int $objectIsInside;// on/off switch

float $cylBBox[] = `xform -q -ws -boundingBox pCylinder1`;// cylinder's BBox
float $cubeBBox[] = `xform -q -ws -boundingBox group1`;// group's BBox

if (     ($cylBBox[0] < $cubeBBox[0]) && ($cylBBox[2] > $cubeBBox[2]) ||//check X BBox
            ($cylBBox[3] < $cubeBBox[3]) && ($cylBBox[5] > $cubeBBox[5]) ||//check Y BBox
                ($cylBBox[3] < $cubeBBox[3]) && ($cylBBox[4] > $cubeBBox[4]) ||//check Z BBox
                    ($cylBBox[2] < $cubeBBox[2]) && ($cylBBox[0] > $cubeBBox[0]) ||//check -X BBox
                        ($cylBBox[4] < $cubeBBox[4]) && ($cylBBox[3] > $cubeBBox[3]) ) //check -Z BBox
{
     if (!$objectIsInside){// if not inside set to yes
      $objectIsInside = yes;// check if object is in BBox
    }
} else {
    if ($objectIsInside) // if inside set to no
        print "entered BBox";// print word
    $objectIsInside = no;// check if object is in BBox
}

$boolPrinted = 0;

float $cylBBox[] = `xform -q -ws -boundingBox pCylinder1`;// cylinder's BBox
float $grpBBox[] = `xform -q -ws -boundingBox group1`;// group's BBox

if (     ($cylBBox[0] < $grpBBox[0]) && ($cylBBox[3] > $grpBBox[3]) ||//check X BBox
        ($cylBBox[2] < $grpBBox[2]) && ($cylBBox[5] > $grpBBox[5]) )//check Z BBox
{
    if ($boolPrinted == 0)
    {
print "Object is in";
$boolPrinted = 1;
    }
}
    else
    {
    if ($boolPrinted == 1)
    {
print "Object is out";
$boolPrinted = 0;
    }

}