p9idf

11 ms·

91.
by p9idf 15y ago
As far as I know, the kernel programs the MMU so that dereferencing 0 will always fault. I could be wrong, as my understanding of the kernel is limited. I am not sure of the purpose of the loop, but to me it make it unavoidably obvious that
92.
by p9idf 15y ago
Plan 9's abort causes an access fault, causing the current process to enter the `Broken' state. The process can then be inspected by a debugger. Pretty elegant. http://plan9.bell-labs.com/sources/plan9/sys/src/libc/9sys/a...
93.
by p9idf 15y ago
Those features simply do not belong in a program whose purpose is to concatenate its input. If you want to number a file's lines, 'echo ,n | ed file | sed 1d' or 'awk ''{ print NR " " $0 }''' will do just fine. You could even wrap your ed o
94.
by p9idf 15y ago
The Unix Programming Environment has a discussion of vis on page 172. It notes that you can use 'sed -n l' to do the same thing.
95.
by p9idf 15y ago
Stdio would add unnecessary overhead. And why bother with stdio (or its Plan 9 equivalent) when it's so easy to do the buffering faster yourself?
96.
by p9idf 15y ago
Bash's implementation[1] isn't especially fast. It gets its speed by not having to fork, which is expensive on systems with dynamic linking. [1] http://git.savannah.gnu.org/cgit/bash.git/plain/builtins/ech... http://git.savannah.gnu.org/
97.
by p9idf 15y ago
cat.c is also interesting. The GNU version is an appalling unreadable mess. V6's assembly implementation in easier to understand. V6: http://www.bsdlover.cn/study/UnixTree/V6/usr/source/s1/cat.s... V7: http://www.bsdlover.cn/study/UnixTr
98.
by p9idf 15y ago
I would design for both of your made up demographics. And in both cases I would preserve the page metaphor by not using frames.
99.
by p9idf 15y ago
This is the gist of it. http://img13.imageshack.us/img13/4007/screenwaste2.png
100.
by p9idf 15y ago
I despise frames. And let's call these fixed elements what they really are: frames. In addition to reducing the usable screen area (which is awful on my netbook's 1024x600 screen)[1], frames also break the page metaphor. Part of what makes
101.
by p9idf 15y ago
The main feature that Rc has which Bash lacks is simplicity. Bash's man page is twice the size of Rc's entire source code.
102.
by p9idf 15y ago
Xv6* is a good place to start studying the workings of a Unix-like operating system. * http://pdos.csail.mit.edu/6.828/xv6/
103.
by p9idf 15y ago
Erik Quanstrom has a version which fixes some of Rc's faults, like having no return statement and the weird ifs behaviour.
104.
by p9idf 15y ago
If you can't see the point of operating systems research, how else would you like to see the state of the art advanced?
105.
by p9idf 15y ago
Sape Mullender and Noah Evans from Bell Labs announced last year that they are working on a system called Osprey. There's video of the talk floating around somewhere.
106.
by p9idf 15y ago
Hurd isn't stuck in the seventies and aims to do more than re-implement a 40-year-old design.