At a command prompt, what would the following commands do:

!17 !gli 

In globbing, what do the * amd ? characters designate?

Explain the difference between a background process and the foreground process.

Explain the difference between these two commands

ls & ps & date & ls ; ps ; date 

What does the following command output?

find / -empty | wc -w 

Which of the following lines are recognised by the regexp ^a*b+c{2}?

bbbbcc abbccc aaabbbccc aaabbbcccddd bccbccbccbccbcc