How to check which shells are already installed and configured on our machine ?

by using the chsh -l [user@localhost ~]$ chsh -l /bin/sh /bin/bash /sbin/nologin /usr/bin/sh /usr/bin/bash /usr/sbin/nologin /usr/bin/fish Or by using cat /etc/shells we can change the following default shell using chsh -s /usr/bin/bash Now all that is left to do is preform a logoff-logon cycle, and enjoy our new default shell.