Unix questions:

1. List some consequences of working on a multi-user system (at least 3).
2. Compare using a graphical user interface with using a command line interface by listing some pro-GUI/pro-command line pairs (at least 3).
3. Say you create a file on the Sun machines called .format. When you enter the command ls, your new file doesn't show up! What is going on? How do you see a listing of this file?
4. Say you receive email from a Sun user complaining that you are running a process that is hogging the machine. Explain the exact process you would go through in response (include the exact commands you would type)
5. Say you log onto a machine, run top and see that you own the top process. You didn't even realize it was running and want to kill it. What do you do?
6. True or False: If the Sun lab is very cold and the AC is running full blast, you should turn it off to save power.
7. True or False: If the door to the Sun lab is propped open, you should close it.

PIFS and fractal image compression/decompression questions:

1. Say that our image is 512x1024 pixels, and the range rectangles are 16x16 pixels. How many range rectangles are there? How many domain rectangles must be compared for each range rectangle? Show your calculations and explain.
2. Say we're doing fractal image compressio/decompression using the method discussed in class. Say that the variables
   double s, o;
   are set to the appropriate values to represent contrast and brightness constants. Say that the variable
   unsigned char domainimage[8][8];
   contains the appropriate scaled-down portion of the original image. Write the 3-5 lines of code that use s and o to adjust the contrast and brightness of domainimage.
3. Our method of saving the PIFS information is very inefficient. Since we are saving the numbers as text, it takes several bytes to store a one-byte integer. If we write to a file in binary, we can save an unsigned char as one byte, an int as 4 bytes, and a double as 4 bytes. If we did this, then how many bytes would our compressed file be if our image had 20 by 16 range regions, and each of which was 8x8 pixels? Show your work, and explain.