perl - Passing a variable to a command in a script -

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I am searching everywhere and since I am taking my first step in PERL, it can be one of those But it goes here.

So I am creating a script to manage my windows and later tie it on the keyboard shortcut, so I run an order and try to cross some variables: 

  my $ command = `wmctrl -r: ACTIVE: -e 0,0,0, $ monitor-> {1} - & gt; {'Width'} / 2, $ monitor-> {1} - & gt; {'Height'} `;   
 But I get an error saying that I am not passing the correct parameter in the command, but if I do this, then everything works great:  
  my $ test = $ monitor-> {1} - & gt; {'Width'} / 2; My $ command = `wmctrl -r: active: -e 0,0,0, $ test, $ monitor- & gt; {1} - & gt; {'Height'} `;   
 So do I really have to do this? First, allocate it in one variable and then pass it, or what is another great way to do it?   
 
 
 backtake operator (or  qx {} )  A  String  (possibly) Interpolated ). So the string accepts and  not  
  $ variables  ( $ var-> 1} - & gt; {some}  is also expanded but does not have math expression.  
 So your 2-step version works, but not the first.  
 If you want to evaluate an expression inside the string, then you can use the next:  
  my $ ans = 42; print "@ {[$ ans / 2]} Reply Only half of \ n ";   
 Print  
  21 is only half of the answer   
 But it is not very readable, it is better and elegant that you are already doing - And similarly calculate the command argument, and pass  qx {}  or backattics to  $ variables .

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