How to get current shell name (e.g. bash/zsh) on Linux

To get just the name of the shell, e.g. bash or zsh, use

echo $SHELL | rev | cut -d/ -f1 | rev

Example:

$ echo $SHELL | rev | cut -d/ -f1 | rev
bash

To get the full path of the current shell executable, use

echo $SHELL

Example:

$ echo $SHELL
/bin/zsh

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