mkdir "$from1dir" "$from2dir" "$from3dir"
mkdir "$from2dir"/sub1 "$from3dir"/sub1
-mkdir "$from3dir"/sub2
+mkdir "$from3dir"/sub2 "$from1dir"/dir-and-not-dir
mkdir "$chkdir" "$chkdir"/sub1 "$chkdir"/sub2
echo "one" >"$from1dir"/one
cp -p "$from1dir"/one "$from2dir"/one
echo "sub2" >"$from3dir"/sub1/dos
echo "sub3" >"$from2dir"/sub1/tres
echo "subby" >"$from3dir"/sub2/subby
+echo "not-dir" >"$from3dir"/dir-and-not-dir
cp -p "$from1dir"/one "$from1dir"/two "$from2dir"/three "$from3dir"/four "$from1dir"/five "$from3dir"/six "$chkdir"
+cp -p "$from3dir"/dir-and-not-dir "$chkdir"
cp -p "$from2dir"/sub1/uno "$from3dir"/sub1/dos "$from2dir"/sub1/tres "$chkdir"/sub1
cp -p "$from3dir"/sub2/subby "$chkdir"/sub2