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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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