Excersize #1: processes (fork and create) and threads; Assignment #1: write a shell in Java; Excersize #2: virtual memory statistics, coff formats; Assignment #2: write a monitor in Java; Excersize #3: file system excersize on UNIX; Assignment #3: write a process scheduler in Java; Excersize #4: observing network traffic on UNIX; Assignment #4: write a file system in Java;