COMP 3000 Test 1 Study Guide 2011: Difference between revisions
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# In UNIX, there are three permissions associated with the user, the user's group, and everyone else. What are those three permissions? | # In UNIX, there are three permissions associated with the user, the user's group, and everyone else. What are those three permissions? | ||
# I can copy a file using I/O redirection as follows: <tt>cat /bin/ls > bar</tt>. If I now type ./bar, will | # I can copy a file using I/O redirection as follows: <tt>cat /bin/ls > bar</tt>. If I now type ./bar, it won't run. However, if I first run another command, ./bar will give me a file listing. What command should I run? | ||
Revision as of 21:00, 3 October 2011
Key Concepts
For this test, you should understand the following terms and how they interrelate at a high level:
- processes: fork, zombie processes
- the UNIX shell (e.g., csh or bash)
- basic UNIX file permissions
- UNIX standard input & output, I/O redirection
- kernel & supervisor mode
- hypervisor and hypervisor mode
- paravirtualization and hardware virtualization
- /proc and basic output of ps
- UNIX Environment variables
- UNIX dynamic libraries versus system calls
- static versus dynamic linking
- output of ldd versus /proc/<PID>/maps
- VM guest additions
- virtualization versus emulation
Sample Questions
- If you see a zombie process during normal system operation, how can you get rid of it?
- Hypervisors multiplex computer hardware between what kind of programs?
- What CPU mode does the kernel run in?
- If a CPU does not support hardware virtualization, can you still run a hypervisor?
- Under hardware virtualization, when an interrupt happens, which runs first - a hypervisor or a kernel?
- A hypervisor provides what sort of interface to programs that run on it?
- Files and sockets
- Disks and ethernet
- ???
- In UNIX, there are three permissions associated with the user, the user's group, and everyone else. What are those three permissions?
- I can copy a file using I/O redirection as follows: cat /bin/ls > bar. If I now type ./bar, it won't run. However, if I first run another command, ./bar will give me a file listing. What command should I run?