Indentify Active Shell
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
zshroot@b2391b608026:/# echo $0
bashroot@b2391b6026:/# echo $0
rbash# echo $0
dash# echo $0
shIf 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
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