[ns] bash: namtrace-all: command not found

[vava vvava]

I have install ns-allinone-2.30 
so the next step i learn using NS from Marc Greis' Tutorial.
The following are the command for starting ns in Marc Greis' Tutorial.

set ns [new Simulator]
set nf [open out.nam w]
$ns namtrace-all $nf



The first 2 command is doing fine.
But for the last commmand, i got this error:

bash: namtrace-all: command not found

Is it related to enviroment variable path?
I did put my enviroment variable path before I run my validation.
Moreover, my validation for ns is doing fine.






 
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