Re: atomically concurrent writes question

[Jon Leonard]

On Wed, Jun 23, 2010 at 01:19:01AM -0500, Ron Johnson wrote:
> On 06/23/2010 12:51 AM, Evuraan wrote:
>> I've a script which forks and echo's [appends] multiple long lines to
>> one plain text file.  some of the multiple threads also yank lines
>> from the same plain text file. this file is now approx 31M and has
>> about 105000 lines ( growing.)   i've been doing this for years now,
>> and have seen nothing go wrong so far. (yay!)
>>
>>
>> my question is rather theoretical - what can go wrong if multiple
>> processes are writing to the same file at multiple instances?
>>
>> i've read elsewhere, that the kernel takes care of this stuff. or is
>> it that i could just not cause finitely concurrent writes to the file
>> and have not seen a corrupt line just by luck?
>>
>
> Not only the kernel, but *bash* (or whatever other lesser shell you  
> use...) is what you'd need to look at to see what it does when it sees 
> ">>".

It's using the O_APPEND flag on the writes, which guarantees that each
write(2) system call operates atomically.  That is, the data on a given
write will be added to the end of the file, and if two or more processes
are writing to the file at the same time, the results will be consistent
with some ordering.  (Data will not be mixed or corrupted between writes.)

It's important to make sure that each line does fit in the same call to
write(), though.  I'm not sure what's meant by "long lines":  If they're
too big to process all at the same time, the guarantees for a single
call to write() no longer apply.  But the shell is almost certainly doing
the right thing.  (In C code, I'd check it very carefully.)

Jon Leonard


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Re: LEMP Development Server

[Camaleón]

On Wed, 23 Jun 2010 08:55:39 +0800, GNUbie wrote:

> I am seeking an advice on the best way to setup a LEMP development
> server. The web service is OK already since all the users will have its
> own UserDir directive. My only remaining problem is on how I can give an
> administrative privileges on the MySQL server to all the users that will
> not affect other users.

LAMP, Linux Apache Mysql PHP
http://wiki.debian.org/LaMp

Create only one user with admin rights and the rest with the required/
needed privileges so they can "develop" but not "destroy" the DB  
server :-)

Greetings,

-- 
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Re: atomically concurrent writes question

[Ron Johnson]

On 06/23/2010 12:51 AM, Evuraan wrote:

I've a script which forks and echo's [appends] multiple long lines to
one plain text file.  some of the multiple threads also yank lines
from the same plain text file. this file is now approx 31M and has
about 105000 lines ( growing.)   i've been doing this for years now,
and have seen nothing go wrong so far. (yay!)


my question is rather theoretical - what can go wrong if multiple
processes are writing to the same file at multiple instances?

i've read elsewhere, that the kernel takes care of this stuff. or is
it that i could just not cause finitely concurrent writes to the file
and have not seen a corrupt line just by luck?



Not only the kernel, but *bash* (or whatever other lesser shell you 
use...) is what you'd need to look at to see what it does when it 
sees ">>".



hope this question make sense.



It does...

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atomically concurrent writes question

[Evuraan]

I've a script which forks and echo's [appends] multiple long lines to
one plain text file.  some of the multiple threads also yank lines
from the same plain text file. this file is now approx 31M and has
about 105000 lines ( growing.)   i've been doing this for years now,
and have seen nothing go wrong so far. (yay!)


my question is rather theoretical - what can go wrong if multiple
processes are writing to the same file at multiple instances?

i've read elsewhere, that the kernel takes care of this stuff. or is
it that i could just not cause finitely concurrent writes to the file
and have not seen a corrupt line just by luck?

hope this question make sense.

many thanks in advance.


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i915 mod insert blanks screen

[Alexander Samad]

any one had this problem with new laptops.

udev finds the i915 and does a mod insert and bang screens gone

Alex


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how to rebuild single kernel module

[Alexander Samad]

I need to make a quick change to a kernel module, I would like to just
get the source and make the change and build.

How can I build ??? I did a google, but couldn't find the debian way
of building with linux-headers..


Alex


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Lockups in Xorg with Radeon HD 3450 and different drivers

[Nick Lidakis]

I seem to be having severe issues in getting a Radeon HD 3450 working with
Xorg and Debian.

System is:

latest Debian unstable
kernel 2.6.32-4-686
latest Xorg included in Debian unstable 7.5
xserver-xorg-video-radeon1:6.13.0-2
xserver-xorg-video-radeonhd  1.3.0-3

I'm using openbox and xterms. I start X via startx at CLI. No compositing.


Hardware:

Radeon HD 3450 LE is a Dell OEM unit with dual DVI split on a cable.

Hardware:

Radeon HD 3450 LE is a Dell OEM unit with dual DVI split on a cable.

lscpi -v:

01:00.0 VGA compatible controller: ATI Technologies Inc RV620 LE [Radeon HD
3450] (prog-if 00 [VGA controller])
Subsystem: Dell Device 0342
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at c000 (64-bit, prefetchable) [size=256M]
Memory at d100 (64-bit, non-prefetchable) [size=64K]
I/O ports at b000 [size=256]
Expansion ROM at d000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1
Len=010 
Kernel driver in use: radeon

Scenario 0:

radeon-kms-conf modeset=0
kernel 2.6.32-4-686
driver=radeon

I can see my standard grey solid background. Mouse cursor moves at normal
speed for 3 seconds then slows to a crawl. Can switch VT. Able to SSH, CPU's
pegged at 100%. 

Relevant error messages from Xorg log:

(WW) RADEON(0): Option "UseAtomBIOS" is not used
(--) RandR disabled

and

[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80addcb]
1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80a053b]
2: /usr/bin/X (xf86PostMotionEventP+0xd2) [0x80b3492]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0x92e29000+0x4831) [0x92e2d831]
4: /usr/lib/xorg/modules/input/evdev_drv.so (0x92e29000+0x4b26) [0x92e2db26]
5: /usr/bin/X (0x8048000+0x6997f) [0x80b197f]
6: /usr/bin/X (0x8048000+0x1077d4) [0x814f7d4]
7: (vdso) (__kernel_sigreturn+0x0) [0xb772e400]
8: /usr/lib/libdrm.so.2 (drmCommandNone+0x32) [0xb72a22a2]
9: /usr/lib/xorg/modules/drivers/radeon_drv.so (0xb71aa000+0x33c86)[0xb71ddc86]
10: /usr/lib/xorg/modules/drivers/radeon_drv.so (0xb71aa000+0xb7ec1)[0xb7261ec1]
11: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x48c8) [0xb6fda8c8]
12: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x4e76) [0xb6fdae76]
13: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x4fc3) [0xb6fdafc3]
14: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x5742) [0xb6fdb742]
15: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x2439) [0xb6fd8439]
16: /usr/lib/xorg/modules/libexa.so (0xb6fd6000+0x76f3) [0xb6fdd6f3]
17: /usr/bin/X (0x8048000+0x1755ef) [0x81bd5ef]
18: /usr/bin/X (0x8048000+0xc517c) [0x810d17c]
19: /usr/bin/X (0x8048000+0xc1663) [0x8109663]
20: /usr/bin/X (0x8048000+0x2c0d7) [0x80740d7]
21: /usr/bin/X (0x8048000+0x1e8fa) [0x80668fa]
22: /lib/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0xb7465c76]
23: /usr/bin/X (0x8048000+0x1e4e1) [0x80664e1]





