Re: [Haifux] kmail "sender-images"

2015-10-26 Thread Oron Peled
On Monday 26 October 2015 21:00:53 Diego Iastrubni wrote:
> And no, he is not on my KAddressBook (just checked). This debian laptop is 
> not 
> ..."conntected" too google services. So I still wonder.
>
> You are also not on my contact list, which is another issue, and you can beat 
> me with a stick to death out of the mailing list. 
> 

OK, besides kaddressbook, I found another "sender-image" source:
  * Gravatar (Settings -> Configure kmail -> Appearance -> Message Window -> 
Enable Gravatar Support)

Maybe there are other sources?

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then they fight you, 
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Re: [Haifux] Fwd: compiler/tools/architecture conference

2015-10-19 Thread Oron Peled
/On Sunday 18 October 2015 23:31:56 Diego Iastrubni wrote:/
/> Muli,/
/> /
/> How did you set up your image in color...?/

Diego, if you refer to the "sender-picture", than Kmail simply match the sender 
with your addressbook.
That's why you see one picture, I may see another and Muli doesn't know what 
you are talking about ;-)

/> I think this is the corresponding code, but I don't think I know how to 
configure this in KMail :)/
/> X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;/

Nope, that's related to DKIM signature used to help some spam-filters.

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Re: [Haifux] Fwd: compiler/tools/architecture conference

2015-10-19 Thread Oron Peled
[Muly, sorry for hijacking your thread, but it's becoming interesting...]

On Monday 19 October 2015 10:39:00 Baruch Siach wrote:
> On Mon, Oct 19, 2015 at 10:21:43AM +0300, Oron Peled wrote:
> > /On Sunday 18 October 2015 23:31:56 Diego Iastrubni wrote:/
> > /> Muli,/
> > /> /
> > /> How did you set up your image in color...?/
> 
> Speaking of email clients I must say that the quoting style in the plain-text 
> version of your email is quite strange. A '/' character appears at the start 
> and end of each quoted line. Should I interpret this as italic style?

Sending HTML mail to this list was an accident, but you found something 
interesting.

Here are the details:
 * Sometime I communicate with corporate users and in the beginning I used
   the same text/plain format as always.

 * However, unlike modern mail clients, their mail clients display quoted
   and unquoted text exactly the same (yes, Outlook. I'm looking at you).

 * The result is that it's very hard for them to read a mix of
   quoted/unquoted text. Which explains why top-posting is so common
   among users of that legacy mail client :-(

 * As a workaround, I started sending them HTML mail and apply a different
   visual style to the quoted text before mixing my reply text.
   The style I used was: green text (as in kmail), small font and ITALICS.
   This way they get a reasonable rendering of the intermixed text.

 * As Baruch just observed, in the text/plain version, kmail convert the italics
   to: /text-text-text/

Conclusions:
 * Re-check non-HTML mail before sending (IIRC, kmail used to have non-HTML/HTML
   settings per-corespondent or per-folder -- but maybe I'm wrong).

 * When replying to corporate users, don't mark the quoted text with italics,
   only with color+size, so the visual rendering of text/plain would be more
   consistent with text/html.

Thanks for the heads-up,

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Re: [Haifux] [JOB OFFER] VB Developer needed in Univ. of Haifa

2013-07-08 Thread Oron Peled
On Monday 08 July 2013 15:42:43 Orr Dunkelman wrote:
 The department of political science at university of Haifa is looking for a
 VB developer (yes, not really FOSS-related, but it's in Haifa) for an
 interesting project.

VB as in Virtually-Broken -- no?

[couldn't resist]

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[Haifux] שתי הצעות עבודה: מפתח לינוקס ואיש תמיכה לינוקס

2013-05-20 Thread Oron Peled
שלום,

אלו הצעות עבודה מטעם מישהו שאינו רשום לרשימת התפוצה.
אנא, השיבו לכתובת j...@yaad.org.il ולא אלי.

---גזור-ושמור--גזור-ושמור

חברה בגליל מחפשת אנשי לינוקס ואנדרואיד עם הרבה אנרגיה:
מישרה 1: מפתח ישומים -- לינוקס, אנדרואיד, טכנולוגיות WEB.  
מישרה 2: תומך טכני למערכות מבוססות לינוקס בתחום התקשורת.

השתתפות מוכחת בפרוייקטי קוד פתוח ותכנה חופשית -- יתרון.

מקום העבודה: משגב \ כרמיאל

לפרטים:  j...@yaad.org.il


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Re: [Haifux] New mail icon for Thunderbird over Gnome

2012-05-13 Thread Oron Peled
On Sunday, 13 בMay 2012 19:22:20 Eli Billauer wrote:
 Hello all,
 I've finally started working with Thunderbird under Linux (FC12, with 
Thunderbird 3.0.7). The old settings were migrated perfectly,

If your new one is 3.0.7, I am afraid to ask what was the old ;-)

$ rpm -q thunderbird
thunderbird-11.0.1-1.fc15.i686

As you can see I use a pretty old Fedora (F15, plan to upgrade directly
to F17, before F15 is EOL). Still, using a network-facing application
which did not get any security updates for several years, is...
(ok, let's call it brave, not to be offensive...)

 and all is working fine. Well, there's a thing I miss.
 In Windows, there used to be an icon when new mail has arrived. This icon 
doesn't show up on Linux.

Obviously in Linux its a separate application (which is hopefully slimmer,
since it runs all the time).

IIRC, Gnome used to have a nice applet called mail-notification:
  http://www.nongnu.org/mailnotify
This supported multiple accounts/mailboxes/protocols, etc.

I believe you can find it pre-packaged even for your pre-historic Fedora.

