Change the ownership of one or more
newgroup is either a group ID number or a group name located in
/etc/group. You must own the file or be a privileged user
to succeed with this command.
Change the group on symbolic links. Normally, chgrp acts on the
referenced by a symbolic link, not on the link itself.
Recursively descend through the directory, including subdirectories and symbolic links, setting the specified group ID as it proceeds.