21. The agency that sits between the user and the UNIX system is called the
A. logic
B. profile
C. shell
D. erxc
E. None of the above
22. Which of the following commands is used to update access and modification times of a file?
A. grep
B. wc
C. touch
D. cat
E. None of the above
23. Which command is used to count just the number of characters in a file?
A. wc – 1
B. wc -c
C. wc -w
D. wc -r
E. None of the above
24. Which of the following commands is used to list contents of directories?
A. ls
B. lp
C. dir
D. tar
E. None of the above
25. Which command is used to display a file contents in octal form?
A. cd
B. od
C. of
D. oct
E. None of the above