How can the existing environment variable FOOBAR be suppressed for the execution of the script.

 The env command can be used to run a utility or command in a custom environment without having to modify the currently existing environment1. The -u or --unset option can be used to remove a variable from the environment12. Therefore, the command env -u FOOBAR./myscript will run the script./myscript in an environment where the variable FOOBAR is suppressed. The other options are incorrect for the following reasons:

A. unset -v FOOBAR;./myscript: This will unset the variable FOOBAR in the current shell, not just for the script execution. The semicolon (;) separates two commands, so the script will run in the same environment as the unset command.

B. set -a FOOBAR=“”;./myscript: This will set the variable FOOBAR to an empty string, not suppress it. The -a option means that the variable will be exported to the environment of subsequent commands, so the script will still see the variable FOOBAR, but with no value.

D. env -i FOOBAR./myscript: This will run the script in an empty environment, not just suppress the variable FOOBAR. The -i or --ignore-environment option means that no environment variables will be passed to the command12. References: env command in Linux with Examples - GeeksforGeeks, env - Wikipedia.