To know the list of Shells that are available on your Linux Operating System, you can take a look at the /etc/shells configuration file.
# cat /etc/shells
/bin/sh
/bin/bash
/usr/bin/sh
/usr/bin/bash
As you can see, I have two shells available, sh and bash.
Let me install zsh,
# yum install -y zsh
...
Installed:
zsh.aarch64 0:5.8.1-1.amzn2.0.1
Complete!
Now if I do cat again of the /etc/shells I should have zsh listed as well.

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