It sounds you might be in another type of shell. From the terminal submit
If that fixes it you can change the default shell to bash. Run the following command to get the location of the bash binary:
Once you have that (something like /bin/bash or /usr/local/bash) then you use that for the next command which changes the default login shell:
You will need to enter the password for the user that you want to change the login shell for. Log out and back in again to check that is sorted.
:~$ chsh -s /bin/bash <user>