Scenario 1:

radeon-kms-conf modeset=0
kernel 2.6.32-4-686
driver=radeonhd

Cpu's pegged at 100%; able to SSH; no mouse cursor; my solid grey background
visible.

Relevant errors from this Xorg logm, error message goes on for more than a
few pages.

(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!
(WW) RADEONHD(0): DRMCPIdle: DRM CP IDLE returned BUSY!






Scenario 2:

radeon-kms-conf modeset=1
kernel 2.6.32-4-686
driver=radeon

Not able to SSH; screen goes black after seeing my grey background for 1 sec;
monitor then goes into standby. No Magic SysRq response.

(WW) RADEON(0): Option "UseAtomBIOS" is not used
(--) RandR disabled




 I did try an older kernel (2.6.30) and can get Xorg up, but there is no Xv
and 2D acceleration is disabled. Lockups happen when no xorg.conf is
specified, as well. 

Maybe I should also note that I have had issues with the card I was
replacing. Also a OEM Dell Radeon x1300 PCI-e. Using the radeon driver would
give me small "flashing" horizontal lines of green, red and blue. Using the
radeonhd driver 2D worked very well, but I would get hard lockups if I tried
anything 3D, like xscreensaver.

Do Dell OEM video cards do things differently?

xorg.conf is attached.


P.S. Will the debian user list bounce a message if it has too many
attachments? I tried sending this twice before with 3 Xorg log files, in
their entirety, attached.
Any ideas on how to proceed? My X logs mention that my server goes into an
infinite loop. Not

Re: cups and draft mode

[Manon Metten]

Hi Pol,

> Using cups on debian testing, the page printed seems in draft mode (the
> resolution is 1200x1200).
> How check (and disable) draft mode in cups?

Use your webbrowser to access the cups interface:

0:  http://localhost:631/
1.  Manage Printers
2.  Set Printer Options
3.  Printout Mode

Manon.


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LEMP Development Server

[GNUbie]

Hello all,

I am seeking an advice on the best way to setup a LEMP development
server. The web service is OK already since all the users will have
its own UserDir directive. My only remaining problem is on how I can
give an administrative privileges on the MySQL server to all the users
that will not affect other users.

Please advice. Thank you in advance.

GNUbie


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Re: Showing recommended packages from cli

[Greg Madden]

On Tuesday 22 June 2010 08:34:57 Boyd Stephen Smith Jr. wrote:
> On Monday 21 June 2010 12:27:47 Todd A. Jacobs wrote:
> > Is there some functionality in apt-cache or aptitude for displaying
> > recommended files, other than having to visually parse the output of
> > "apt-cache show"?
>
> If you can handle the *curses interface of aptitude do:
> 1. Execute 'aptitude'.
> 2. Press Ctrl+T.
> 3. Use left/right to navigate to "Views".
> 4. Use up/down to navigate to "Audit Recommendations".
>
> This shows anything recommended but not installed.  By using up/down to
> highlight a particular recommendation, you can see why it is recommended in
> the bottom pane.
>
> Aptitude does this (mostly) with a package limit, and we can easily see
> what it is.  Press 'l'.  This allows you to edit the package limit, but it
> shows the current one so we can note it.  "!~v!~i~RBrecommends:~i"
>
> With this magic string, we can get much of this data from the command line.
> Simply issuing (aptitude search '!~v!~i~RBrecommends:~i') from the shell
> will basically give us the data in the top frame.
>
> For any particular package in that list (e.g. policykit-gnome), you can
> also determine why it would be recommended from the command line.  Simply
> issuing (aptitude why '~i' 'policykit-gnome') will give the "most
> installed, strongest, tightest, shortest" reason to install that package,
> which should be a recommendation.  Try (aptitude -v why '~i'
> 'policykit-gnome') for other interesting results.

Thanks for the info. I am trying to migrate from dselect to aptitude.

To do a search in aptitude I use the '/' option. In dselect  the search 
feature is the same '/', once you enter your search if you keep pressing 
the '/' key you cycle through all the matches to the search string.

 In aptitude the '/'  key brings up the search dialog again and I have to 
press three keys to continues the search,
 '/' to open search dialog, 
'tab' key to select the 'OK' or ''Cancel' button, 
then the 'enter' key to find , repeat.

I am wondering if I am missing a feature of aptitude, or if I just need to 
learn the new way. ?



-- 
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Greg


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Re: JAVA installation

[Carlos Eduardo Virgen Londoño]

2010/6/22 J.Hwan.Kim 
>
> Hi, everyone
>
> I'm trying to install java JDK and JRE.
> I downloaded JDK(jdk-6u20-linux-i586.bin) and JRE 
> (jre-6u20-linux-i586.bin)frome java.sun.com
> I commanded as follows but error occurred, so I could not make *.deb package 
> of JDK and JRE.
>
Helo, I use the non free repositories‎
In your file "/etc/apt/sources.list" add this line
deb http://http.us.debian.org/debian/ lenny main contrib non-free

