These security enhancements are new in the Solaris Express 5/06 release.
In this release, the following new options have been added to the useradd -D utility:
-s option. Enables the user to change the default shell.
-k option. Enables the user to change the default skel directory.
-b option. Enables the user to change the base directory.
For more information, see the useradd(1M) man page.