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Mac OS X 10.1 (and earlier versions of Mac OS X) only consulted /etc/hosts in single-user mode and stored hostname/IP address mappings in the /machines portion of the NetInfo database. As of Mac OS X 10.2, you can use the /etc/hosts file to map hostnames to IP addresses. For example, the following entry would map the hostname xyzzy to 192.168.0.1:
192.168.0.1 xyzzy
If you are using Mac OS X 10.1.5 (or an earlier version of Mac OS X), you'll need to use NetInfo to maintain the hosts database. The niload utility understands the flat file format used by /etc/hosts (ip_address:name). See the hosts(5) manpage for a description of each field. To add a new host, create a file using that format and load it with niload. This example uses a here document instead of a separate file to add the host xyzzy:
# niload hosts . <<EOF ? 192.168.0.1 xyzzy ? EOF
If you add an entry that already exists, it will not be changed or overwritten. Instead, niload will silently ignore your command. (To override this behavior, see the -m option under "niload" in Section 3.6, earlier in this chapter.)
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| 3.8. Managing Users and Passwords |  | 3.10. Exporting Directories with NFS |
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