Introduction - If you have any usage issues, please Google them yourself
Note: the following diagram, the command line directly into the path of the four lines should not be saved to a file. export NS_HOME = `pwd`/ns-allinone-2.28export PATH = $ NS_HOME/tcl8.4.5/unix: $ NS_HOME/tk8.4.5/unix: $ NS_HOME/bin: $ PATHexport LD_LIBRARY_PATH = $ NS_HOME/tcl8.4.5/unix : $ NS_HOME/tk8.4.5/unix: $ NS_HOME/otcl-1.9: $ NS_HOME/lib: $ LD_LIBRARY_PATHexport TCL_LIBRARY = $ NS_HOME/tcl8.4.5/library