#!/usr/bin/env bash
# Guard an operation with a confirmation prompt.
main() {
if [ -t 1 ]; then
confirmation_prompt="${1:-"Are you sure you want to continue?"}"
read -r -p "$confirmation_prompt [Y/n] " ans
if [[ "$ans" == "N" || "$ans" == "n" ]]; then
echo "error: aborted!" 2>&1
exit 1
fi
fi
}
main "$@"