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The book The Design of the Unix Operating System speaks of a clock or timer that is used in scheduling. The clock generates interrupts that update priority information for processes and preempt...

Okay, so there are many hosts for the domain youtube.com. I understand somewhat better now. How does DNS figure out which host to use after it narrows down the domain?

I've always been confused by technical discussions of DNS. They say that DNS is used to match a domain name with the IP address of a host on the Internet. The thing that confuses me is this premise...

Okay, so hostname sets the hostname temporarily. I understand now.

So you can't just change the name of a Mac OS X computer with the hostname command? Like is there a difference between that and doing it from the System Preferences?

I noticed my hostname is <my-full-name>s-macbook.local. I'm not sure exactly what information leaves the local network, and whether the hostname is included, but if it is, this would mean people on...

Well, it seems no one knows. Can anyone suggest a community where someone would know?

gnus doesn't seem to work for me. I tried giving it a couple different servers in the GNUs config file, including textnews.news.cambrium.nl and news.gnus.org. The first one I've used before,...

Thank you. That works.

I just started playing around with Unix's OpenSSL utility. I can't seem to get the hang of it, and the man page isn't helping much. I wanted to experiment with file encryption, so I created a dummy...

I just learned how to turn filesystem journaling on and off using the diskutil command. I'm thinking I probably don't need it on. I mean, journaling is mostly useful if you have mission-critical...

But I'm on a switched network, so the network switch will filter out packets not destined for my computer and I will not receive them. I can understand why I would be getting those packets if the...

I've recently started learning to use TCPdump, and I find it pretty interesting. There's one thing I don't understand. When I tell it to capture packets on, say, the WiFi interface en1, it often...

So does Unix do any preemption with fork(), or is it just round-robin scheduling with timer interrupts?

Okay. I copied all the C header files into /usr/include a while back while I was trying to get it to work. Should I delete them before I download the developer tools?

I'm not sure I know what you're talking about. I already have gcc, make, etc. installed on my machine, and have added their directory to $PATH in my startup script. However, when I run gcc, it...

I never understood what exactly it is that preempts a process in a preemptive multitasking system. For example, round-robin, SRTF, or preemptive priority-based algorithms. I understand how the...

I am using Mac OS X 10.8.


nslookup
> google.com
Server: 75.75.75.75
Address: 75.75.75.75#53

Non-authoritative answer:
Name: google.com
Address: 216.58.219.206



route get...

I'm having some trouble understanding the output of the route command. Specifically, the "route to" and "destination" fields. I'm guessing "route to: <address>" means when the queried host receives...

As you may already know, Apple has integrated all the GNU developer tools into their own graphical development environment so you can no longer use them from the command line. This means that open...

I wrote a simple program to have cat pipe its output into less through a FIFO. The write works fine, but the child won't exit after writing to the FIFO. Another program needs to read from the FIFO...

Okay, that makes sense now. Thanks for clearing that up.

Except I've noticed that the bash shell can detect the arrow keys (e.g. to move through history) without the user having to press enter, even though it shows ICANON turned on when I run stty. How...

I'm writing a command shell, and I want to be able to detect when the user presses an arrow key (otherwise it just prints [[A, [[B, etc.). I know it's relatively easy (although somewhat more...

I changed TIOCSWINSZ to TIOCGWINSZ. When you use an S, it sets the terminal dimensions, and when you use a G, it gets the dimensions.

My problem was that I set the terminal dimensions to fields...