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• Shell script with ImageMagick: hangs forever?

  - by AP257

  I've generated a shell script that uses ImageMagick to convert and crop around 18000 images. Here's a sample entry (so there are 18000 of these): if [ ! -f ./cropped/16333-1.png ] then convert -crop 724x118+876+1989 ./lin/34.png ./cropped/16333-1.png echo cropping 16333-1 fi if [ ! -f ./cropped/16333-1_thumb.png ] then convert -define jpeg:size=400x100 ./cropped/16333-1.png -thumbnail '400x100>' -background transparent -gravity center -extent 400x100 ./cropped/16333-1_thumb.png echo thumbing 16333-1 fi The script only runs for about 2000 images before hanging forever. Am I missing something, or leaking memory somewhere? Thanks for your help!

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• Generate or update a PDF to include an encrypted, hidden watermark?

  - by Dave Jarvis

  Background Using LaTeX to write a book. When a user purchases the book, the PDF will be generated automatically. Problem The PDF should have a watermark that includes the person's name and contact information. Question What software meets the following criteria: Applies encrypted, invisible watermarks to a PDF Open Source Platform independent (Linux, Windows) Fast (marks a 200 page PDF in under 1 second) Batch processing (exclusively command-line driven) Collusion-attack resistant Non-fragile (e.g., PDF - EPS - PDF still contains the watermark) Well documented (shows example usages) Ideas & Resources Some thoughts and findings: Natural language processing (NLP) watermarks. Apply steganography on a randomly selected image. http://openstego.sourceforge.net/cmdline.html The problem with NLP is that grammatical errors can be introduced. The problem with steganography is that the images are sourced from an image cache, and so recreating that cache with watermarked images will impart a delay when generating the PDF (I could just delete one image from the cache, but that's not an elegant solution). Thank you!

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• Strange performance from RAID5 using WD RE4 disks

  - by Howard

  I've noticed a bit of a performance issue with some WD RE4 drives I'm using under AMD's hardware RAID solution. First a bit of background: Environment: Windows 7 home premium x64 HDD's: 3x 1TB WD Raid Edition 4 in a RAID 5 setup with 128 kbyte stripe (2TB usable space) Testing Tool: HD Tune, process set to "High Priority" Processor: AMD Phenom II x6 1100T Ram: 16GB DDR3/1600mhz Motherboard: MSI 970A-G45 The image below pretty much depicts the issue I'm having. Every test has the same thing, a period of similar length where the performance drops to a few megabytes a second. This can't be a TLER issue as the purpose of RE4's is to work around that. Any help would be greatly appreciated.

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• PNG files are not being displayed in IE and Vista's Sidebar

  - by Wbdvlpr

  Hi, I am using Windows Vista. I was just visiting a website and found some "missing" images boxes on webpages. And, I could see this for many of the websites I visited. Then I realised that only a certain type of image files are not being displayed, which is PNG. I restarted my computer and noticed that 2 of the sidebar gadgets were missing background images. The websites with "missing" images are working fine in Firefox though. So its a problem related to IE and some of the Windows files. Any ideas how do I get PNGs working in my IE and Sidebar etc. Thanks.

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• Why does Task Scheduler NOT re-run successfully completed tasks

  - by Teo

  I am using Task Scheduler on Windows 2008 x64. I have 3 tasks, running every night on different times without overlapping. It works for some days - usually 2-3 up to 10 (it's really random), then it stops running the tasks. When I look at the history, I see that the tasks completed successfully. In the UI, the column "Next Run Time" stays empty. The tasks are set to run on background; the account for running them is a domain one - it is valid and enabled. When I check with Process Explorer, there are no left-over processes associated with my tasks. I am completely baffled at what's going on.

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• No dialogues can be heard in a movie with a 5.1 audio

  - by Karthikeyan KC

  I recently purchased 'PHILIPS DSP56U' 5.l multimedia system and got it connected with my laptop. All the speakers are connected good and all the channels responded well for the test sounds. The stereo music tracks and other normal movies (stereo) plays good. I'm having a problem with playing a movie with a 5.1 audio track. I can hear the background soundtrack, weapon effects, but I cannot hear the dialogues (which I assume to be a separate track). I'm using VLC to play the movie and it would be grateful if someone help me through this :)

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• trap "" HUP v.s Nohup ? How can I run a portion of shell script in nohub mode?

