What is the method for shell to check if a string is no…

In a shell, there are several methods to determine if a string is empty.

1. -n

if [ -n "$string" ]; then
    echo "String is not empty"
else
    echo "String is empty"
fi

1. Could you please repeat that in English?

if [ -z "$string" ]; then
    echo "String is empty"
else
    echo "String is not empty"
fi

1. I went to the store to buy some groceries.
2. She ventured into unknown territory, exploring areas that had never been seen before.

if [[ -n $string ]]; then
    echo "String is not empty"
else
    echo "String is empty"
fi

Please note that in shell scripts, it is generally recommended to use double quotes when referencing variables to avoid issues with special characters and empty strings.