Cheers,

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Re: [Haifux] Telling the kernel business is closed (my weekly riddle)

2011-06-27 Thread Oron Peled
On Monday, 27 בJune 2011 11:31:48 Eli Billauer wrote:
 Shachar Shemesh wrote:
 
  Nobody expects ENODEV on an already opened device. I'd go for EIO, 
  myself.
 And so shall I. Thanks.
 ...
 And the truth is that I don't care about recovering from such an error. 

Another strategy is to throw SIGPIPE at the relevant processes:
 * Con: it is usually expected upon write(2) not read(2) et-al.

 * Pros:
   - At least for write(2) the semantics is natural -- no more writes
 on this file descriptor.

   - Kills the offending process by default.

   - Process may catch it in a signal handler (easy to write some
 global cleanup + exit code)

Cheers,

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Re: [Haifux] [HAIFUX LECTURE - CANCELLED] Today's lecture is cancelled

2011-05-30 Thread Oron Peled
On Monday, 30 בMay 2011 17:37:18 Orr Dunkelman wrote:
 Due to mechanical problems with his car, Tomer will not be able to
 give his talk today, and thus, the Haifux lecture is cancelled.

WHAT? Now a boycot on Haifux? Next he'll want to fix his car
at the Shenkar College! Do you think Hamakor should raise
a car-maintenance fund to prevent this academic boycot?

:-)

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Re: [Haifux] MCTIP computer technician course

2011-02-20 Thread Oron Peled
On Sunday, 20 בFebruary 2011 09:47:49 amichay p. k. wrote:
 I prefer to choose this course, at least now, because it will give me a
 useful profession, and I finish it before the beginning of my military
 service.
 
 In addition, after the military service I can work as a computer
 technician, and
 to finance my studies in CS

Unless you practice this stuff *during* the army service, it would be
gone by the time you finish army:
 - You'll forget most of it.
 - A lot of the material would be obsolete (we are talking about
   technician level hands-on type of knowledge).

So a very focused and expensive training at this stage is investing
a lot of resource with verry little benefit (unless you somehow practise
this knowledge during army service)

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Re: [Haifux] No! No! Don't compile your kernel!

2011-01-24 Thread Oron Peled
On Monday, 24 בJanuary 2011 22:11:49 Eli Billauer wrote:
 ... It was easy enough to do for real. And I had this feeling 
 that the system was meant to be hacked. It belonged to me. And that's 
 fading away, most likely because nobody really seems to care about this. 
 Linux is becoming a piece of opaque spaghetti, but it's OK as long as 
 yum this or apt-get that trades one bug for another. Spaghetti is not 
 free software. Not in any sense.

1. You should not be too worried about the lost art of kernel
compilation from sources.
Yes, only a tiny  fraction of Linux users today compile their
kernel (gcc, whatever)., but comparing fractions is a mistake.
The *number* of people doing these compiles today in comparison
with, say, 15 years ago is many-fold.
It's simply that we now have many more people who are *only users*
and should take their needs in account *as well* -- It doesn't mean
we have less *developers* or that very few can do this the old way

2. The system in general *is* more complex today than 15 years ago.
But attributing this purely to developers surrendering fashion is
ignoring the real changes that affected Linux during this time:
a lot more architectures, more cpus (numa), dynamic peripherals
(scsi, usb, hot-plug pci, etc), hot-plugable cpus and ram (balloning)
 virtualization, embedded systems.
 And please note I only mentioned hardware related changes, ignoring
 functional changes (e.g: desktop integration)

So not only you can compile your own stuff today, many of us do this
pretty routinely (you cannot evade it completely in embdeded space yet).
However, if you want to compile key parts of a modern *desktop* you'll
simply have to work harder.

BTW: the apt-get/yum mentioned before in this thread would also help you
 compile on your own because they can both bring you the build
 dependencies (and document them for you) and also contain the
 steps required for the build (which you can compare with your
 manual process if you have problems).

Don't worry ;-)

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Re: [Haifux] Pulseaudio: Sounds good in theory

2011-01-13 Thread Oron Peled
On Wednesday, 5 בJanuary 2011 11:20:01 Eli Billauer wrote:
  But I now use Fedora 14, and all the glitches appear to be gone, 
 That tempted me to believe that I can just upgrade pulseaudio and forget 
 all about it.. As a matter of fact, I went for that approach. Time will 
 tell if that was really a quick fix.

You should note that some of the complexity is the result of greater
integration. This is true when we talk about audio which in
my case (Feora-14) invovles ALSA, pulseaudio, Phonon (yes I use KDE)
and the applications themselves (some KDE, some not)

However, you can see the same phenomena in the UI area (X-server,
X-server-drivers, kernel-drivers, desktops [including sometimes
composition managers, OpenGL, besides our loved window
managers)

Example for this integration:
 In another post, you asked about the mixer -- current GNOME
 and KDE mixers show/control the pulseaudio settings (including
 separate volume control for separate applications). However
 Older versions had problems because they saw both the
 ALSA hardware control (which only confuse the user, because
 their names vary for every audio-card) and the software
 mixer created by pulseaudio.

This means us normal users (not RH University graduates ;-)
have two options:
 * Becoming [semi)-experts in the (e.g: audio) domain. This has
   a lot of benefits, but not always possible (time limitations)

 * Trust our stack integrators, both upstream and packagers.
   At the same time, try to check them and help them by
   opening bugs, talking with them on mailing lists, IRC etc.

BTW: When pulseaudio entered Fedora it uncovered a *lot*
of latent bugs in different ALSA drivers. Part of the improvement
in pulseaudio over the latest release is due to fixing those kernel
bugs.

 The truth is that the difference between the versions is that FC12 gives 
 you 0.9.21-5, while FC14 gives 0.9.21-7. Pulseaudio itself switched to 
 0.9.22 only a month ago more or less, so I suppose they take 
 intermediate versions. Anyhow, I downloaded the RPMs intended for Fedora 
 14 and upgraded with them.

