[ns] problem of executing .tcl file

[Chih-Fan Hsin <chsin@engin.umich.edu>]

When I want to run a tcl script, I need to put it in the same directory as
the executable "ns" file.
If I do not put the tcl script in the same directory as the executable
"ns" file, a error message
"e.tcl does not exist, try again"
will show up when I execute
"ns e.tcl" in e.tcl directory.
I already put the path to the executable "ns" file in the $PATH.
Can anyone tell me what's wrong?

Thanks,
Charles