And then
apt-get update

And Finaly
apt-get install sun-java6-jdk sun-java6-jre

>
> f...@frog1120:~/Electronics/JAVA/JRE$ fakeroot make-jpkg *.bin
>
> Creating temporary directory: /tmp/make-jpkg.KNFJHrppNn
> Loading plugins: blackdown-j2re.sh blackdown-j2sdk.sh common.sh ibm-j2re.sh 
> ibm-j2sdk.sh j2re.sh j2sdk-doc.sh j2sdk.sh j2se.sh sun-j2re.sh 
> sun-j2sdk-doc.sh sun-j2sdk.sh
>
> Detected Debian build architecture: i386
> Detected Debian GNU type: i486-linux-gnu
>
> No matching plugin was found.
> Removing temporary directory: done
>
> f...@frog1120:~/Electronics/JAVA/JDK$ ls
> jdk-6u20-linux-i586.bin
> f...@frog1120:~/Electronics/JAVA/JDK$ fakeroot make-jpkg jdk*.bin
> Creating temporary directory: /tmp/make-jpkg.sVRmpASAMQ
> Loading plugins: blackdown-j2re.sh blackdown-j2sdk.sh common.sh ibm-j2re.sh 
> ibm-j2sdk.sh j2re.sh j2dk-doc.sh j2sdk.sh j2se.sh sun-j2re.sh 
> sun-j2sdk-doc.sh sun-j2sdk.sh
>
> Detected Debian build architecture: i386
> Detected Debian GNU type: i486-linux-gnu
>
> No matching plugin was found.
> Removing temporary directory: done
>
>
> How can I solve this problem?
>
> Thanks in advance.
>
> Best Regards,
> J.Hwan Kim
>
>
>
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>



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Re: Sound in iceweasel? (fwd)

[I Rattan]

On Tue, 22 Jun 2010, Huang, Tao wrote:


On Tue, Jun 22, 2010 at 11:29 PM, I Rattan  wrote:

I missed the response, so, trying again.

-ishwar

-- Forwarded message --
Date: Fri, 28 May 2010 12:39:37 -0400 (EDT)
From: I Rattan 
To: debian-user@lists.debian.org
Subject: Sound in iceweasel?


I can play the same .flv in mplayer and the sound works
BUT if I paly it in iceweasel there is no sound (video
does work).


please specify what plugin you were using to play flv in iceweasel.


  flashplugin-nonfree

the 'libflashplayer.so' file is in ~/.mozilla/plugins dir.
as the plugin is not installed by
   apt-get install flashplugin-nonfree
 ..
-ishwar


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Re: JAVA installation

[Eduardo M KALINOWSKI]

>
> Hi, everyone
>
> I'm trying to install java JDK and JRE.
> I downloaded JDK(jdk-6u20-linux-i586.bin) and JRE 
> (jre-6u20-linux-i586.bin)frome java.sun.com
> I commanded as follows but error occurred, so I could not make *.deb 
> package of JDK and JRE.
>
>
> f...@frog1120:~/Electronics/JAVA/JRE$ fakeroot make-jpkg *.bin
>
> [...]
>
> How can I solve this problem?
>   

Is there any reason you can't use the prebuild packages in the non-free
section?


-- 
Save yourself!  Reboot in 5 seconds!

Eduardo M KALINOWSKI
edua...@kalinowski.com.br


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Re: How to replace a bugged version of a package?

[Boyd Stephen Smith Jr.]

On Tuesday 22 June 2010 10:08:30 Rodolfo Medina wrote:
> Here:
> 
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431388
> 
> it is reported a bug in Lenny's gopchop package.  On my system I have the
> bugged version already installed.  How can I replace it with a new debugged
> version?

I generally don't recommend going outside the repository system, but for this 
particular case, it may be easiest to just grab the .deb from the snapshot 
service and install with dpkg.

My reason for not going outside the repository system is to continue getting 
security updates.  If this is a large concern with this package AND you must 
have the newer version, I would consider a mixed system.
-- 
Boyd Stephen Smith Jr.   ,= ,-_-. =.
b...@iguanasuicide.net  ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-'
http://iguanasuicide.net/\_/


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Re: apt package preference

[Boyd Stephen Smith Jr.]

On Tuesday 22 June 2010 01:26:28 Michael Tsang wrote:
> Consider the following:
> Package foo is installed (version 1.0). As it is not in any of the
> repositories, its priority is 100.
> Package foo is available in both repo xyz and pqr. The version in xyz is
> 0.9 and its priority is 990; the version in pqr is 1.1 and its priority is
> 500. Can foo be upgraded to 1.1 or it will be left intact?

Foo will be upgraded to 1.1.  The 0.9 version is not considered because it is 
a downgrade and not does not have a priority above 1000.

Downgrades are not supported, so they are pruned rather early in apt(itude) 
processing.

If the 0.9 version had a priority of 1001, Foo would be downgraded to 0.9.

If the 1.1 version had a priority of less than 100, Foo would remain at 
version 1.0.
-- 
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Re: Showing recommended packages from cli

[Boyd Stephen Smith Jr.]

On Monday 21 June 2010 12:27:47 Todd A. Jacobs wrote:
> Is there some functionality in apt-cache or aptitude for displaying
> recommended files, other than having to visually parse the output of
> "apt-cache show"?

If you can handle the *curses interface of aptitude do:
1. Execute 'aptitude'.
2. Press Ctrl+T.
3. Use left/right to navigate to "Views".
4. Use up/down to navigate to "Audit Recommendations".

This shows anything recommended but not installed.  By using up/down to 
highlight a particular recommendation, you can see why it is recommended in 
the bottom pane.

Aptitude does this (mostly) with a package limit, and we can easily see what 
it is.  Press 'l'.  This allows you to edit the package limit, but it shows 
the current one so we can note it.  "!~v!~i~RBrecommends:~i"

With this magic string, we can get much of this data from the command line.  
Simply issuing (aptitude search '!~v!~i~RBrecommends:~i') from the shell will 
basically give us the data in the top frame.

For any particular package in that list (e.g. policykit-gnome), you can also 
determine why it would be recommended from the command line.  Simply issuing 
(aptitude why '~i' 'policykit-gnome') will give the "most installed, 
strongest, tightest, shortest" reason to install that package, which should be 
a recommendation.  Try (aptitude -v why '~i' 'policykit-gnome') for other 
interesting results.
-- 
Boyd Stephen Smith Jr.   ,= ,-_-. =.
b...@iguanasuicide.net  ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-'
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Re: Sound in iceweasel? (fwd)

[Huang, Tao]

On Tue, Jun 22, 2010 at 11:29 PM, I Rattan  wrote:
> I missed the response, so, trying again.
>
> -ishwar
>
> -- Forwarded message --
> Date: Fri, 28 May 2010 12:39:37 -0400 (EDT)
> From: I Rattan 
> To: debian-user@lists.debian.org
> Subject: Sound in iceweasel?
>
>
> I can play the same .flv in mplayer and the sound works
> BUT if I paly it in iceweasel there is no sound (video
> does work).

please specify what plugin you were using to play flv in iceweasel.


