projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright (c) 1987, 1990, 1993 |
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| a9cd9cb7 | 4 | .\" %%%LICENSE_START(BSD_4_CLAUSE_UCB) |
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33 | .\" |
| 34 | .\" @(#)hostname.7 8.2 (Berkeley) 12/30/93 | |
| 35 | .\" $FreeBSD: src/share/man/man7/hostname.7,v 1.7 2004/07/03 18:29:23 ru Exp $ | |
| 36 | .\" | |
| 37 | .\" 2008-06-11, mtk, Taken from FreeBSD 6.2 and modified for Linux. | |
| 38 | .\" | |
| 474c44f3 | 39 | .TH HOSTNAME 7 2010-11-07 "Linux" "Linux Programmer's Manual" |
| 06b00cff | 40 | .SH NAME |
| ddaec46d | 41 | hostname \- hostname resolution description |
| 06b00cff MK |
42 | .SH DESCRIPTION |
| 43 | Hostnames are domains, where a domain is a hierarchical, dot-separated | |
| 44 | list of subdomains; for example, the machine monet, in the Berkeley | |
| 474c44f3 | 45 | subdomain of the EDU domain would be represented as "monet.Berkeley.EDU". |
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46 | |
| 47 | Hostnames are often used with network client and server programs, | |
| 48 | which must generally translate the name to an address for use. | |
| 49 | (This task is generally performed by either | |
| 50 | .BR getaddrinfo (3) | |
| 51 | or the obsolete | |
| 52 | .BR gethostbyname (3).) | |
| 53 | Hostnames are resolved by the Internet name resolver in the following | |
| 54 | fashion. | |
| 55 | ||
| 56 | If the name consists of a single component, that is, contains no dot, | |
| 57 | and if the environment variable | |
| 58 | .B HOSTALIASES | |
| 59 | is set to the name of a file, | |
| 60 | that file is searched for any string matching the input hostname. | |
| 61 | The file should consist of lines made up of two white-space separated strings, | |
| 62 | the first of which is the hostname alias, | |
| 63 | and the second of which is the complete hostname | |
| 64 | to be substituted for that alias. | |
| 65 | If a case-insensitive match is found between the hostname to be resolved | |
| 66 | and the first field of a line in the file, the substituted name is looked | |
| 67 | up with no further processing. | |
| 68 | ||
| 69 | If the input name ends with a trailing dot, | |
| 70 | the trailing dot is removed, | |
| 71 | and the remaining name is looked up with no further processing. | |
| 72 | ||
| 73 | If the input name does not end with a trailing dot, it is looked up | |
| 74 | by searching through a list of domains until a match is found. | |
| 75 | The default search list includes first the local domain, | |
| 76 | then its parent domains with at least 2 name components (longest first). | |
| 77 | For example, | |
| 78 | in the domain CS.Berkeley.EDU, the name lithium.CChem will be checked first | |
| 79 | as lithium.CChem.CS.Berkeley.EDU and then as lithium.CChem.Berkeley.EDU. | |
| 80 | Lithium.CChem.EDU will not be tried, as there is only one component | |
| 81 | remaining from the local domain. | |
| 82 | The search path can be changed from the default | |
| 83 | by a system-wide configuration file (see | |
| 84 | .BR resolver (5)). | |
| 85 | .SH SEE ALSO | |
| 86 | .BR gethostbyname (3), | |
| 87 | .BR resolver (5), | |
| 88 | .BR mailaddr (7), | |
| 89 | .BR named (8) | |
| 90 | .\" .SH HISTORY | |
| 91 | .\" Hostname appeared in | |
| 92 | .\" 4.2BSD. |