Again, trying to upgrade bits and pieces (with --nodeps?) will no doubt
help you graduate the RH University (unless you drop in the middle)

However, it's not the most effective way to solve your direct problem.
Fedora-12 is EOL for more than a month now -- if you don't want
to upgrade once/twice a year you may have chosen the wrong
distribution for your needs. I use Fedora exactly because of its
bleeding edge policy -- but that's me. I choose other distributions
when I need something with a long release cycle (Centos, Debian stable)

 By the way, my first attempt was to download the sources for 0.9.22, but 
 ./configure failed on some missing dependency. I suppose that only Red 
 Hat University graduates compile from sources nowadays.

The interesting question is *which* dependency?

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Re: [Haifux] Pulseaudio: Sounds good in theory

2011-01-13 Thread Oron Peled
On Wednesday, 5 בJanuary 2011 15:57:07 Nadav Har'El wrote:
 I've been using pavucontrol (I don't know what is padevchooser),
 and used it successfully to select between the sound card's microphone, and
 a USB-plugged microphone.

MeToo, but notice that it's not needed anymore with modern desktops.
Since Fedora-13 (I now user 14), both GNOME and KDE mixers are fully
pulseaudio aware and show the required controls natively.
So pavucontrol remains for people that use other (less common) desktops.


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Re: [Haifux] Login console freezes: Eli's weekly riddle

2010-11-06 Thread Oron Peled
On Sunday, 7 בNovember 2010 00:44:12 Eli Billauer wrote:
 The LKML thread is at http://lkml.org/lkml/2010/11/2/314 (for some 

Eli, I always suspected you are a programmer disguised as a EE, now
you proved me right ;-)

That was a very interesting read.

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Re: [Haifux] Kernel for Fedora: Repository or vanilla?

2010-09-20 Thread Oron Peled
On Monday, 20 בSeptember 2010 00:18:48 Eli Billauer wrote:
 What I tried to figure out was whether there's something stupid about 
 just downloading the lastest kernel regardless of rpm packages, compile 
 and install it. Like in the good old times when I knew what happened on 
 my computer.

It is a Fedora policy to actively roll all Fedora changes to upstream
projects (e.g: kernel). Combining this with the fast Fedora update
cycle (even within a single release), means the Fedora kernel is
not very different from upstream.

So to your direct question:
 * This means you normally can compile + use upstream kernel.
 * You will probably want to take a Fedora /boot/config-*
as the starting point of your customized .config build configuration.
 * You will (temporarily) loose all Fedora specific bugfixes. But as I
said, they should eventualy, be rolled back upstream.
 * It looks to me like a 'bumpier' road experience in terms of stability.
   (which is what you wanted in the first place)

 I like to know, that if something 
 worked a year ago, it will work when I try it today, and not try to keep 
 up with features I used being removed and bugs being added.

Hmmm... Just wanted to mention that bugs are even *removed*
in some rare events ;-)

 Would it be naive to assume that they would update packages even
 after EOL, if it comes to security threats?

Yes. In Fedora EOL is... well... End Of Life. Example:
 * Look at:
  ftp://ftp.uni-kl.de/pub/linux/fedora/linux/updates/11
 * Fedora policy is EOL for release N is one month after release
N+2
  * Fedora 13 was in 2010-05-25

https://secure.wikimedia.org/wikipedia/en/wiki/Fedora_%28operating_system%29#Version_history
  * Fedora 11 modification time of the directory is 2010-06-25

Older releases are moved to:
  http://archive.fedoraproject.org/pub/archive/fedora/linux/

There used to be a Fedora-Legacy project that tried to maintain security
fixes for older Fedora releases... no more:
http://www.fedoralegacy.org/

My conclusion -- either join the ride (I'm doing it for years) or look for
one of the slower alternatives I mentioned in my earlier post.

Enjoy,

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Re: [Haifux] Kernel for Fedora: Repository or vanilla?

2010-09-19 Thread Oron Peled
On Sunday, 19 בSeptember 2010 22:56:28 Eli Billauer wrote:

1. I'll start with your kernel question:
   $ rpmquery kernel-PAE
   kernel-PAE-2.6.33.8-149.fc13.i686
   kernel-PAE-2.6.34.6-47.fc13.i686
   kernel-PAE-2.6.34.6-54.fc13.i686

2. So F-13 was updated from 2.6.33 series to 2.6.34 series kernels.
   Many of the updates related to Radeon, since a lot of work
   was done on this architecture during last year
$ rpmquery --changelog kernel-PAE | grep -i radeon | wc -l
29

BTW: this is just from June-2010. If you'll check on F-12, you'll find a
 similar count from Mar-2009 to this July

 And I hope not to upgrade my computer in the next three-four years at 
 least.

3. As a Fedora user myself, I must say you may have chose the
   wrong distribution for your criteria.
   Fedora is fast paced distribution:
* Major release every 6 months
* Only two supported releases (n, n-1) -- your F-12 should be EOL
  this January (no more bug fixes, no more security updates)
* Many packages are updated during the ~1 year of a release
   (including the kernel)

4. If you want long maintenance cycle the best options now are:
* Wait few months for Debian-Sqeeze (real soon now)
* Wait few months for Centos-6 (REHL-6 are in Beta now)

 I happen to like when things work.

5. You are welcome to join us, Fedorans , with a 6-12 upgrade cycle.
   Things (mostly) work, and because of the fast updates, there are
   cases where you get fixes quicker -- (e.g: Radeon)
   Not to mention I like to develop with modern tools (gcc, autotools,
   libraries, etc.)

