Change the group of one or more files to newgroup. newgroup is either a group ID number or a group name located in /etc/group. Only the owner of a file or a privileged user may change the group.
Print information about files that are changed.
Change the group of the file pointed to by a symbolic link, not the group of the symbolic link. This is the default behavior.
Do not print error messages about files that cannot be changed.
Change the group of the symbolic link.
Used with -R. If a command-line argument is a symbolic link to a directory, traverse the directory.
Print help message and then exit.
Used with -R. Traverse every symbolic link that points to a directory.
Do not treat / as special. This is the default behavior.
Used with -R. Do not traverse any symbolic links. This is the default behavior.
Do not operate recursively on /.
Traverse subdirectories recursively, applying changes.
Change the group to that associated with filename. In this case, newgroup is not specified.
Verbosely describe ownership changes.
Print version information and then exit.