Linux OS Shell Question: Download Linux Shell PDF

The statement z = 'expr 5 / 2′ would store which of the following values in z?
a) 0
b) 1
c) 2
d) 2.5
e) 3

c) 2

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To redefine a variable, it can be removed from the list of variables by using the command: a) unset b) delete c) remove d) clear	What is the output of the following program? [ -n $HOME ] echo $? [ -z $HOME ] echo $? a) 0 1 b) 1 0 c) 0 0 d) 1 1