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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.
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