Exam LFCS topic 1 question 132 discussion

The correct answer is: A. unset -v FOOBAR; ./myscript Explanation: The unset command is used to remove variables or functions from the environment. unset -v FOOBAR: This removes the variable FOOBAR from the environment before running the script ./myscript. Since environment variables are passed down to child processes (like the script execution), this ensures that FOOBAR will not be visible within the script. The other options are incorrect because: C. env -u FOOBAR ./myscript: This command is used to unset an environment variable within the execution environment of a specific command, but not before it. So FOOBAR would still be visible to the script briefly. B. set -a FOOBAR=""; ./myscript: This command sets FOOBAR to an empty string, but doesn't unset it. D. env -i FOOBAR ./myscript: This command would run the script with a completely empty environment, removing all other environment variables as well.