Tao
--
http://huangtao.me/
http://www.google.com/profiles/UniIsland

>
> Any pointers?
>
> -ishwar
>
>
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> http://lists.debian.org/pine.gso.4.64.1006221128200.5...@cps155.cps.cmich.edu
>
>


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Sound in iceweasel? (fwd)

[I Rattan]

I missed the response, so, trying again.

-ishwar

-- Forwarded message --
Date: Fri, 28 May 2010 12:39:37 -0400 (EDT)
From: I Rattan 
To: debian-user@lists.debian.org
Subject: Sound in iceweasel?


I can play the same .flv in mplayer and the sound works
BUT if I paly it in iceweasel there is no sound (video
does work).

Any pointers?

-ishwar


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Re: How to replace a bugged version of a package?

[Andrei Popescu]

On Ma, 22 iun 10, 17:08:30, Rodolfo Medina wrote:
> Here:
> 
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431388
> 
> it is reported a bug in Lenny's gopchop package.  On my system I have the
> bugged version already installed.  How can I replace it with a new debugged
> version?

There are the usual options (install from testing, backport from 
testing, ...), but in your case the fixed version is 1.1.7-8, while 
stable has 1.1.7-7.

If you don't care for the newer version from testing I would suggest 
downloading the binary version 1.1.7-8 from snapshot.debian.org and 
install it with 'dpkg -i'. Of course, this assumes there are no 
dependency problems (I didn't check).

Regards,
Andrei
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Re: How to replace a bugged version of a package?

[Jordan Metzmeier]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

On 06/22/2010 11:08 AM, Rodolfo Medina wrote:
> Here:
> 
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431388
> 
> it is reported a bug in Lenny's gopchop package.  On my system I have the
> bugged version already installed.  How can I replace it with a new debugged
> version?
> 
> Excuse the basicness of my question and thanks for any help
> 
> Rodolfo
> 
> 

In this case, because the fix is in the same upstream version, I would
grab the new deb from the package.debian.org [1] website and install
with dpkg. In other cases, you would look for backports and possibly
backport the squeeze version yourself.

[1] http://packages.debian.org/squeeze/gopchop


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How to replace a bugged version of a package?

[Rodolfo Medina]

Here:

 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431388

it is reported a bug in Lenny's gopchop package.  On my system I have the
bugged version already installed.  How can I replace it with a new debugged
version?

Excuse the basicness of my question and thanks for any help

Rodolfo


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Re: JAVA installation

[Camaleón]

On Tue, 22 Jun 2010 22:30:08 +0900, J.Hwan.Kim wrote:

> I'm trying to install java JDK and JRE. I downloaded
> JDK(jdk-6u20-linux-i586.bin) and JRE (jre-6u20-linux-i586.bin)frome
> java.sun.com I commanded as follows but error occurred, so I could not
> make *.deb package of JDK and JRE.
> 
> 
> f...@frog1120:~/Electronics/JAVA/JRE$ fakeroot make-jpkg *.bin

(...)

Check if that helps:

JDK install - no matching plugin
http://serverfault.com/questions/60132/jdk-install-no-matching-plugin

Greetings,

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Re: Gtk-WARNING **: Locale not supported by C library.

[Mathieu Malaterre]

Nevermind, the apt-get update was stuck on service restart and I did
not realize !

Everything is fine.

Sorry for the noise.

On Tue, Jun 22, 2010 at 1:36 PM, Mathieu Malaterre
 wrote:
> Hi,
>
>  I updated gcc-snapshot this morning, it updated locales, and then I
> realize something went wrong. When I start a gtk app I get warning:
>
> (process:5389): Gtk-WARNING **: Locale not supported by C library.
>        Using the fallback 'C' locale.
>
> I thought I could just reconfigure locales:
>
> $ sudo dpkg-reconfigure locales
> [sudo] password for mathieu:
> perl: warning: Setting locale failed.
> perl: warning: Please check that your locale settings:
>        LANGUAGE = (unset),
>        LC_ALL = (unset),
>        LANG = "en_US.UTF-8"
>    are supported and installed on your system.
> perl: warning: Falling back to the standard locale ("C").
> locale: Cannot set LC_CTYPE to default locale: No such file or directory
> locale: Cannot set LC_ALL to default locale: No such file or directory
> debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by
> another process: Resource temporarily unavailable
>
>
> Does this rings a bell to anyone here ?
>
> thanks,
> --
> Mathieu
>



-- 
Mathieu


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Gtk-WARNING **: Locale not supported by C library.

[Mathieu Malaterre]

Hi,

  I updated gcc-snapshot this morning, it updated locales, and then I
realize something went wrong. When I start a gtk app I get warning:

(process:5389): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.

I thought I could just reconfigure locales:

$ sudo dpkg-reconfigure locales
[sudo] password for mathieu:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by
another process: Resource temporarily unavailable


Does this rings a bell to anyone here ?

thanks,
-- 
Mathieu


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Re: 2 hardisks with same size shows big difference in LifeTime during smartctl self test

[Camaleón]

On Tue, 22 Jun 2010 14:49:02 +0530, Siju George wrote:

> I have 2 HDDS on RAID1

(...)

> I ran
> 
> smartctl -t long  on both the hard disks.
> 
> now when I take the log

(...)

> # 1  Extended offlineSelf-test routine in progress 90%   576
> -

> # 1  Extended offlineSelf-test routine in progress 90%60
> -

(...)

> why is the life time of sda around *10* times that of sdb ?

Mmm... as per "man smartctl", LifeTime(hours) is "(sic) The time at which 
the test took place, measured in hours of disk lifetime".

Are both disks "brand new" and "equals" (same manufacturer, same 
version), not just "same size"?

If yes, compare the output of "smartctl -A /dev/sd[ab]" and look for 
"Power On Hours" values. These, being a raid1, should be similar.

Greetings,

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Re: cups and draft mode

[Camaleón]

On Tue, 22 Jun 2010 11:36:42 +0200, Pol Hallen wrote:

> Using cups on debian testing, the page printed seems in draft mode (the
> resolution is 1200x1200).
> How check (and disable) draft mode in cups? thanks

Printer and driver?

Cups available options will vary depending on the driver being used.

Anyway, that options (resolution, draft mode, watermarks...) should be 
under printers tab → change printer settings.

