chgrp group file ...

• Change the group of "folder1" to "group1".
  

  $ chgrp group1 folder1/

• Change the group of "folder1" (and its files and sub-directories) to "DOMAIN\group2".
  Use the escape character "\" to escape the character "\".
  You can also use the double quote character """ to delimit the folder path to escape the character "\".
  

  $ chgrp -R DOMAIN\\group2 folder1/
  
  $ chgrp -R "DOMAIN\group2" folder1/

-R
|If chgrp is applied to a directory, it will change the group of this directory and all its files and sub-directories.
|By default, symbolic links will be changed.
|But the linked files of symbolic links will not be changed.

-L
|If the -R option is specified, symbolic links will not be changed.
|But the linked files of symbolic links will be changed.
|The -L option overrides any previous -P options.
|The -L option is ignored unless the -R option is specified.

-P
|If the -R option is specified, symbolic links will be changed.
|But the linked files of symbolic links will not be changed.
|The -P option overrides any previous -L options.
|The -P option is ignored unless the -R option is specified.

-v
|Cause chgrp to be verbose, showing filenames if the group is modified.