in the manual it says polysmooth can be applied to faces or objects, how can I apply it simply to the object?

something like
$obj = `ls -sl`;
polySmooth -dv 2 plg2.f[0:5];

should be possible or
setAttr "polySmoothFace1.divisions" $sdiv;
without the Face1:
setAttr "polySmooth.divisions" $sdiv;

but doesn't work. any tips appreciated.