Greetings,

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cups and draft mode

[Pol Hallen]

Hi folks :-)

Using cups on debian testing, the page printed seems in draft mode (the 
resolution is 1200x1200).
How check (and disable) draft mode in cups?
thanks
 
Pol


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Re: Simple dual boot - grun issue

[Jason Filippou]

I did install os-prober as directed and reran update-grub, and I'd
like to note the following output when I ran os-prober itself:

ja...@debian:~$ sudo os-prober
[sudo] password for root:
ls: cannot access /media/win: Input/output error
ls: cannot access /media/win: Input/output error
ls: cannot access /media/win: Input/output error
ls: cannot access /media/win: Input/output error
ja...@debian:~$

/media/win is, of course, the mountpoint of the ntfs partition holding
windows. Would this have anything to do with my problem?


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2 hardisks with same size shows big difference in LifeTime during smartctl self test

[Siju George]

Hi,

I have 2 HDDS on RAID1

srv1:~# dmesg |grep sda
[2.291895] sd 0:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
[2.291895] sd 0:0:0:0: [sda] Write Protect is off
[2.291895] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[2.291895] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[2.291895] sd 0:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
[2.291895] sd 0:0:0:0: [sda] Write Protect is off
[2.291895] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[2.291895] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[2.291895]  sda: sda1 sda2 sda3 sda4
[2.309892] sd 0:0:0:0: [sda] Attached SCSI disk
[2.572419] md: bind
[2.646614] md: bind
[2.668049] md: bind
[2.689747] md: bind
srv1:~# dmesg |grep sdb
[2.309971] sd 1:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
[2.310023] sd 1:0:0:0: [sdb] Write Protect is off
[2.310062] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[2.310079] sd 1:0:0:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[2.310167] sd 1:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
[2.310219] sd 1:0:0:0: [sdb] Write Protect is off
[2.310257] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[2.310275] sd 1:0:0:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[2.310334]  sdb: sdb1 sdb2 sdb3 sdb4
[2.334975] sd 1:0:0:0: [sdb] Attached SCSI disk
[2.574688] md: bind
[2.649835] md: bind
[2.668049] md: bind
[2.689747] md: bind
srv1:~#

I ran

smartctl -t long  on both the hard disks.

now when I take the log

srv1:~# smartctl -l selftest /dev/sda
smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8
Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_DescriptionStatus  Remaining
LifeTime(hours)  LBA_of_first_error
# 1  Extended offlineSelf-test routine in progress 90%   576 -

srv1:~# smartctl -l selftest /dev/sdb
smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8
Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_DescriptionStatus  Remaining
LifeTime(hours)  LBA_of_first_error
# 1  Extended offlineSelf-test routine in progress 90%60 -

srv1:~#

why is the life time of sda around *10* times that of sdb ?

thanks

--Siju


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Re: e2fsck: HOWTO tutorial

[Huang, Tao]

On Tue, Jun 22, 2010 at 1:33 PM, Augustin  wrote:
>
> Hello,
>
> I must learn to use e2fsck as I am having some I/O problems on some of
> my external drives.
> I checked all the existing documentation everywhere I could think of
> (including the Debian official documentation and existing HOWTOs from
> TLDP), but couldn't find anything that is detailed and explicit enough
> for my taste.
>
> I am left with some questions that I hope some of you will be able to
> answer.
>
> 1st, is there a way to run e2fsck in a strictly non-destructive but
> informative way, to check the health of a drive?
> (question asked here: http://linux.overshoot.tv/ticket/112 ).

-c
This option causes e2fsck to use badblocks(8) program to do a
read-only scan of the device in order to find any bad blocks.  If any
bad blocks are found, they are  added  to  the  bad block  inode  to
prevent them from being allocated to a file or directory.  If this
option is specified twice, then the bad block scan will be done using
a non-destructive read-write test.

is this what you want?

combine it with "-n" and check the exit code to see if errors are found.

> 2nd, to the dreaded question:
>
> # e2fsck -vfFC0 /dev/sdc1
> e2fsck 1.41.9 (22-Aug-2009)
> Pass 1: Checking inodes, blocks, and sizes
> Error reading block 34308186 (Attempt to read block from filesystem
> resulted in short read) while getting next inode from scan.  Ignore
> error?
>
> What are the consequences of answering either way?
> As far as I can tell: answering yes will delete the inode, i.e. data
> will be lost. Answering no will leave the bad block in place and the
> problem will remain.
>
>
> I have more questions on the topic but this should be a start.
>
>
> All your answers will be used to compile hopefully the best available
> tutorial on this important topic for a Linux system administrator.
> This is barely more than a stub:
> http://linux.overshoot.tv/wiki/hardware/e2fsck_file_system_check
>
> Thanks for your help,
>
> Augustin.


Tao
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Re: e2fsck: HOWTO tutorial

[Mark Allums]

On 6/22/2010 3:47 AM, Jochen Schulz wrote:


What's unclear about it?



The manpage doesn't say:  Okay, when this happens, run this.  When that 
happens, run that.  (That's what he wants.  And, I admit, what I want, 
sometimes.)





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Re: e2fsck: HOWTO tutorial

[Jochen Schulz]

Augustin:
> On Tuesday 22 June 2010 15:26:12 Ron Johnson wrote:
>> The *drive*?  No.  e2fsck checks the filesystem data structures
>>  that have been written onto the drive.
> 
> Yes, sorry. I did mean the partition, not the drive.

No, you didn't mean the partition, you meant the filesystem. ;-) The
usage of these terms is usually very lax, but after you realize that you
can create filesystems not only on partitions, but in other files, raw
storage devices (/dev/sdX) or logical volumes, the terms become quite
distinctive.

> No, it's unmounted. I'm checking an external device.
> As to checking mounted devices, the man page is very confusing:
> See: http://linux.overshoot.tv/ticket/112

I don't agree. It says:

- Don't fsck mounted filesystems.
- When run with -n, the fsck is read-only.
- Don't run fsck -n on mounted filesystems.

Maybe the paragraphs could be restructured a little, but I think all
these points come acrosse quite clearly.

BTW, what's the purpose of that site? Why are these bugs not reported
upstream? It looks like you are the sole user of that site.

> Is there a way to run e2fsck in a strictly non-desctructive, 
> informative mode only?

From the manpage:

 -n   Open the filesystem read-only, and assume an answer of  `no'  to
  all  questions.   Allows e2fsck to be used non-interactively.
  This option may not be specified at the same time as the -p or
  -y options.

What's unclear about it?

