You need to know which shell you have per default
One way to find out which shell is active is to look at /etc/passwd.
To know which shell is active for the user "lubby" you can run the command:
less /etc/passwd | grep -i "lubby"
Now you can look at the default shell for this user.
You will find entries like:
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.