Linux - Environment variables

Please answer the quiz and click the "Test" button at the bottom right.

Question 1

When a user runs the command who from the command line, which of the following best describes what happens?

The shell asks the kernel to execute the contents of the file /usr/bin/who as a separate process, displaying the process's output on the terminal.
The shell makes the who system call, prompting the Linux kernel for the output directly.
The shell exits, and is replaced by the who process. When the who process terminates, it replaces itself with a new shell process.
None of the above.

Which of the following could not be used as the name of an environment variable?

Which of the following would correctly set the environment variable ADDR to “123 Elm St.”?

Which of the following is not a feature of environment variables?

All processes use environment variables, not just those running the bash shell.
Environment variables are inherited by child processes by default.
Upon startup, the bash shell clears all previously defined environment variables.
Environment variables can be examined using files found in the /proc filesystem.

Which of the following commands would append the directory /opt/bin to the current value of the PATH environment variable?

The user elvis performs the following command.

[elvis@station elvis]$ export STYLE=terse

Which of the following commands would delete the environment variable STYLE?