This message shows the syntax for the hostname, domainname, and dnsdomainname commands. It is displayed when incorrect parameters were specified or when the -h or -? options were specified.

-s

This option, only valid for the hostname command, specifies that host name should omit the DNS domain name and print only the host-specific portion.

-c

This option, the default, specifies that the host name should be retrieved from the resolver configuration file.

-g

This option specifies that the host name should be retrieved using the gethostname() system call.

-r

This option specifies that the host name should be retrieved from the DNS server, with the query based on the results of the gethostname() system call.

-p stackname

Use the specified AF_INET stack.

-d

This option specifies that debugging messages should be displayed. This might be useful for problem diagnosis.

-h or -?

These options request that this message be displayed.