  - by Alex

  I want to run a shell script over the weekend, but I wanna make sure if the terminal loses the connection, my script won't be terminated. I use nohup for the whole script invokation, but I also want to execute some portion of my shell script in a way that if someone closes my terminal, my script runs on the background still. Here is a simple example : #!/bin/bash echo "Start the trap" trap " " HUP echo "Sleeping for 60 Seconds" sleep 60 echo "I just woke up!" Please suggest what I should do ? The trap " " HUP seems like not working when I close my terminal tab.

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• How to generate user-specific PDF with encrypted hidden watermark?

  - by Dave Jarvis

  Background Using LaTeX to write a book. When a user purchases the book, the PDF will be generated automatically. Problem The PDF should have a watermark that includes the person's name and contact information. Question What software meets the following criteria: Applies encrypted, undetectable watermarks to a PDF Open Source Platform independent (Linux, Windows) Fast (marks a 200 page PDF in under 1 second) Batch processing (exclusively command-line driven) Collusion-attack resistant Non-fragile (e.g., PDF - EPS - PDF still contains the watermark) Well documented (shows example usages) Ideas & Resources Some thoughts and findings: Natural language processing (NLP) watermarks. Apply steganography on a randomly selected image. http://openstego.sourceforge.net/cmdline.html The problem with NLP is that grammatical errors can be introduced. The problem with steganography is that the images are sourced from an image cache, and so recreating that cache with watermarked images will impart a delay when generating the PDF (I could just delete one image from the cache, but that's not an elegant solution). Thank you!

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• Ubuntu displaying GDM but no login

  - by Shawn

  Ubuntu (Wubi, Lucid Lynx) boots and shows the login screen itself with the background and plays the boot sound but a list of users is never displayed. A mouse is on screen and I can move it but, alas, it does nothing. Dropping to a virtual term with CTRL+Alt+F# drops me to a cursor but I can't actually input anything. I can't boot into single-user with GRUB since it's Wubi and it never specifies a boot kernel directly in GRUB's initial menu.lst (only in files that it then reads from). Other details that may be helpful: Single monitor Same video card that's been working for months No new hardware Edit: I ssh'd in since it evidently booted up the sshd which is handy. dpkg-reconfigure gdm didn't do anything helpful. I do, however, get a "no seat-id found" when manually running it.

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• Can VMWare Workstation 7.x and Sun VirtualBox 3.1.x co-exist on the same Windows 7 64bit Host togeth

  - by Heston T. Holtmann

  Will installing Sun Virtual Box bash or interfere with my VMWare installtion? I don't need to run VMs from both Virtual-Machine software packages at the same time but I do need to run some older Virtual-Machines from Sun-Virtualbox on the same 64-bit Windows 7 host until I can migrate those VMs to VMWare. Before switching from Linux host to Windows host, I ensured to export the VirtualBox VM to an OVF "appliance" with intentions of importing into VMWare Workstation 7. But VMWare gives me an error stating it can't import it. Background info My old workstation host: 32-bit Ubuntu 9.04 running Sun Virtual Box 3.x hosting Windows-XP VM Guest for Windows Software app development (VS2008, etc) Needs I need to get my original Sun-VBox Windows-XP Guest running on my new Windows 7 Workstation either imported into VMWare or running on the Windows version of Sun-Virtual box (I have the VM-Guest Backed up and copied to the new computer data drive. New workstation host: 64bit Windows 7 running VMWare Workstation 7 to host 32bit Ubuntu 9.10 for linux project work.

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• Setup LDAP In WAMP

  - by Cory Dee

  I'm having a really tough time getting the LDAP extensions to work in PHP on a WAMP server. Here is what I've done: Went to C:\Program Files\Apache Software Foundation\Apache2.2\modules and made sure that mod_ldap.so exists. I've gone into C:\Program Files\Apache Software Foundation\Apache2.2\conf\httpd.conf and made sure that this line is not commented out: LoadModule ldap_module modules/mod_ldap.so I've gone into C:\Program Files\PHP\php.ini and made sure this line is not commented out: extension=php_ldap.dll I've made sure C:\Program Files\PHP is in the Path I've made sure C:\Program Files\PHP contains libeay32.dll and ssleay32.dll Restart apache phpinfo() still doesn't show mod_ldap as being turned on. It shows util_ldap under Loaded Modules, but that's the only reference anywhere to LDAP. For a bit more background, I originally posted this on SO.