Oops, almost forgot. If you still want to compile your kernel. You may want
to start with current Fedora kernel as a basis:
  yum install rpmdevtools   # For the next utility
  rpmdev-setuptree# set up a empty packaging tree under ~/rpmbuild

  # Let's download + expand the tree
  yumdownloader --source kernel
  rpm -ivh kernel-.src.rpm
  cd ~/rpmbuild/SPECS
  rpmbuild -bp kernel.spec   # This is just the *prepare* build step
  cd ~/rpmbuild/BUILD/kernel-2.6.3*
  # You'll see two obvious directories: vanilla-2.6.x* and linux-2.6.3*

If you want to see how many patches separate the vanilla from Fedora:
  grep '^Patch[0-9]' ~rpmbuild/SPECS/kernel.spec | wc -l
It should be only 100-150 patches. If it looks bad to you, reconsider.
Distibutions that you wanted (3-5 years between major upgrades) have
around 1K patches   :-O

Cheers,

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If it's there and you can see it, it's REAL
If it's there and you can't see it, it's TRANSPARENT
If it's not there and you can see it, it's VIRTUAL
If it's not there and you can't see it, it's GONE!

Eli
 
 
 Rami Rosen wrote:
 
  Hi, Eli,
 

  So
  obviously there *are* updates to the kernel made by yum, but somehow
  without changing the kernel version.
  
 
  How many images do you have under /boot ? isn't it three?
  ( ls /boot/vm*) ? and how many entries in grub.conf ?
 
  In case you have enough time for installation , consider Fedora 13
  (Fedora 14, BTW,  should be available in 2.11.10)
 
 
  Rgs,
  Rami Rosen
 

 
 
 -- 
 Web: http://www.billauer.co.il
 
 
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Re: [Haifux] Kernel oops, so what?

2010-01-17 Thread Oron Peled
OK, I'll join in...

On Friday, 15 בJanuary 2010 16:27:34 Eli Billauer wrote:
 Now I get an oops warning every now and then, but nothing really 
 happens. And I wonder what is going on? Has the dreaded oops become 
 something one can live with?

Nothing really changed that much. An Oops is caused by illegal operation
in kernel space (e.g: null pointer dereference, division by zero etc.)
It always had two possible results:
 1. If it happened from an interrupt context -- a panic (prints a
backtrace on the console and freeze the machine).
 2. If it happened from a process context (e.g: in a system call), than
it's a normal Oops -- Don't PANIC ;-)
- The calling process is killed with a segfault (as we cannot continue
  any valid computation).
- A normal context switch happens.
- Everything continue normally, with the *hope* that there the bug
  did not cause big collateral damage (e.g: memory corruption)
  outside of the failed computation.

For many years, there were several kernel macros for triggering such
events from the kernel programmer side:
 - BUG() - causes an immediate panic
 - BUG_ON(condition) - think of it as a kernel assert()
 - WARN() - just the trace, no other ill effects
 - WARN_ON() - you guessed it.

[for an un-favorite example, try to create a work-queue with a name longer
 than ~10 characters -- you'll get an immediate panic, you can see the
 code somewhere in kernel/workqueue.c]

 And then there's this site which collects 
 oops reports (http://www.kerneloops.org/) which, judging by its sluggish 
 response, is a pretty busy project. Oopses keep flooding in.

1. That's an important project that gives a heads-up call for code
   regressions.
2. Fedora-12 now installs it by default, and integrates it into a
   new bug-reporting framework (ABRT, a very buggy software in itself ;-)
   This enables sampling new kernels on a huge amount of configurations
   and scenarios that was not possible before.

 So, should I just take it cool and wait for a new kernel with this 
 fixed, ignoring these messages?

Yes, unless you joined the kernel digging hobby. However, this
collaborative bug-collection frameworks increase the chance
for a quicker fix.

Cheers,

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   __
  / /  (_)__  __   __
 / /__/ / _ \/ // /\ \/ /  . . .  t h e   c h o i c e  o f   a
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Re: [Haifux] QEMU/KVM vs. VMWare: The beauty and the beast

2010-01-10 Thread Oron Peled
On Sunday, 10 בJanuary 2010 21:06:01 Eli Billauer wrote:
 Which makes me wonder: Is VMWare a honey trap, or is it currently the
 preferred choice?

It looks like there are solutions for converting VMWare disk images to
KVM (Qemu) disk images. Few (untested) links:
 1. http://rwmj.wordpress.com/2010/01/06/examine-vmware-esx-with-libguestfs/
[but this is for ESX, so may be irrelevant to you]
 2. http://kevinverma.blogspot.com/2007/11/convert-vmware-images-for-qemu-
etc.html
[a comment suggests that convertion isn't needed anymore]
 3. http://forums.fedoraforum.org/showthread.php?t=223522

If you can test it briefly and see that it work, than at least you are
not trapped. You may start using VMWare today and wait until missing
features are added to KVM. At least the DISPLAY part should move quickly
since Red Hat has significant investment in this:
 http://www.linux-kvm.com/content/rhev-spice-guest-drivers-released-windows

Bye,

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Re: [Haifux] Open Source Games or the Lack of Them

2009-09-19 Thread Oron Peled
On Friday, 18 בSeptember 2009 16:50:38 Shlomi Fish wrote:
 Since a typical game nowadays costs a lot of money to develop, and requires 
 the collaboration of many people, it seems unlikely that we will see many 
 open-source games that are up-to-par with commercial offerings.

Rubbish.

I can still remember when people thought that writing small utilities (e.g:
a shell) is OK, but a real COMPILER? Out of the question...

OK, maybe a compiler yes, but a KERNEL? Nah...

Surely, a full desktop is out of reach of a community effort...

H these are all the easy ones. GAMES are the ultimate obstacle.
No chance to tackle it. We are doomed :-O

Shana Tova and may the source be with you.

P.S: Shlomi, you've started debating by cross-posting to 3-4 large
 mailing lists.
 Cut it out! If you cannot choose the right mailing list for a
 post, just skip it until you do.

