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[[ $- == *i* ]] && echo "Interactive shell" || echo "Non-interactive shell"
Interactive shell

bash -c ' [[ $- == *i* ]] && echo "Interactive shell" || echo "Non-interactive shell" '
Non-interactive shell

zsh -c ' [[ $- == *i* ]] && echo "Interactive shell" || echo "Non-interactive shell" '
Non-interactive shell

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