root@vipul-linux:/home/vipul/Desktop# ns helloworld.tcl

    (_o5 cmd line 1)
    invoked from within
"_o5 cmd at 1 “puts “Hello World””"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o5" line 2)
    (SplitObject unknown line 2)
    invoked from within
"_o5 at 1 “puts “Hello World””"
    ("eval" body line 1)
    invoked from within
"eval $scheduler_ at $args"
    (procedure "_o3" line 3)
    (Simulator at line 3)
    invoked from within
"$ns  at  1  “puts  \“Hello World\””"
    (file "helloworld.tcl" line 2)