Of course it is. What does your scipt do? It assigns the number 5 into $show and
then exits. So, like you posted it it has no usage.

But what exactly is your point?
The $orphan-thing is only meant to be an indicator for that a variable may be
obsolete. I will of course check for that before i delete it.
Apart from that, the script shows me e.g. when i'm about to remove a section of
the script, if the variables in that section are used anywhere else in the
script.
And its a lot faster and better than to search for every variable manually.
For example, one of the scripts i currently clean up has 263 variables and for
that its a great help.