How to Get the Fully Qualified Domain Name in Unix
On any system of computer networks based on the Internet protocol, a single computer is uniquely identified by a fully qualified domain name (FQDN). An FQDN contains two parts: a host name followed by (and separated by a period from) an absolute domain name. The host name is a locally unique, locally assigned name for a computer (e.g., there can be a single "mail090" host within domain "yahoo.com"). The absolute domain name gives all the information needed to locate the host, ending at a top-level domain such as ".com." You can get the current FQDN on a computer running any version of the Unix operating system.
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Instructions
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Log in to the Unix computer in text mode. The computer brings up a command-line interface called the shell.
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Verify that the computer is connected to a network by entering this command into the shell:
ping com.com
Replace "com.com" by the FQDN of any host that should be reachable from your computer. Press "Enter." If the output consists of a series of lines beginning with "64 bytes" and ending with time measurements in milliseconds, your computer is connected. Press "Control-C" to stop "ping."
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Get the FQDN by entering the following command into the shell:
hostname --fqdn
Press "Enter." The output of the "hostname" command is the FQDN.
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Comments
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Do not do this on a Solaris system. "hostname --fqdn" will change your hostname to "--fqdn" (if you execute this as a root user). This seems to be a Linux command, not Unix. The Solaris version of the hostname command doesn't have any options. Not sure about other Unixes.
