reading the output file and trace file in ns2

set traceFD	[open "test.tr" w]

$ns_ trace-all $traceFD



set namFD    [open "test.nam" w]

$ns_ namtrace-all-wireless $namFD $val(x) $val(y)



…..

……



close traceFD

close namFD

exec nam  test.nam

In the above code segment,

*The first line declares and opens file ‘test.tr” in write mode by using a file descriptor ‘tracefd’
*The second line will record all the trace events in that file using that file descriptor

*The third line declares and opens a file ‘test.nam” in write mode by using a file descriptor ‘namFD’
*The fourth line will record all the nam events in that file using that file descriptor

*The last three lines will close those files using those file descriptors and display the nam file.

Trace analysis will be made on the file “test.tr” for extracting information and that information will be used to display graphs using xgraph /gnuplot or any other tool.

Trace analysis can be done using any scripting language (any unix shell, tcl,perl,python,awk etc.,) or programming language(c, c++ java etc.,) of choice.
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