Changing owner of folders contents

[Aussie John]

I Have followed advice in these forums regarding changing ownership of files and folders using chown.
This doesn't appear to change ownership of the contents and subfolders.
What else do i need other than

"sudo chown user:group filename"

I am logged as admin

thanks

Also chown of a file appears to be instantaneous but changing owner of a folder need to re login to take effect (in the info box at least)

 

[Aussie John]

Thanks testuser
on a slightly different tack what do the other flags represent?

 

[Aussie John]

excellent- thanks