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Annotation of 43BSDTahoe/man/man7/hostname.7, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1987 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)hostname.7  6.1 (Berkeley) 11/21/87
                      6: .\"
                      7: .TH HOSTNAME 7 "November 21, 1987"
                      8: .UC 5
                      9: .SH NAME
                     10: hostname \- host name resolution description
                     11: .SH DESCRIPTION
                     12: Hostnames are domains, where a domain is a hierarchical, dot-separated
                     13: list of subdomains; for example, the machine monet, in the Berkeley
                     14: subdomain of the EDU subdomain of the ARPANET would be represented as
                     15: .br
                     16:                monet.Berkeley.EDU
                     17: .br
                     18: (with no trailing dot).
                     19: .PP
                     20: Hostnames are often used with network client and server programs,
                     21: which must generally translate the name to an address for use.
                     22: (This function is generally performed by the library routine
                     23: .IR gethostbyname (3).)
                     24: Hostnames are resolved by the internet name resolver in the following
                     25: fashion.
                     26: .PP
                     27: If the name consists of a single component, i.e. contains no dot,
                     28: and if the environment variable ``HOSTALIASES'' is set to the name of a file,
                     29: that file is searched for an string matching the input hostname.
                     30: The file should consist of lines made up of two white-space separated strings,
                     31: the first of which is the hostname alias,
                     32: and the second of which is the complete hostname
                     33: to be substituted for that alias.
                     34: If a case-sensitive match is found between the hostname to be resolved
                     35: and the first field of a line in the file, the substituted name is looked
                     36: up with no further processing.
                     37: .PP
                     38: If the input name ends with a trailing dot,
                     39: the trailing dot is removed,
                     40: and the remaining name is looked up with no further processing.
                     41: .PP
                     42: If the input name does not end with a trailing dot, it is looked up in
                     43: the local domain and its parent domains until either a match is found
                     44: or fewer than 2 components of the local domain remain.  For example,
                     45: in the domain CS.Berkeley.EDU, the name lithium.CChem will be checked first
                     46: as lithium.CChem.CS.Berkeley.EDU and then as lithium.CChem.Berkeley.EDU.
                     47: Lithium.CChem.EDU will not be tried, as the there is only one component
                     48: remaining from the local domain.
                     49: .SH SEE ALSO
                     50: gethostbyname(3), resolver(5), mailaddr(7), named(8), RFC883

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