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Diffstat (limited to 'share/man/man7/hostname.7')
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diff --git a/share/man/man7/hostname.7 b/share/man/man7/hostname.7 new file mode 100644 index 000000000000..713a8b155525 --- /dev/null +++ b/share/man/man7/hostname.7 @@ -0,0 +1,94 @@ +.\" 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 +.\" $FreeBSD$ +.\" +.Dd December 30, 1993 +.Dt HOSTNAME 7 +.Os +.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 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 +.Bx 4.2 . |