If you are using Linux or Unix Terminal and are not able to determine which shell are you currently active in, you can determine it by simply echoing $0 on the current prompt.
Examples:b2391b608026# echo $0
zsh
root@b2391b608026:/# echo $0
bash
root@b2391b6026:/# echo $0
rbash
# echo $0
dash
# echo $0
sh
If you want to know the list of shells available on your Operating System, just cat /etc/shells
# /etc/shells: valid login shells
/bin/sh
/bin/bash
/usr/bin/bash
/bin/rbash
/usr/bin/rbash
/bin/dash
/usr/bin/dash
/bin/zsh
/usr/bin/zsh
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