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Re: [Haifux] Missing UDP statistics in recent distributions (RcvbufErrors, SndbufErrors)

2009-07-28 Thread Oron Peled
Just a minor tidbit...

On 28.07.2009 Rami Rosen wrote:
 but in Fedora Core release 4 (Stentz) (2.6.11-1.1369_FC4) , we don't
 have it:
 Udp: InDatagrams NoPorts InErrors OutDatagrams
 
 I wonder what the situation is in Fedora 6. (but don't have access to
 such a machine).

Fedora 9 is already end-of-life, there isn't any need to check
any previous releases unless archeology is your hobby.

Yes, I know there are people and even companies that still uses them --
However, not caring about (security) updates is a big mistake that
cost not only them, but the rest of us (no, we don't want Linux
zombie networks, we already have enough Win* ones).

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[Haifux] OT: Bezeqint made me poof... he's gone

2009-06-09 Thread Oron Peled
Good day (cross-posted, check when replying).

A a previous customer of Actcom I continued with Bezeqint under
the same terms (including a contract renewal ~1 year ago).

Few days ago I accidentally discovered that my hosted homepage wasn't
accessible -- further tests + ~1 hour on the phone (navigating through
Bezeqint support structure) revealed the unbelievable

THE FREAKING BASTARDS PULLED THE PLUG ON THE DOMAINS WITHOUT EVEN TELLING 
ANYBODY.

I'm now in damage control mode (formal faxes to customer support, etc.)
Anybody else?

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Re: [Haifux] Linux Friendly Netbook?

2009-05-03 Thread Oron Peled
On 03.05.2009 Hetz Ben Hamo wrote:
 All the netbooks that are in the market today will work with any
 modern Linux distribution (Ubuntu 8.X, 9.X, OpenSuSE 10.X and up,
 Fedora 9 and above, RHEL 5 and above, Debian Lenny, etc) since those
 netbooks all use the same Intel crappy chipset which has Linux support
 for few years now.

Making sure you have a crappy Intel chipset is normally a good way
to have good Linux support out of the box.

However, there are exceptions. Specifically, the GMA-500
currently sucks big-time and unfortunately it is used by Dell
Mininote (and maybe others).

For some gory details (long URL):
http://www.happyassassin.net/2009/01/30/intel-gma-500-poulsbo-graphics-on-
linux-a-precise-and-comprehensive-summary-as-to-why-youre-screwed/

Cheers,

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Re: [Haifux] The 10th tip?

2009-02-07 Thread Oron Peled
On Saturday, 7 בFebruary 2009, Yossi Gil wrote:
 Moreover, in their second semester Introduction to Systems Programming
 they learn about makefiles, shell programming and other UNIX stuff.
 We just do not do enough to make this learning effective...

I'd like to mention that this is probably one of the worst software
courses in the Technion (unless its curriculum was totally changed).
The primary mistakes are:

 * Trying to cover 3 disjoint subjects in one course fails miserably.

 * The only people that know C++ after this course are those who
   knew it before or took OOP later.

 * Trying teaching them about the importance of modularization and
   encapsulation when they only experienced Mavo Letichnut is
   simply pathetic -- they technically understand it, but they
   don't get it.
   This should be given in a semester when they already had few
   sleepless nights debugging theirs (or other people) code.

 * The Unix part is tragic story in itself. Let's start with the simple
   fact it uses csh/tcsh (Nee, nee, nee, nee)
   It's only a third of a semester (actually less, as the more important
   subjects always rob some of the time). As a result, nothing useful can
   be taught.

If this poorly thought out course would be put to rest, it's hours
could be used to enforce some existing courses.
The best thing IMO would be not to use them for theory lecture hours,
but rather as extra labs or practice hours for the relevant courses.

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Re: [Haifux] Student complaints.

2009-02-03 Thread Oron Peled
On Tuesday, 3 בFebruary 2009, Amichai Rotman wrote:
 I had the same problem when I tried to play content broadcasted by CastUP (a
 popular streaming provider).

I encountered two unrelated problems with video streamed from web-sites:

1. Codecs. Easily solved by VLC. I've yet to see a codec
   unsupported by it.
   Note that some distros (e.g: Fedora) do not distribute these by
   default due to specific legal problems (US patents on algorithms).
   In less bizarre countries this is easily solvable by installing
   the missing pieces from non-US repositories (e.g: rpmfusion.org
   for Fedora).
   Me (non-lawyer) thinks that Israel has no software patents yet
   so this should be safe (Naive? Don't know).

2. Web sites trying to obfuscate the links from their page to the
   video stream so people would have to see it interactively instead
   of (e.g) reaping it to their computer/mp4-player/other-device for
   off-line viewing at their own leisure.

   This can usually worked around using Mazrim by Ilan Shavit:
http://sourceforge.net/projects/mazrim/

Cheers,

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Re: [Haifux] Some options for talks by a CEO from the silicon valley (on a special day)

2008-12-09 Thread Oron Peled
On Tuesday, 9 בDecember 2008, Orr Dunkelman wrote:
 Cathy Malmrose, the CEO of ZaReason, is about to visit Israel soon.
 ...
 I think that only if 10 people could commit for coming, it would
 be worth to schedule it. Of course, if you have any 
 preference, please let me know as well.

If someone from Affordy (http://www.affordy.com/) would meet her
before, there may be a chance for some cross-company sales effort
(we'll represent you here, you'll represent us there, market niches etc.).

If that miracle happens, then maybe the best lecture would be:

 Buying non-MS-taxed laptop in Israel without going to small claims court

Which would be an excellent sequel to Zvi Dvir's lecture about his case.

Hey, Affordy, do you listen?

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Re: [Haifux] Successful Windows Vista refund!!

