Which command moves up one directory level?

• A. Cd
• B. Cd .
• C. Pwd
• D. Cd ..

Answer: (D)

Understanding directory navigation: two dots designate the parent directory, and cd is the command to change your current directory. When you run the command with two dots after cd, you’re telling the system to switch to the directory that contains your current one, effectively moving up one level. So, cd .. moves you up to the parent directory.

The other options don’t move up a level: cd . refers to the current directory (no change); pwd displays the current path rather than changing directories; and cd with no argument typically takes you to your home directory in many shells. Keep in mind that commands are case sensitive in most environments, so Cd with a capital C might not work where cd is expected.