sets the group ID of the specified files.
The options are as follows:
The force option ignores errors, except for usage errors.
option is specified, symbolic links on the command line are followed.
(Symbolic links encountered in the tree traversal are not followed.)
Change the group ID of the specified symbolic link.
options are mutually exclusive.
option is specified, all symbolic links are followed.
option is specified, no symbolic links are followed.
Change the group ID for the file hierarchies rooted
in the files instead of just the files themselves.
options are ignored unless the
option is specified.
In addition, these options override each other and the
command's actions are determined by the last one specified.
operand can be either a group name from the group database,
or a numeric group ID.
If a group name is also a numeric group ID, the operand is used as a
The user invoking
must belong to the specified group and be the owner of the file,
or be the superuser.
utility exits 0 on success or >0 if an error occurred.