Bash shell

[ehtshamirshad]

I have entered the command cp /bin/bash /rbash  to restrist user to its home dir only. but now  i  want  user to login to bash shell again. i applied the command cp /bin/rbash  /bin/bash.
but the command didnt work and now any of user cannot login. only root can login to linux. i want to reverse the command. plz kindly tell me. thnks