Unit Two Test,  CSCI 423,  Introduction to Operating Systems

 1)Contrast how user-space programs verses the kernel view memory and
  explain how the kernel is able to modify the MMU while users cannot.

 2)Contrast the file types -, d, b, c, l, p, and s.
     
 3)Define "mount." Explain how the mount function is implemented.
   Give three roles of the Unix mount command.

 4)Explain the role of "pid = wait(&status)".
 
 5)Contrast the segments: "code," "data," "heap" and "stack."

 6)Describe the "dup()" service and explain its role.

 7)Explain how the shell employs the dup() and pipe() services to implement
   user-level pipes (the "|" operator).
   
 8)Besides the traditional I/O, list four additional controllers in the
   south side bridge.

 9)Contrast CPU versus memory access latency and give three ways of
   mitigating this difference.

10)Describe the structure of physical memory and the resulting four basic
   memory cell access steps.

Bonus: (Must be completely correct)
   Describe the behavior of the following command and explain exactly how
   the five child shells are able to execute the command:
   cat /etc/passwd | cut -f1 -d: | sort | pr -h Users --columns=5 | more