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    Question

    In a POSIX shell script, which construct correctly tests

    whether variable x is an empty string?
    A if [ $x -eq "" ] Correct Answer Incorrect Answer
    B if [ -z "$x" ] Correct Answer Incorrect Answer
    C if (($x == "")) Correct Answer Incorrect Answer
    D if test -n $x Correct Answer Incorrect Answer
    E if expr $x = "" Correct Answer Incorrect Answer

    Solution

     -z returns true if string length is zero; quoting $x avoids word-splitting when empty.

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