J.
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[Agree]   [Disagree]
 


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Re: e2fsck: HOWTO tutorial

[Ron Johnson]

On 06/22/2010 03:17 AM, Augustin wrote:

On Tuesday 22 June 2010 15:26:12 Ron Johnson wrote:

The *drive*?  No.  e2fsck checks the filesystem data structures
  that have been written onto the drive.


Yes, sorry. I did mean the partition, not the drive.


You need SMART to check the drive.


Yes, I haven't had time to install smartmontools, but I'll do it as
soon as I've fully understood and documented how to use e2fsck.



Hah!




I don't know.  First question, though, is: are you doing this on a
mounted filesystem?  If so, You're Doing It Wrong.


No, it's unmounted. I'm checking an external device.
As to checking mounted devices, the man page is very confusing:
See: http://linux.overshoot.tv/ticket/112



Yeah, I read that, but I think you're over-analyzing.  Just never 
fsck a mounted fs.



Boot from a Live CD (I like Sidux) and run the e2fsck that comes on
the CD.  The errors might just go away...


no :-/



Hmmm, that doesn't sound good.  Have you googled?  Was the fs 
cleanly unmounted?


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Re: e2fsck: HOWTO tutorial

[Augustin]

On Tuesday 22 June 2010 15:26:12 Ron Johnson wrote:
> The *drive*?  No.  e2fsck checks the filesystem data structures
>  that have been written onto the drive.

Yes, sorry. I did mean the partition, not the drive.
 
> You need SMART to check the drive.

Yes, I haven't had time to install smartmontools, but I'll do it as 
soon as I've fully understood and documented how to use e2fsck.

 
> I don't know.  First question, though, is: are you doing this on a
> mounted filesystem?  If so, You're Doing It Wrong.

No, it's unmounted. I'm checking an external device.
As to checking mounted devices, the man page is very confusing:
See: http://linux.overshoot.tv/ticket/112
 
> Boot from a Live CD (I like Sidux) and run the e2fsck that comes on
> the CD.  The errors might just go away...

no :-/


Thanks for the replies.


Is there a way to run e2fsck in a strictly non-desctructive, 
informative mode only?

The man page is confusing (see ticket above).

Thanks

Augustin.



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Re: e2fsck: HOWTO tutorial

[Augustin]

On Tuesday 22 June 2010 15:26:12 Ron Johnson wrote:
> The *drive*?  No.  e2fsck checks the filesystem data structures
>  that have been written onto the drive.

Yes, sorry. I did mean the partition, not the drive.
 
> You need SMART to check the drive.

Yes, I haven't had time to install smartmontools, but I'll do it as 
soon as I've fully understood and documented how to use e2fsck.

 
> I don't know.  First question, though, is: are you doing this on a
> mounted filesystem?  If so, You're Doing It Wrong.

No, it's unmounted. I'm checking an external device.
As to checking mounted devices, the man page is very confusing:
See: http://linux.overshoot.tv/ticket/112
 
> Boot from a Live CD (I like Sidux) and run the e2fsck that comes on
> the CD.  The errors might just go away...

no :-/


Thanks for the replies.


Is there a way to run e2fsck in a strictly non-desctructive, 
informative mode only?

The man page is confusing (see ticket above).

Thanks

Augustin.


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http://openteacher.info/ http://minguo.info/ 
http://www.wechange.org/ http://searching911.info/












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Re: apt package preference

[Ron Johnson]

On 06/22/2010 01:26 AM, Michael Tsang wrote:

Consider the following:
Package foo is installed (version 1.0). As it is not in any of the
repositories, its priority is 100.
Package foo is available in both repo xyz and pqr. The version in xyz is 0.9
and its priority is 990; the version in pqr is 1.1 and its priority is 500.
Can foo be upgraded to 1.1 or it will be left intact?


Have you tried, to see what happens?  --simulate was added for that 
reason.  I'd try this:


# apt-get --simulate install foo=1.1

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Re: e2fsck: HOWTO tutorial

[Ron Johnson]

On 06/22/2010 12:33 AM, Augustin wrote:


Hello,

I must learn to use e2fsck as I am having some I/O problems on some of
my external drives.
I checked all the existing documentation everywhere I could think of
(including the Debian official documentation and existing HOWTOs from
TLDP), but couldn't find anything that is detailed and explicit enough
for my taste.

I am left with some questions that I hope some of you will be able to
answer.

1st, is there a way to run e2fsck in a strictly non-destructive but
informative way, to check the health of a drive?
(question asked here: http://linux.overshoot.tv/ticket/112 ).



The *drive*?  No.  e2fsck checks the filesystem data structures that 
have been written onto the drive.


You need SMART to check the drive.



2nd, to the dreaded question:

# e2fsck -vfFC0 /dev/sdc1
e2fsck 1.41.9 (22-Aug-2009)
Pass 1: Checking inodes, blocks, and sizes
Error reading block 34308186 (Attempt to read block from filesystem
resulted in short read) while getting next inode from scan.  Ignore
error?


I don't know.  First question, though, is: are you doing this on a 
mounted filesystem?  If so, You're Doing It Wrong.


Boot from a Live CD (I like Sidux) and run the e2fsck that comes on 
the CD.  The errors might just go away...



What are the consequences of answering either way?
As far as I can tell: answering yes will delete the inode, i.e. data
will be lost. Answering no will leave the bad block in place and the
problem will remain.


I have more questions on the topic but this should be a start.



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Re: Administrating wview on a meteorologically-dedicated computer: tips / advices?

[Merciadri Luca]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Greg Madden  writes:

> On Monday 21 June 2010 13:41:12 Merciadri Luca wrote:
>> Hi,
>>
>> I am going to install and manage wview (see
>> http://www.wviewweather.com/, not commercial) on an university computer
>> for some project. I know that this is a really nice tool, but, as there
>> are many chances that I will be going to install the whole from scratch
>> (Debian, etc.) on a dedicated computer, do you have some advices / tips
>> for such an installation? I guess no, but who knows? If somebody has
>> already had some nice (or not) experiences with wview, or with a
>> meteorologically-Debian-y-dedicated computer, I would be glad to here
>> from you.
>>
>> Thanks folks!
>
> Cool stuff. Here is a link to some sites using wview, it shows the hardware 
> the sites are using.
>
> http://www.wviewweather.com/sites/index.html
Thanks.
- -- 
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apt package preference

[Michael Tsang]

Consider the following:
Package foo is installed (version 1.0). As it is not in any of the 
repositories, its priority is 100.
Package foo is available in both repo xyz and pqr. The version in xyz is 0.9 
and its priority is 990; the version in pqr is 1.1 and its priority is 500. 
Can foo be upgraded to 1.1 or it will be left intact?
-- 
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See http://www.gnu.org/philosophy/no-word-attachments.html


signature.asc
Description: This is a digitally signed message part.

getting current screen ID

[Siju George]

Hi,

debianCRG50:~# screen -ls
There are screens on:
2282.pts-7.debian  (Attached)
1400.pts-2.debian (Attached)
1162.pts-0.debian  (Attached)
954.pts-2.debian   (Attached)
1428.pts-5.debian  (Attached)
5 Sockets in /var/run/screen/S-root.

