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Hostname database
/etc/hosts
The hosts file contains information (e.g. IP addresses) regarding the known hosts on the network. For each host, a single line should be present with the following information:
internet_address official_host_name aliases
Items are separated by any number of blanks or Tabs, or both. A pound sign (#) indicates the beginning of a comment - any characters after a #, up to the end of the line, aren't interpreted by routines that search the file.
If you're using a name server, this file provides a backup when the server isn't running. In this case, you should include only a few addresses in this file. These would include addresses for the local interfaces that ifconfig needs at boot time and a few machines on the local network.
Hostnames may contain any printable character other than a field delimiter, newline, or comment character.
gethostname() in the TCP/IP Programmer's Guide
DNS and BIND by Paul Albitz and Cricket Liu,
O'Reilly & Associates
(ISBN 1-56592-010-4)
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