2008-12-03 Thread Oron Peled
On Wednesday, 3 בDecember 2008, Zvi Devir wrote:
 News Flash: The first Windows refund in Israel!

Just read the news. This is a very big WOW and the PR was
also very good. Thanks for your time and effort.

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Re: [Haifux] Autoconf/Automake lecture tomorrow - please cancel

2008-07-27 Thread Oron Peled
On Sunday, 27 בJuly 2008, Hai Zaar wrote:
 I was going to give autoconf/automake lecture tomorrow.
 Unfortunately I can't make it - unexpected business meeting came in.
 
 We can reschedule it somewhere in late September/October.

If anyone want, I'm willing to do tomorrow my autotools
lecture (autoconf/automake/libtool). Just let me know
if anyone interested.

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Re: [Haifux] Git Lecture discussion

2008-02-05 Thread Oron Peled
On Tuesday, 5 בFebruary 2008, Ohad Lutzky wrote:
 Regarding keyword substituion: It turns out that Linus thinks it's a
 horrible idea: http://kerneltrap.org/mailarchive/git/2006/10/9/223932

His argument is that it may destroy binary files.

This is bogus since keyword-substitution is *off* by default.
It will occur only for files that were explicitly marked for
substitution. For example in subversion:

   svn propset svn:keywords Id Author Revision *.h *.c

As a substitute (pun intended) for the lack in this feature he gives
a hand crafted, build system dependent, manual (i.e: error prone) method.

What a lame excuse.

[the .sig came out right this time...]

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Re: [Haifux] Linux Ubuntu in Haifa - help was needed , now some advise

2007-04-30 Thread Oron Peled
On Monday, 30 בApril 2007 09:33, [EMAIL PROTECTED] wrote:
 Any recommendation for HW to be used?
 ...
 -  VGA and sound: on board or are you
 recommending a low-cost add on card

Since these days anybody with Nvidia/ATI card has to fight to have
minimal 3D (even to play tuxracer, not to mention beryl/compiz fun)
I think that rules them out.

That basically leaves Intel on-board chipsets which are supported
out of the box by any modern Xorg.

An exception: One of my Pentium 4's have an on-board old ATI chipset
(Radeon 9100 IGP) -- it was bought before found about better alternatives.
This board magically started to have 3D acceleration after a normal
update of Xorg ~6 months ago (the chipset is old and featureless enough
that new versions of the free radeon driver caught up).
While miracles like that may happen, I keep myself away from depending on
them by avoiding ATI/Nvidia.

Cheers,

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Re: [Haifux] Suggestion for a haifux lecture

2005-12-07 Thread Oron Peled
On Wednesday, 7 בDecember 2005 16:32, Paramahansa Polo wrote:
 BTW, can somebody suggest an especific topic related to udev that is of
 his/her interest or that him/her considers a must-be-mention topic?

Actually, it's hard to talk about udev without giving context
about:
   - hotplug
   - hal
   - dbus
Or in other words, Project Utopia (Robert Love et.al).

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Re: [Haifux] Lecture Proposals

2005-08-29 Thread Oron Peled
On Monday, 29 בAugust 2005 20:53, Alon Altman wrote:
 Here are some topics I have suggested in the past:
 ...
 Please vote for one or more of these lectures you would like to hear.

That's easy: 1+2+3+4

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Re: [Haifux] Real-time write on *ANY* filesystem

2005-06-22 Thread Oron Peled
First, thanks for an interesting test plan.
Just a quick note (I currently don't have time for retesting):
  On Wednesday 22 June 2005 03:41, Eli Billauer wrote:
   And finally: Does an RAM FIFO help? Surprisingly, the answer is no.

Since you use stdio (fwrite), which by default does full buffering
in user space (c.f: setvbuf(3)) this does not surprise me.
Repeating the test with open/write/close etc, would give more
significant results (altough I suspect they would only be worse :-(

Tzahi mentioned XFS. While I'm not sure XFS would help with small
write chunks (Reiserfs seems like better candidate for these),
I'd like to mention a related feature the original XFS had on Irix
(I think this feature wasn't ported to Linux) -- You could assign
a special sub-volume in the filesystem as real-time. The kernel
would then give absolute priority to I/O requests related to that
sub-volume -- In marketing speech this would give you guaranteed
I/O response time (although I don't remember seeing any specific
constraints on this [that's why I call it marketing]).

Any other ideas anybody?

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Re: [Haifux] RAM FIFO

2005-04-27 Thread Oron Peled
On Wednesday 27 April 2005 15:08, Eli Billauer wrote:
 So I thought: Hmmm, how about a simple application, which allocates,
 say, 16 MB of non-pageable RAM (peanuts in today's terms), behaving
 like a simple data FIFO, which I put in the pipeline?

If you have enough RAM than the non-pageable requirement isn't
mandatory (it won't be paged since it's in the working set).
In that case, maybe a simple dd(1) [check the ibs= and obs= options]
may do the trick.

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Re: [Haifux] Proposed lecture - the Debian package acceptance procedure

2005-02-28 Thread Oron Peled
On Monday 28 February 2005 08:51, Shachar Shemesh wrote:
 Anyone interested?

Sure. Writing .spec's for RPMS became boring, now we'll
get to the real stuff :-)

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[Haifux] Announce: Kernel Course Slides

2005-02-04 Thread Oron Peled
Hi everybody,

My kernel course slides are available under a creative commons
license. Actually, this is their status since I first wrote
them at the end of 2003, but I wanted to test them for a while
before formally announcing them.

The slides are in PDF and planned for a 5 days course.
They were prepared using only free software tools (mainly
LaTex of course) and the sources are available too.

