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Adding PATH



hi,
 
I have successfully installed ns-2.1b5 but it said at the end of the installation to
 
Please put /usr/ns/ns-allinone-2.1b5/bin into your PATH environment
Please put /usr/ns/ns-allinone-2.1b5/otcl-1.0a4 into your LD_LIBRARY_PATH environment
 
I am very new to linux. How do you actually do that for both occassions?
 
Thanks.
Eric