cp -p "$from2dir"/sub1/uno "$from3dir"/sub1/dos "$from2dir"/sub1/tres "$chkdir"/sub1
cp -p "$from3dir"/sub2/subby "$chkdir"/sub2
# Get rid of any directory-time differences
touch "$from1dir" "$from2dir" "$from3dir" \
cp -p "$from2dir"/sub1/uno "$from3dir"/sub1/dos "$from2dir"/sub1/tres "$chkdir"/sub1
cp -p "$from3dir"/sub2/subby "$chkdir"/sub2
# Get rid of any directory-time differences
touch "$from1dir" "$from2dir" "$from3dir" \