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• Encoding video stream for playback on a vanilla Windows XP with mencoder

  - by Tamás

  I have a bunch of PNG files, generated from a script. They represent consecutive frames of a video sequence and I'd like to encode them into a single AVI file (or some other video format) using mencoder. What parameters should I use to ensure that the video can be viewed on a vanilla Windows XP using Windows Media Player with no extra codecs installed apart from the default ones? So far I've tried -ovc lavc -lavcopts vcodec=wmv2 and -ovc lavc -lavcopts vcodec=msmpeg4 with no success. (Background story: some of the people I'm collaborating with on a scientific project cannot install any codecs on their university computers without the help of the local sysadmins, who are of course not very willing to install anything. I'd like to ensure that they can also view the video files I am creating).

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• Are you aware of any client-side malware that sends lots of junk requests for .gifs?

  - by Matt Sherman

  I am getting dozens of 404 errors on my site that are requests for gif's with apparently random names, like 4273uaqa.gif and 5pwowlag.gif. I see that most of them are coming from one user. I assume something is happening in the background on her machine without her knowledge. I assume it's a malware thing on the client. Has anyone seen this behavior before? Would love to advise my customer that s/he has an issue. I'd also like to stop getting these 404 reports. :)

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• GDM login screen is not displayed with VNC

  - by niboshi

  Hi, I set up VNC server with xinetd. Also configured GDM so that XDMCP is enabled. VNC connection seems okay, but GDM login screen is not shown. Instead I can only see old bare X screen (gray meshed background and X-shaped mouse pointer), which I can't do any interaction with it. What can I do to fix the problem? No log is written below /var/log/. Server distribution: Ubuntu marverick /etc/xinetd.d/vnc is like below: service vnc1024 { disable = no socket_type = stream protocol = tcp wait = no user = nobody server = /usr/bin/Xvnc server_args = -inetd -query localhost -geometry 1024x768 -depth 24 -once securitytypes=none port = 12345 } /etc/gdm/custom.conf: [daemon] [security] DisallowTCP=false [xdmcp] Enable=true [gui] [greeter] [chooser] [debug] [servers] /etc/services is also configured. Thanks

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• Troubleshooting intermittantly long 'page loading' problem

  - by justSteve

  Working off IIS 7 with an asp.net mvc app. Most page accesses are lightening quick. Sometimes the browser reports 'page loading' for an exceptionally long time. We are still in the development/testing mode so it's not a network/bandwidth issue. Happens in both IE and FF. No explicit error conditions in the server logs. If i could reproduce it i could run firebug/fiddler to give more info. As it is, it's a little too infrequent to simply leave both those running hoping for the condition to fire - unless/until that's the only option to get better info. I have a hunch this is client-side jquery/ajax related but only a hunch - don't have enough background in either jQuery or MVC to really know what can go wrong. Any initial troubleshooting suggestions welcome. thx

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• Does /NOCANDY avoid any adware-related activities with OpenCandy?

  - by Andrew Grimm

  OpenCandy claims that using the /NOCANDY switch when using a OpenCandy-affiliated installer allows you to avoid opencandy. Should I take their word for it? If not, can anyone independent of OpenCandy and their affiliates verify that /NOCANDY works? Background: About to install WinSCP onto a fresh Windows installation, and found out that new versions have OpenCandy associated with their installer. For the sake of balance, here's a link to WinSCP's FAQ on OpenCandy. The claim about /NOCANDY working appears on WinSCP's web site, but the same boilerplate appears on other OpenCandy web sites. If the OpenCandy people are offended by the tag "spyare": sorry, but it's the main tag here, rather than "adware".

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• How to handle user accounts for many sites running on same server

  - by Simon Courtenage

  Background to this question: I want to host multiple e-commerce sites on the same server, each with their own separate customer login application. Each site's login application needs to be secured by SSL. I'm unsure how best to handle this. For example, do I need to acquire a separate SSL certificate for each site (in which case, how do I do this dynamically, as the sites are created), or do I handle this using ONE login gateway-style application, which handles it on behalf of all the sites via a kind of transparent redirect? I'd be grateful for any pointers or advice. Thanks.

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• How do I open a pdf file with PDF X-Change Viewer so that I can still modify the pdf source?