Out of these how do i find the ID of the screen I am currently logged
in and seeing the above output?

thanks

--Sijju


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Re: status of Snd soundfile-editor in squeeze???

[Jim McCloskey]

* Fabian Greffrath (fab...@greffrath.com) wrote:

  |>  Maybe you've got a wild mixture of old and new snd packages installed on 
  |>  your system. Please post the result of "dpkg -l snd\*".

Sorry to be slow (work got in the way) and thank you very much for your help. 
Here
is the output of dpkg -l snd\.*:

dpkg -l snd\*
Desired=Unknown/Install/Remove/Purge/Hold|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend|/ 
Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name  Version   Description
+++-=-=-==
ii  snd   11.6-1Sound file editor
un  snd-dmotif(no description available)
un  snd-dmotif-alsa   (no description available)
ii  snd-doc   11.6-1Sound file editor (documentation)
ii  snd-gtk   7.18-2.2  Sound file editor (GTK+ user interface)
un  snd-gtk-alsa (no description available)
un  snd-gtk-jack (no description available)
un  snd-gtk-pulse(no description available)
un  snd-smotif   (no description available)
ii  sndfile-programs  1.0.21-2  Sample programs that use libsndfile
ii  sndfile-tools 1.03-2A collection of programs for operating 
on sound files

Alessio Treglia  wrote:

  |> snd-gtk and snd-alsa are virtual packages provided by snd-gtk-{jack,pulse}.

I understood that these were virtual packages, but what seems to be new is that 
you
can't now run snd unless you use either jackd or pulseaudio. And as far as I can
see at least, this is an undocumented change.

Meanwhile, snd-gtk is still available in the respositories, as of version 
7.18-2.2:

--
apt-cache policy snd-gtk
snd-gtk:
  Installed: 7.18-2.2
  Candidate: 7.18-2.2
  Version table:
 *** 7.18-2.2 0
500 http://ftp.us.debian.org lenny/main Packages
100 /var/lib/dpkg/status

aptitude show snd-gtk
Package: snd-gtk 
State: installed
Automatically installed: no
Version: 7.18-2.2
Priority: optional
Section: sound
Maintainer: Guenter Geiger (Debian/GNU) 
Uncompressed Size: 2,748k
Depends: snd (>= 7.18-2.2), guile-1.6-libs, libatk1.0-0 (>= 1.20.0),
libc6 (>= 2.6.1-1), libcairo2 (>=
 1.4.0), libfftw3-3, libfontconfig1 (>= 2.4.0),
 libgl1-mesa-glx | libgl1, libglib2.0-0 (>= 2.14.0),
 libglu1-mesa | libglu1, libgsl0ldbl (>= 1.9), libgtk2.0-0 (>=
 2.12.0), libgtkglext1,
 libguile-ltdl-1, libice6 (>= 1:1.0.0), libjack0 (>= 0.103.0),
 libpango1.0-0 (>= 1.18.2),
 libqthreads-12, libsamplerate0, libsm6, libx11-6,
 libxcomposite1 (>= 1:0.3-1), libxcursor1 (>
 1.1.2), libxdamage1 (>= 1:1.1), libxext6, libxfixes3 (>=
 1:4.0.1), libxi6, libxinerama1, libxmu6,
 libxrandr2 (>= 2:1.2.0), libxrender1, libxt6
Conflicts: snd-dmotif, snd-dmotif-alsa, snd-smotif, snd-gtk-alsa
Replaces: snd (< 5.10), snd-dmotif, snd-dmotif-alsa, snd-smotif, snd-gtk-alsa
Provides: snd-gtk-alsa
Provided by: snd-gtk-jack, snd-gtk-pulse
Description: Sound file editor (GTK+ user interface)
 Snd is a powerful sound file editor that can be customized and
 extended using the Scheme programming language. 
 
 URL: http://www-ccrma.stanford.edu/software/snd/ 
 
 This package contains the files for the GTK+ user interface.

Tags: devel::lang:scheme, interface::x11, role::program,
scope::application, uitoolkit::gtk, use::editing,
  use::viewing, works-with::audio, x11::application
--

But if it's now possible in Debian to use snd only if one also uses either 
jackd or
pulseaudio, surely that should be documented somewhere (as far as I can see, it
wasn't true before).

I did try to install first jackd and then pulseaudio (along with their 
respective
snd-gtk-{jack,pulse} packages), but I still couldn't get snd to work. I couldn't
find any relevant documentation; the contents of /usr/share/doc/snd-gtk-jack is
just this:

/usr/share/doc/snd-gtk-jack:
  total used in directory 140 available 46325772
  drwxr-xr-x2 root root  4096 Jun 21 21:40 .
  drwxr-xr-x 2225 root root 90112 Jun 21 21:40 ..
  -rw-r--r--1 root root  5626 Jun  6 11:46 changelog.Debian.gz
  -rw-r--r--1 root root 30038 Jun  4 06:23 changelog.gz
  -rw-r--r--1 root root  1859 Jun  6 11:46 copyright

none of which tells me how I should make jackd and snd talk to each other. 

But thanks for listening and thanks for your help, and thanks for all of your 
work,

Jim

PS the kernel version is: 2.6.32-5-686; 
   alsa is 1.0.23+dfsg-1 from testing/unstable



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e2fsck: HOWTO tutorial

[Augustin]

Hello,

I must learn to use e2fsck as I am having some I/O problems on some of 
my external drives.
I checked all the existing documentation everywhere I could think of 
(including the Debian official documentation and existing HOWTOs from 
TLDP), but couldn't find anything that is detailed and explicit enough 
for my taste.

I am left with some questions that I hope some of you will be able to 
answer.

1st, is there a way to run e2fsck in a strictly non-destructive but 
informative way, to check the health of a drive?
(question asked here: http://linux.overshoot.tv/ticket/112 ).


