Basic Directory Access - Quiz Explanation

The correct answers are indicated below, along with the text that explains the correct answers.
 
1. What command is used to change a file’s group?
Please select the best answer.
  A. chown
  B. ls
  C. chgrp
  D. su
  The correct answer is C. The chown command changes a file’s ownership. The ls command lists files in the current directory. The su command allows a user to become a superuser. Generally, only the superuser may change file ownership.

2. What does the –R option do?
Please select the best answer.
  A. Allows ownership of an entire directory tree to be changed
  B. Allows ownership of a file to be changed to another group
  C. Allows ownership of a file to be changed to another owner
  D. Allows ownership to be transferred to the superuser
  The correct answer is A. This option is used with the chgrp and chown commands.

3. What command shows the state of permission bits for files and directories?
Please select the best answer.
  A. touch
  B. chown –R
  C. ls –l
  D. chgrp –R
  The correct answer is C. The permission bits are listed as a file type followed by the 9 access permissions bits—read, write, and execute permissions for users, groups, and other.