Replaces an existing principal with a new principal in all ACEs
 associated with the subtree you specify.

 SYNOPSIS

      CHANGE SUBTREE tree-name[...] ACCESS old-principal

                     new-principal [EXCLUDE entry-type]

 Arguments

 tree-name

 The name of the topmost directory in the subtree. When used without
 the optional recursion notation (...), the change applies only to
 the specified directory and the links and objects in that directory.
 The recursion notation causes the change to additionally apply to
 all child directories and their contents.

 old-principal

 The principal that you want to change. Principals can be
 specified as a group name or an individual name in the format
 nodename.username.

 new-principal

 The new principal. Principals can be specified as a group name or an
 individual name in the format nodename.username.

 entry-type

 One or more of the following arguments to exclude from principal
 modification: objects, links, or directories. Multiple directories
 can be excluded in a single command. Use any combination of the
 following entry-type specifiers, separating multiple arguments with
 commas:

 objects
 links
 directory directory-name

 Description

 This command changes all relevant access control entries (ACEs)
 associated with the directory specified in tree-name and all
 relevant ACEs associated with that directory's contents. You can use
 the optional recursion notation (...) to modify the ACEs associated
 with all the child directories and their contents. You can also
 use the optional exclude argument to restrict the type of entries
 affected by this command.

 ACCESS RIGHTS
 You must have control and write access to the directory you specify
 as well as to the contents of the directory. If you use the command
 recursively, you also need control and write access to all child
 directories (and their contents) of the directory you specify.