Trying to run ns over examples given in 
the following error appears

$ ./ns ./ns-tutorial/examples/example1b.tcl
ns: finish: couldn't execute "nam": permission denied
    while executing
"exec nam out.nam &"
    (procedure "finish" line 7)
    invoked from within

Before launching the example I did the following steps

1) Installed ns-2.29 without errors but in xgraph (couldn't install it)
2) set environment variables and appropriate PATH

did I forgot some steps? some hints?


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