSS framework in glibc according
-to the
-.B hosts
-configuration in
-.BR nsswitch.conf (5).
-The DNS-based name resolver
-(in the
-.B dns
-NSS service module) resolves them in the following fashion.
-.P
-If the name consists of a single component, that is, contains no dot,
-and if the environment variable
-.B 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.
-.P
-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.
-.P
-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.example.com, the name lithium.cchem will be checked first
-as lithium.cchem.cs.example and then as lithium.cchem.example.com.
-lithium.cchem.com 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
-.BR resolver (5)).
-.SH SEE ALSO
-.BR getaddrinfo (3),
-.BR gethostbyname (3),
-.BR nsswitch.conf (5),
-.BR resolver (5),
-.BR mailaddr (7),
-.BR named (8)
-.P
-.UR http://www.ietf.org\:/rfc\:/rfc1123.txt
-IETF RFC\ 1123
-.UE
-.P
-.UR http://www.ietf.org\:/rfc\:/rfc1178.txt
-IETF RFC\ 1178
-.UE
-.\" .SH HISTORY
-.\" Hostname appeared in
-.\" 4.2BSD.