Configure User Account to Use a Restricted Shell ( rssh )

First install rssh.For more information visit

Create a new user with /usr/bin/rssh

Login as the root user
open the terminal and create a new user called linux
# useradd -m -d /home/linux -s /usr/bin/rssh linux
# passwd linux

Change existing user shell to /usr/bin/rssh

# usermod -s /usr/bin/rssh old-user-name
# usermod -s /usr/bin/rssh war
# chsh -s /usr/bin/rssh war

Try login via ssh or sftp

Now try login via ssh or sftp using username linux:
$ sftp linux@aspx-deskto.com or sftp linux@192.168.1.230

Now you will get the result like this

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

This account is restricted by rssh.
This user is locked out.

If you believe this is in error, please contact your system administrator.

Connection to 192.168.1.230 closed.