Given the following directory structure, answer questions 15-20 bin etc home usr foxr dukeg marst zappaf temp temp2 15. If you are currently in the directory marst, write a relative path to dukeg. 16. If you are currently in the directory b, write an absolute path to etc. 17. If you are currently in the directory a, where does .take you? Assume for questions 18-21 that you have proper permission to accomplish the t 18. Write a command to rename the file in /home/foxr called foo.txt to for.txt 19. Write a command to move all files in /home/foxr/temp to /home/foxr/ten