BSD 2.11 - man page for hosts (bsd section 5)
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hosts - host name data base
The hosts file contains information regarding the known hosts on the network. For each
host a single line should be present with the following information:
official host name
Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the
beginning of a comment; characters up to the end of the line are not interpreted by rou-
tines which search the file.
When using the name server named(8), this file provides a backup when the name server is
not running. For the name server, it is suggested that only a few addresses be included
in this file. These include address for the local interfaces that ifconfig(8C) needs at
boot time and a few machines on the local network.
This file may be created from the official host data base maintained at the Network Infor-
mation Control Center (NIC), though local changes may be required to bring it up to date
regarding unofficial aliases and/or unknown hosts. As the data base maintained at NIC is
incomplete, use of the name server is recommend for sites on the DARPA Internet.
Network addresses are specified in the conventional ``.'' notation using the inet_addr()
routine from the Internet address manipulation library, inet(3N). Host names may contain
any printable character other than a field delimiter, newline, or comment character.
gethostbyname(3N), ifconfig(8C), named(8)
Name Server Operations Guide for BIND
4.2 Berkeley Distribution May 14, 1986 HOSTS(5)
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