How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?
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A. B. C. D.C
The correct answer is C. env -u FOOBAR ./myscript.
Explanation: Environment variables are variables that are used to store information that can be accessed by various programs or scripts running on the same system. These variables can be set, modified or removed using various commands.
The command unset is used to remove the value of an environment variable. The set command is used to set or modify the value of an environment variable.
Option A unset -v FOOBAR;./myscript: This command will unset the value of the FOOBAR environment variable and then execute the script. However, this will also affect any subsequent commands or scripts that are executed in the same terminal session.
Option B set -a FOOBAR="";./myscript: This command will set the value of the FOOBAR environment variable to an empty string and then execute the script. However, this will also affect any subsequent commands or scripts that are executed in the same terminal session.
Option C env -u FOOBAR ./myscript: This command will run the script with the FOOBAR environment variable unset. This means that the script will not have access to the value of the FOOBAR environment variable, but other commands or scripts executed in the same terminal session will still have access to the value of the variable.
Option D env -i FOOBAR ./myscript: This command will run the script with an empty environment, which means that none of the environment variables set in the current terminal session will be available to the script.
Therefore, the correct option to suppress the existing environment variable FOOBAR for the execution of the script ./myscript only is C, env -u FOOBAR ./myscript.