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+<code>
+HOSTS(5)                   Linux Programmer's Manual                  HOSTS(5)
+NAME
+       hosts - The static table lookup for host names
+SYNOPSIS
+       /etc/hosts
+DESCRIPTION
+       This  manual  page  describes  the format of the __________ file.  This
+       file is a simple text file that associates IP addresses with hostnames,
+       one line per IP address.  For each host a single line should be present
+       with the following information:
+              IP_address canonical_hostname [aliases...]
+       Fields of the entry are separated by any number of  blanks  and/or  tab
+       characters.   Text  from a "#" character until the end of the line is a
+       comment, and is ignored.  Host  names  may  contain  only  alphanumeric
+       characters, minus signs ("-"), and periods (".").  They must begin with
+       an  alphabetic  character  and  end  with  an  alphanumeric  character.
+       Optional aliases provide for name changes, alternate spellings, shorter
+       hostnames, or generic hostnames (for example, _________).
+       The Berkeley Internet Name Domain (BIND) Server implements the Internet
+       name  server  for UNIX systems.  It augments or replaces the __________
+       file or host name lookup, and frees a host from relying  on  __________
+       being up to date and complete.
+       In  modern  systems,  even though the host table has been superseded by
+       DNS, it is still widely used for:
+       bootstrapping
+              Most systems have a small host table  containing  the  name  and
+              address  information  for  important hosts on the local network.
+              This is useful when DNS is not running, for example during  sys-
+              tem bootup.
+       NIS    Sites  that  use NIS use the host table as input to the NIS host
+              database.  Even though NIS can be used with DNS, most NIS  sites
+              still  use the host table with an entry for all local hosts as a
+              backup.
+       isolated nodes
+              Very small sites that are isolated from the network use the host
+              table  instead of DNS.  If the local information rarely changes,
+              and the network is not connected to  the  Internet,  DNS  offers
+              little advantage.
+FILES
+       __________
+NOTES
+       Modifications  to this file normally take effect immediately, except in
+       cases where the file is cached by applications.
+   Historical Notes
+       RFC 952 gave the original format for the  host  table,  though  it  has
+       since changed.
+       Before  the advent of DNS, the host table was the only way of resolving
+       hostnames on the fledgling Internet.  Indeed, this file could  be  cre-
+       ated  from the official host data base maintained at the Network Infor-
+       mation Control Center (NIC), though local changes were  often  required
+       to  bring  it  up  to  date regarding unofficial aliases and/or unknown
+       hosts.  The NIC no longer maintains the hosts.txt files, though looking
+       around  at  the  time  of  writing  (circa  2000), there are historical
+       hosts.txt files on the WWW.  I just found three, from 92, 94, and 95.
+EXAMPLE
+.0.0.1       localhost
+.168.1.10    foo.mydomain.org       foo
+.168.1.13    bar.mydomain.org       bar
+.82.138.7    master.debian.org      master
+.237.226.90  www.opensource.org
+SEE ALSO
+       hostname(1), resolver(3), resolver(5), hostname(7), named(8),  Internet
+       RFC 952
+COLOPHON
+       This  page  is  part of release 2.77 of the Linux _________ project.  A
+       description of the project, and information about reporting  bugs,  can
+       be found at http://www.kernel.org/doc/man-pages/.
+Linux                             2002-06-16                          HOSTS(5)
+</code>

Carlos Maziero

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