Which one of these lines will check if the directory 'foo' exists and create it if it doesn't?

Which command will tell you how long a system has been up and running since it was last booted?

What does the command 'set $(date)' do?

The cksum command will read from standard input if:

The ____ command will display LVM volume groups.

mklost+found:

Which of the following options of ln will allow you to create a symbolic link?

How do you update the last accessed time of a file?

What does the command 'du -hcs *' do?

What does the command 'tar zxf latest.tgz' do?

You want to show every line (with the file name and the line number) in the log files of a Ubuntu system that does NOT contain the string 'info' (case insensitive). What is the proper command?