Section (1) hostname
hostname — set or print the name of the current host system
Print or set the hostname of the current system.
display this help and exit
output version information and exit
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Full documentation <https://www.gnu.org/software/coreutils/hostname>
or available locally via: info _zsingle_quotesz_(coreutils) hostname invocation_zsingle_quotesz_
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Section (7) hostname
hostname — hostname resolution 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.
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 ASCII(7) letters from
z, the digits from
9, and the hyphen (−). A hostname may
not start with a hyphen.
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 getaddrinfo(3) or the obsolete gethostbyname(3).)
Hostnames are resolved by the NSS framework in glibc
according to the
hosts configuration in
DNS-based name resolver (in the
dns NSS service module)
resolves them in the following fashion.
If the name consists of a single component, that is,
contains no dot, and if the environment variable
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.
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.
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 resolver(5)).
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(#)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.