System administrators can use restricted versions of the Korn shell (rksh) and Bourne shell (rsh) to limit the operations allowed for a particular user account.
Restricted shells do not allow the following operations:
Changing directories
Setting the $PATH variable
Specifying path or command names beginning with "/"
Redirecting output
See the ksh and sh man pages for a description of these shells.
Note that the restricted shell and the remote shell have the same command name (rsh) with different path names:
/usr/lib/rsh is the restricted shell
/usr/bin/rsh is the remote shell