Using various methods attempt to find the Fully Qualified Domain Name (FQDN)
of the current host. From this determine the host-name and the host-domain.
Each of the functions will return undef if the FQDN cannot be determined.
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hostfqdn ()
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Identify and return the FQDN of the current host.
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domainname ()
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An alias for hostfqdn ().
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hostname ()
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Returns the smallest part of the FQDN which can be used to identify the host.
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hostdomain ()
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Returns the remainder of the FQDN after the hostname has been removed.
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