2nd, to the dreaded question:

# e2fsck -vfFC0 /dev/sdc1  
e2fsck 1.41.9 (22-Aug-2009)   
Pass 1: Checking inodes, blocks, and sizes
Error reading block 34308186 (Attempt to read block from filesystem 
resulted in short read) while getting next inode from scan.  Ignore 
error? 

What are the consequences of answering either way?
As far as I can tell: answering yes will delete the inode, i.e. data 
will be lost. Answering no will leave the bad block in place and the 
problem will remain.


I have more questions on the topic but this should be a start.


All your answers will be used to compile hopefully the best available 
tutorial on this important topic for a Linux system administrator.
This is barely more than a stub:
http://linux.overshoot.tv/wiki/hardware/e2fsck_file_system_check

Thanks for your help,

Augustin.



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http://linux.overshoot.tv/ 
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Re: getting current screen ID

[Siju George]

On Tue, Jun 22, 2010 at 12:20 PM, Liam O'Toole  wrote:
> On 2010-06-22, Siju George  wrote:
>> Hi,
>>
>> debianCRG50:~# screen -ls
>> There are screens on:
>>         2282.pts-7.debian  (Attached)
>>         1400.pts-2.debian (Attached)
>>         1162.pts-0.debian  (Attached)
>>         954.pts-2.debian   (Attached)
>>         1428.pts-5.debian  (Attached)
>> 5 Sockets in /var/run/screen/S-root.
>>
>> Out of these how do i find the ID of the screen I am currently logged
>> in and seeing the above output?
>>
>
> The environment variable STY will tell you.
>

thank a million :-)

--Siju


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Re: getting current screen ID

[Liam O'Toole]

On 2010-06-22, Siju George  wrote:
> Hi,
>
> debianCRG50:~# screen -ls
> There are screens on:
> 2282.pts-7.debian  (Attached)
> 1400.pts-2.debian (Attached)
> 1162.pts-0.debian  (Attached)
> 954.pts-2.debian   (Attached)
> 1428.pts-5.debian  (Attached)
> 5 Sockets in /var/run/screen/S-root.
>
> Out of these how do i find the ID of the screen I am currently logged
> in and seeing the above output?
>

The environment variable STY will tell you.

-- 
Liam O'Toole
Cork, Ireland



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Re: Administrating wview on a meteorologically-dedicated computer: tips / advices?

[Merciadri Luca]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Ron Johnson  writes:

> On 06/21/2010 04:41 PM, Merciadri Luca wrote:
>> Hi,
>>
>> I am going to install and manage wview (see
>> http://www.wviewweather.com/, not commercial) on an university computer
>> for some project. I know that this is a really nice tool, but, as there
>> are many chances that I will be going to install the whole from scratch
>> (Debian, etc.) on a dedicated computer, do you have some advices / tips
>> for such an installation? I guess no, but who knows? If somebody has
>> already had some nice (or not) experiences with wview, or with a
>> meteorologically-Debian-y-dedicated computer, I would be glad to here
>> from you.
>>
>
> What more do you need than an external monitor connected to a cheap
> netbook?
Nothing, on the hardware point of view, but, on the software point of
view, did somebody realize that some unbundled packages were
interesting then coupled with wview?
- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

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Re: Torrents killing my conection

[Mark Allums]

On 6/21/2010 11:03 PM, Stan Hoeppner wrote:

Thus, with the same router, I could take a few different *nix OS flavors and
perl versions, blowing up the router with some, and not denting it with others.

It's all about the packet load you push through the router.  It's absolutely
normal for setups that "seem" the same to nuke the router, because once you
peek under the hood, they aren't really behaving the same at all.

Take a peek under the hood. :)


+1

This "exercise" has proven (as if there were any doubt) that not all 
equipment is created equal, nor operating systems, for that matter.


To further illustrate, my internet connection is a "tethered" Blackberry 
phone.  It loses it's mind frequently (about once a day), and has to be 
reset by pulling the battery.


It wasn't intended to be used heavily for this purpose.


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Re: Why does GNOME take so much time to tell that a screensaver-introduced password is erroneous?

[Merciadri Luca]

-BEGIN PGP SIGNED MESSAGE-
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"Karl E. Jorgensen"  writes:

> Hi!
>
> On Mon, Jun 21, 2010 at 05:47:21PM -0400, Celejar wrote:
>> On Mon, 21 Jun 2010 23:35:37 +0200
>> Merciadri Luca  wrote:
>> 
>> > I use GNOME.
>> > 
>> > I have noticed that if I type some erroneous password to leave the
>> > screensaver mode, GNOME takes ~3 or 4 secs. to tell me that it is
>> > erroneous. If I type the correct password, I am directly sent in my
>> > session. Why does it take so much time to tell me that a password is
>> > erroneous? I can even know if I made a typo by looking at how much time
>> > it takes!
>
> I believe that artificially introducing a delay when wrong credentials are
> presented is standard operating procedure for most things where a password 
> must
> be entered.  As far as I know, there are several rationales behind this:
>
> - To frustrate anybody trying to guess passwords. Being allowed to try many
>   combinations in a short time helps make things difficult for attackers, and
>   does not help legitimate users.
>
> - To avoid "leaking" information: If entering a "nearly-correct" password
>   responds faster than when entering an "obviously-wrong" password, an 
> attacker
>   can use this to improve the guesses - sort of triangulating.  If it always
>   takes the same amount of time before the "wrong username/password" reply
>   comes, this information is not available to a prospective attacker.
>
>   I presume that some implementations add a random delay to obfuscate things
>   further.
>
> All in all, this makes things more difficult for attackers, whilst only being 
> a
> minor inconvenience for the "good guys": a good trade-off.
>
>> Same thing with xscreensaver.  I think that a lot of software that asks
>> for a password behaves like this, perhaps to prevent brute-forcing?
>> I'm not sure if brute-forcing is possible on a GUI, though.
>
> I suspect this is simply a problem of aquiring the right tools for the job:
>
> - X events can be generated by software (e.g. the xmacro package).  This is
>   evident if you use VNC to control a remote machine:  the screen saver is
>   none-the-wiser to the fact that you are remote.
>
> - USB keyboards can probably be simulated by other devices. I would not be
>   surprised to find linux tools that allow a PC to act as a USB device, rather
>   than USB "master".  From here on, it is just software again.
>
> and probably lots of other ways...
Thanks (to others too).
- -- 
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See http://www.student.montefiore.ulg.ac.be/~merciadri/
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