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I found the following instructions on http://www.sonoracomm.com/support/19-inet-support/232-ddclient
tar -xzvf ddclient.tar.gz
cp ddclient /usr/local/bin
cp sample-etc_rc.d_init.d_ddclient /etc/rc.d/init.d/ddclient
chkconfig --add ddclient
rm -rf ddclient-3.7.3/
on the second cp command there is only on file. Shouldn't there be a destination also?
I think you should post your question on the site where you find the instructions.
I would have posted it there if I had found a forum there, but I didn't see one. Anyway, one of the guys got it installed so I withdraw the question.