Binary Numbers

Integer and Real Numbers

Shell

Processes

• fork

  pid = os.fork()
  if pid == 0:
    print ("\tHi! I'm the child process.")
    print ("\tsleeping for 5 seconds....")
    time.sleep(5)
    print ("\t... exit with status 99.")
    sys.exit(99)
  elif pid == -1:
    print ("yikes! fork failed!")
    sys.exit(1)
  else:
    print ("I'm the parent process")
    print ("waiting for child with PID", pid)
    wval = os.wait()
    print ("wait over! process ID was ")
    print (wval[0], "exit status",wval[1]>>8)
  

  File Systems

Memory Management

Scheduling Processes

Boot Sequence

• power on -> BIOS running -> MBR loaded -> GRUB loaded -> kernel loaded -> init started -> system processes running -> system operating normally

Virtual Machines

Containers

Networks

Domain Name System

Application Layer

Computer and Network Security

Cloud Computing