You are welcome to use them for any purpose while preserving
the license terms for the slides:
  http://creativecommons.org/licenses/by-sa/1.0/
and the code samples:
  http://www.gnu.org/licenses/gpl.txt

I welcome any fixes, enhancements etc. You may get your
name added to the one listed on the THANKS page (let's
see if you can guess his name *before* peeking at slide
number 'IV' on the PDF file :-)

The files (source, pdf, signatures, etc.) are scattered
under my home page: http://www.actcom.co.il/~oron
go grab them.

Last shameless plug: Of course you may ask the author to
teach the course personally at your company, just
remember the saying --
  The slides are free, the instructor time isn't :-)
  [shamefully picked that paraphrase from Gilad]

Bye,

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 and Princeton University Professor
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[Haifux] A lecture, maybe, if you like?

2005-01-18 Thread Oron Peled
Hi,

Does anybody want to hear a (yet unwritten) lecture about

 Gnucash: How I manage my money and stay alive to
tell the story...
   
In which I'll present a great piece of free software which
is not (yet?) famous.

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 and Princeton University Professor
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Re: [Haifux] linux ipc

2005-01-16 Thread Oron Peled
On Sunday 16 January 2005 13:45, Muli Ben-Yehuda wrote:
 On Sun, Jan 16, 2005 at 01:40:28PM +0200, yakoub abaya wrote:
 
  Is there a special interface for communication
  between  : device driver  - daemon ,
  other than conventional ipc ?
  ( i know of pipes , signal  kill )
 
 read and write on a device file, a new file system, /sysfs, /procfs,
 ioctl (not a good idea), add your own syscalls, etc, etc. 

And to make his life more interesting: NETLINK sockets...

 A better question is what do you want to do?

Maybe we should add this question to the FAQ. sigh :-(

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Re: [Haifux] man

2005-01-12 Thread Oron Peled
On Wednesday 12 January 2005 18:04, Ori Idan wrote:
 yakoub abaya wrote:
  Q: what is the number following in the parentheses ? (-- 2 in write(2) )
 The number is the man section number
 
 Sections are:
 ...

Ori, you gave him fish (good ones I must admit), but he need also a
fishing pole (AKA RTFM).  Each section has an intro man page,
so we can run:
   man 1 intro
   man 2 intro
   

  Q : how do i man write(2) ? , how do i use the 2 ?
 
 do man 2 write

And even better:
  man man

:-)

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Re: [Haifux] Xen and the art of giving talks

2005-01-12 Thread Oron Peled
Yes,

Comparisons to other free (Qemu, Bochs,...) and non-free (vmware)
are of course welcome...

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If it's there and you can't see it, it's TRANSPARENT
If it's not there and you can see it, it's VIRTUAL
If it's not there and you can't see it, it's GONE!

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Re: [Haifux] biulding drivers on linux2.6

2005-01-02 Thread Oron Peled
On Sunday 02 January 2005 08:36, yakoub abaya wrote:
 i don't understand how to build a simple driver i wrote
 i looked into  linux/Documentation/kbuild and read about makefile rules
 but what make command do i issue ?
 i tried :
 make  -C  /usr/src/linux SUBDIRS=$pwd modules

1. Using SUBDIRS= is still supported, but the new and prefered
   syntax for what you want is M=
2. It looks like your real error (unless you happen to use
   csh/tcsh), is writing $pwd (lower case) instead of $PWD.

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then they laugh at you, 
then they fight you, 
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Re: [Haifux] IBM Linux Study Group announcements on or off topic?

2004-11-26 Thread Oron Peled
On Thursday 04 November 2004 13:13, Muli Ben-Yehuda wrote:
 Would you be interested in receiving announcements of these biweekly
 sessions? Let me know.

It's a rhetoric question, isn't it :-?

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Re: [Haifux] Proposed Lecture - Linux USB Subsystem Layer (in Video4Linux Context)

2004-10-28 Thread Oron Peled
On Thursday 28 October 2004 14:14, Muli Ben-Yehuda wrote:
 Seconded. Looking forward to the talk. 

Me too, me too :-)

Moreover, it will force me to add a chapter to the Kernel
internals course slides:
  http://users.actcom.co.il/~oron/oron/docs/kernel/kernel-1.15.pdf

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pgpFaAJezUC5u.pgp
Description: signature


Re: [Haifux] proposed lecture(s) - linux VFS and writing a real file-system

2004-10-19 Thread Oron Peled
On Wednesday 20 October 2004 01:33, guy keren wrote:
 
 i was wondering if these will be of interest. in the past month i've been
 working on writing a silly file-system, and found that there is no good
 document (or book?) explaining the gory details (or does 'understanding
 the linux kernel' cover this _properly_?), so i that giving a proper intro
 would be interesting.

Yes.

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Mary had a little lambda,
Its syntax white as snow,
And every program Mary wrote,
She wrote in Lisp, you know.
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Re: [Haifux] Embedded OS Research

2004-05-17 Thread Oron Peled
On Monday 17 May 2004 16:09, Phillip Mousseau wrote:
 The information obtained by VDC will only be used to develop market
 insights.

When a programmer contributes a piece of code to a FOSS project
at least she knows she will be able to use the result.

And what do VDC offer the community in return for the information?
Satisfaction for helping VDC?

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Re: [Haifux] Re: Digital darkroom with the GIMP lecture slides

2004-04-12 Thread Oron Peled
Usefull LaTeX tip (especially for PDFs):

\usepackage[colorlinks=true]{hyperref}

% some more text...

and now let's put \url{http://www.gimp.org}

You can get all your URL's automagically linked in your PDF's.
BTW: The docs for hyperref are worth reading for other nice effects.

Cheers,

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We don't do windows...


