Challenges:

This is your directory tree for the first two exercises:

If pwd displays /users/thing, what will ls ../backup display?

1. ../backup: No such file or directory
2. 2012-12-01 2013-01-08 2013-01-27
3. 2012-12-01/ 2013-01-08/ 2013-01-27/
4. original pnas_final pnas_sub

If pwd displays /users/backup, and -r tells ls to display things in reverse order, which command(s) will display: pnas-sub/ pnas-final/ original/

1. ls pwd
2. ls -r -F
3. ls -r -F /users/backup
4. Either #2 or #3 above, but not #1.

What does the command cd without a directory name do?

1. It has no effect.
2. It changes the working directory to /.
3. It changes the working directory to the user's home directory.
4. It produces an error message.

What does the command ls do when used with the -s and -h arguments?