my $x10_device = .$event->house_code().$event->unit_code().$event->func().;
I don't think this is your real code. As it is, it produces nothing but a syntax error.
Do you maybe have double quotes around the right hand side of the assignment, i.e.
".$event->house_code().$event->unit_code().$event->func()."
That would produce the string you're seeing, because the $event
object would be interpolated/stringified instead of having its methods called...
This has nothing to do with system() or bash. Just get rid of the superfluous dots:
my $x10_device = $event->house_code().$event->unit_code().$event->func
+();
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