Linux OS Shell Question: Download Linux Shell PDF

How do you print the lines between 5 and 10, both inclusive?
a) cat filename | head | tail -6
b) cat filename | head | tail -5
c) cat filename | tail +5 | head
d) cat filename | tail -5 | head -10

a) cat filename | head | tail -6

Previous Question	Next Question
Which of these is not a valid variable in bash: a) __ (double underscore) b) _1var (underscore 1 var ) c) _var_ (underscore var underscore) d) some-var (some hyphen var)	What would be the current working directory at the end of the following command sequence? $ pwd /home/user1/proj $ cd src $ cd generic $ cd . $ pwd a) /home/user1/proj b) /home/user1/proj/src c) /home/user1 d) /home/user1/proj/src/generic