When i type the command "rhlibrary", it says tixwish-tk4.1: command not found There was a description of this problem for Red Hat release 5.2 but the solution for that one did not help me with 6.0
This is a know problem and will hopefully be an errata or similar very soon. Until then you can rm /usr/bin/tixwish-tk4.1 ln -s /usr/bin/tixwish4.1.8.0 /usr/bin/tixwish-tk4.1 This will allow you to use the RH LIbrary CD with 6.0.
The procedure described appears to fix the problem.