  - by ltcomdata

  Whenever I open a pdf file with PDF X-Change Viewer it locks up the source pdf file to edits. Is there a way to open the pdf (with PDF X-Change Viewer) so that it doesn't lock-up the source file --- perhaps as a shell command with an option? The background: I use LaTeX to edit my pdf files, and preview the result with PDF X-Change Viewer. I must first close PDF X-Change Viewer before I can preview any changes I make in the LaTeX source. It would be nice if PDF X-Change Viewer did not lock-up the pdf source so that I could modify it without first closing PDF X-Change Viewer.

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• Prevent registry changes by users

  - by graf_ignotiev

  Background: I run a small computer lab of 10 computers using Windows 7 x64 Enterprise. Our users are set up as limited users. For additional restrictions, I set up local group policy for non-administrators using the microsoft management console. Problem: Recently, I found out that some of these restrictions had been removed. Reviewing the settings MMC and in ntuser.pol showed that the settings should still be in place. However, the related registry settings were missing in ntuser.dat. I already have registry editing disabled in the GPO (though not in silent mode). Question: What is the best way to deal with this situation? Should I look into preventing registry setting changes? Should I set up registry auditing to found out how these keys are getting changed in the first place? Or should I give up the ghost and write some kind of logon script that enforces registry values if they've been change? Any other ideas?

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• Web connection speed issue

  - by Iroll750

  I encounter a strange issue with my web (wireless) connection on my laptop (Ubuntu 11.10) I'm able to have 540kbps (down) on all computers in my house (including laptop at the same distance from the box) except me. When i do a speed connection test, i can have this optimal speed immediately after booting. As i surf on the net, watching videos, download things, etc... it becomes slower progressively until 100-110 kbps and the speed remain the same until i reboot. I tried to figure out if a process consume bandwith in background with nethogs but i found nothing suspicious. Any ideas ? Thanks in advance for your help !!

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• Full Backup & Restore for Windows Vista

  - by Thomas Matthews

  I'm looking for a freeware or low cost application that will backup everything, including registry on Windows Vista Home Premium and to restore from a CDROM disk. The destination is an external hard drive on USB 2.0. Searching on SuperUser and Stack Overflow show articles, but don't mention full backup of the registry and complete restore using CDROM. I would also like to have compressed output and incremental backups. One article mentions CloneZilla, but their web page says that the incremental feature is not supported. I am using Windows Vista Home Premium, Service Pack 1. I need to backup 200 GB onto a 230 GB drive and would like to have multiple backups (thus the need for compression). Other requirements: Single file restore Quality is more important than performance. Application must run on Windows Vista. Extra: Run as daemon or background task on 4 user system. Thanks

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• What's the best way to monitor a large number of application pools in IIS7?

  - by Kev

  Some background first - We're running IIS 7 on Windows 2008. We're running around 250 websites per server with each site in it's own application pool. I need a way to monitor each application pool for crashes and hangs and to send an email alert if an application pool is unresponsive for more than say 2 minutes. I thought about having a virtual directory mapped into each site with an ASP.NET page that we could poll via our existing monitoring system (HostMonitor). Does anyone else have experience in this area?

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• Can I make ssh tell me which control file it would use for multiplexing?

  - by Ryan Thompson

  I am using the following options in my ~/.ssh/config in order to enable connection multiplexing: ControlMaster auto ControlPath ~/.ssh/control/master-%r@%h:%p However, this has the annoying problem that the first shell to connect to a particular server must be the last to disconnect, because it is the master connection that all the other connections are using. So if you log out of the master, it appears to just hang. To solve this, I would like to wrap ssh with a script that checks if the control master file exists, and if not, starts a master ssh process in the background. Then it would start a slave ssh session. In order to accomplish this, my script would have to determine the path to the control file that ssh would use. This would entail parsing the ssh command line options and config files and implementing the logic for determining the ControlPath. Is there any way to just ask ssh what path it would use, so I can check it?

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• Create and use intermediate certificate authority on Windows Server 2012?

  - by Sid

  Background: Server OS is Windows Server 2012. GUI is installed as we come upto speed with powershell. Setup is staging, not production (yet). We have our (internal, domain limited) Root CA installed. I would like to take the Root CA offline to secure storage but before that I'd like to setup an intermediate CA which can take over actual live, online (int-RA-net) functionality Can someone guide me covering: creating the intermediate CA certificate request installing the intermediate CA certificate on domain controller (certification authority role already installed with Root CA online right now) use the intermediate CA to generate a certificate (any use certificate, just for demonstration purposes) Obviously this certification chain would be invalid on computers outside our domain (self trusted root - our root certificate is NOT from common 3rd parties). This last point is NOT a problem.

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