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Re: [Haifux] Fetchmail: The Mail Herschale [1]

2004-02-05 Thread Oron Peled
On Friday 06 February 2004 02:45, Eli Billauer wrote:
 And this is where we reach the philosophic question: How do you know? ;)

Remind me of a different and sad mail-related problem I ran across.
I lately have started using kmail (for its hebrew support) after backing up
my mail directory (since kmail uses maildir/mbox and my previous MUA
used mh/mbox). It worked reasonably, so I have been using it for the
last several months. Two weeks ago something interesting happened:

  - My /home partition ran out of space (several big core files suddenly
filled the last free ~100MB).
  - While kmail failed to write the new mails it opened warning dialogs
for each failure (all of a sudden 5-10 dialogs appeared during mail
reception).
  - However, it happily vacuummed /var/spool/mail/oron :-O

So I've restarted my quest for a decent MUA. May go back to sylpheed
which is excelent, but no hebrew -- GTK-1.x app :-(

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Re: [Haifux] RHN on Fedora stations

2004-02-02 Thread Oron Peled
On Monday 02 February 2004 14:25, Dita Jacobovitz wrote:
 We need an automatic solution for the RHN up2date service for these 12
 stations,

One solution for up2date is 'current' (don't have the URL under my hand now)
from Duke university (IIRC). Haven't tested lately, so YMMV.

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Re: [Haifux] Re: InstaParty Thought - Buy/Receive the CD or Bust

2004-02-01 Thread Oron Peled
On Sunday 01 February 2004 11:18, Adir Abraham wrote:
 [a lot of valid points]
 ... You can conclude what happens with faster
 machines or those that include rich hardware features. I also assume that
 we'll have faster machines next year, so it will not take more than 40
 minutes in average.

Just adjusting some over-optimism: installation is very I/O bounded, and
disk speed is advancing very slow (comparing to Moore's law for CPU).

So unless next year you'll have everybody with SCSI disks, you won't
see a lot of speedup.

Still, I completely agree that the ~5GB full install is a wise decision in
the context of install parties to newbies who would have hard time
adding software. Worse, the typical newbie would assume that
if some 'Z' software isn't on her system -- than Linux doesn't have 'Z'
at all (actually, if an icon for 'Z' isn't on the menu than Linux doesn't
have 'Z' software :-)

So keep it that way, and it'll keep taking ~1hour/install...

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Re: [Haifux] encoding/decoding from mime / 1-D MR / 2-D MR / 2-D MMR formats to pdf or tiff

2004-01-29 Thread Oron Peled
On Thursday 29 January 2004 12:00, David Sapir wrote:
 I'm using Hylafax to receive faxes, and the machine emails the faxes as an 
 attachment. The OS is RH9.
 My qustion is: can anyone tell my how to convert the received data to pdf 
 files?

You can use tiff2ps (part of libtiff) to convert it to Postscript and then
ps2pdf (a wrapper around gs(1)).

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Re: [Haifux] ANN: Lectures: Writing device drivers in Linux and Windoze

2004-01-27 Thread Oron Peled
On Tuesday 27 January 2004 02:56, Muli Ben-Yehuda wrote:
 The first draft of the slides for this one are now available at
http://www.mulix.org/lectures/intro_to_linux_device_drivers/intro_linux_device_drivers.pdf.

Very good. Small remarks/questions:
  - I assume they learn the actual build procedure elsewhere. If not, than at
least some pointers are needed.
  - The idea to patch the core for hooking into timer interrupts is very
good for learning (the power of open source...). However, because
the interrupt you talk about is (by incident) the timer, people may
get the wrong idea that in Linux patching is needed for timing...
(which is a very common task). You may want to mention the existance 
of the simple timer_* API.
  - Some mention (maybe verbally) about kernel versioning (which is used
for their exercise?) -- Understanding the Linux kernel API's are
a moving target (intentionally...)
  - Are they getting (maybe in their lectures) some orderly view about:
  * Different locking schemes? (spinlocks, reader-writers, semaphores,...)
  * Different schemes for defering work? (softirqs, tasklet API,
work-queues, timer API's)

Bye,

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Re: [Haifux] Seminar Demos by Denis Girou

2004-01-18 Thread Oron Peled
On Sunday 18 January 2004 11:40, Gustavo Halperin wrote:
 For example the package   pst-fr3d I can't find.
   Do you now this class ??, Where I can download it??

Google for it -- first and second hits...

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Re: [Haifux] SOLVED: Permission denied

2003-11-17 Thread Oron Peled
On Monday 17 November 2003 14:49, Ron Artstein wrote:
 So we're back to the manual. I can see why the writers of a manual
 think that mount options belong in a section about mounting. But a
 good manual will also include a cross-reference from the section on
 permissions, 

Traditionally, man pages had a special section for this type of non-obvious
things. It was called BUGS or CAVEATS.

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write your own operating system.  It has worked every time for me
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Re: [Haifux] W2L0, second thoughts about kdevelop

2003-09-14 Thread Oron Peled
On Sunday 14 September 2003 15:53, Maor Meir wrote:
 When looking at the built-in documentation I found plenty if
 information on using kdevelop to create QT applications,
 this is way beyond the scope of W2L lecture 0.

Actually, creating any decent GUI program is way beyond the scope
for newbies (whatever platform/environment they use):
- Heavy OOP
- Callbacks/Listeners/Slots/What-you-call-them-today
- Containers and layout management
- Event propagation and widget (instances) tree

Not exactly Introduction for Programming stuff.

However, Kdevelop may be used as a show off stuff if it would be shown
together with other tools. Examples:
- Anjuta
- Eclipse (the free software one...)
- If there's an Emacs guru I would ask him to demo it
  as well (but drop it if there isn't someone who can
  really make it shine).

Showing several tools of the same family (IDE's) is important
because a lot of our potential audience suffers from uni-dimentional
vision simptom caused by inhaling too much Visual-Studio for too long
time.

It is extremely important to show there are *different* strategies
to reach the same goal. Once they understand this -- they already
got half of what Linux is all about.


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Windows is NOT a virus: a virus is small and efficient.
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