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• Input/output error, when trying to install on netbook [closed]

  - by Ben

  Been trying to install ubuntu on my Samsung NB30 netbook, but I have been running into the same error over and over again. [Errno 5] Input/output error This particular error is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment. I'm installing from the USB bootable version, I get the exact same error at the exact same point when trying to install both ubuntu desktop and ubuntu desktop remix. I've tried redownloading both ISOs twice and I've tried two different USB sticks (one being completely new). I've tried installing from with in an ubuntu live session and I get the exact same problem. I've ran a bootable memtest and everything passes with no errors, I've also ran a dmesg in terminal after the installer fails here's what it reported - http://bit.ly/exAQRR Thanks in advance! EDIT: I know this was ages ago, but to anyone out there with the same issue, the problem turned out to be the downloaded image, my internet is poor at the best of times and the ISO failed the MD5sum check, if this happens to you I recommend you download the ISO image by torrent, it'll check the integrity of the file is maintained.

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• Transmission shutdown script for multiple torrents?

  - by Khurshid Alam

  I have written a shutdown script for transmission. Transmission calls the script after a torrent download finishes. The script runs perfectly on my machine (Ubuntu 11.04 & 12.04). #!/bin/bash sleep 300s # default display on current host DISPLAY=:0.0 # find out if monitor is on. Default timeout can be configured from screensaver/Power configuration. STATUS=`xset -display $DISPLAY -q | grep 'Monitor'` echo $STATUS if [ "$STATUS" == " Monitor is On" ] ### Then check if its still downloading a torrent. Couldn't figure out how.(May be) by monitoring network downstream activity? then notify-send "Downloads Complete" "Exiting transmisssion now" pkill transmission else notify-send "Downloads Complete" "Shutting Down Computer" dbus-send --session --type=method_call --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.RequestShutdown fi exit 0 The problem is that when I'm downloading more than one file, when the first one finishes, transmission executes the script. I would like to do that but after all downloads are completed. I want to put a 2nd check ( right after monitor check) if it is still downloading another torrent. Is there any way to do this?

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• sendmail on Ubuntu won't send from www-data user

  - by bumperbox

  I if call mail() function in PHP from webserver (running as www-data) i get an error sending email. If i call the same script from the cmdline logged in as root, then it works If i switch user to www-data and run from the cmdline i get this error message WARNING: RunAsUser for MSP ignored, check group ids (egid=33, want=107) can not chdir(/var/spool/mqueue-client/): Permission denied Program mode requires special privileges, e.g., root or TrustedUser. FAILEDWARNING: RunAsUser for MSP ignored, check group ids (egid=33, want=107) can not chdir(/var/spool/mqueue-client/): Permission denied Program mode requires special privileges, e.g., root or TrustedUser. FAILEDTest Complete$ WARNING: RunAsUser for MSP ignored, check group ids (egid=33, want=107) I am guessing i need to do something in sendmail configuration I have googled for some solutions but have ended up more confused. Can someone let me know what configuration I need to change to fix so i can send from www-data user?

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• I've been told that Exceptions should only be used in exceptional cases. How do I know if my case is exceptional?

  - by tieTYT

  My specific case here is that the user can pass in a string into the application, the application parses it and assigns it to structured objects. Sometimes the user may type in something invalid. For example, their input may describe a person but they may say their age is "apple". Correct behavior in that case is roll back the transaction and to tell the user an error occurred and they'll have to try again. There may be a requirement to report on every error we can find in the input, not just the first. In this case, I argued we should throw an exception. He disagreed, saying, "Exceptions should be exceptional: It's expected that the user may input invalid data, so this isn't an exceptional case" I didn't really know how to argue that point, because by definition of the word, he seems to be right. But, it's my understanding that this is why Exceptions were invented in the first place. It used to be you had to inspect the result to see if an error occurred. If you failed to check, bad things could happen without you noticing. Without exceptions every level of the stack needs to check the result of the methods they call and if a programmer forgets to check in one of these levels, the code could accidentally proceed and save invalid data (for example). Seems more error prone that way. Anyway, feel free to correct anything I've said here. My main question is if someone says Exceptions should be exceptional, how do I know if my case is exceptional?

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• Product Support News for Oracle Solaris, Systems, and Storage

  - by user12244613

  Hi System Support Customers, April Newsletter is now available The April, 2012 Newsletter for Oracle Solaris, Systems, and Storage is now available via document 1363390.1 *Requires a My Oracle Support account to access. Please take a few minutes to read the newsletter. The newsletter is the primary method of communication about what we in support would like you to be aware of. If you are not receiving the newsletter, it could be due to: (a) Your Oracle profile does not have the allow Oracle Communication selected (on oracle.com Sign In, or if logged in select "Account" and under your Job Role, check you have selected this box : [ ] Yes, send me e-mails in Oracle Products.... (b) you have not logged a service request during the last 12 months. Oracle is working to improve the distribution process and changes are coming and once they are ready I will write more about that. But today if you don't automatically receive the newsletter all you can do is save it as a favorite within My Oracle Support and come back on the 2nd of each month to check out the changes. This month I am really interested to find out from you is the Newsletter providing you the type of items that you are interested in. To gather some data on that, I have a small 2minute survey running on the newsletter or you can access it [ here ] Finally, if you think I am missing a topic in the Newsletter, let me know by taking the survey or suggesting a topic via this blog. Get Proactive Don't forget about being Proactive. The latest updates for Systems and Solaris pages in the Get Proactive area are now available. Check out document 432.1 and learn what proactive features are available for Systems and Solaris.

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• The tale of how the PowerShell CmdLets got installed with Azure SDK 1.4

  - by Enrique Lima

  I installed the Azure SDK 1.4 while rebuilding my laptop and ran the installation for the Windows Azure Service Management PowerShell CmdLets. Kicked off the installation script for the WASM PowerShell CmdLets by locating the path to which WASM PowerShell CmdLets was deployed to. Double clicked the startHere command. It will then open the WASM installation dialog. Click Next. Click Next. Notice the red x next to the Azure SDK 1.3, the problem is I have SDK 1.4 Here is the workaround, I go back to the location of the deployed WASM sources. Go into the setup path, then scripts>dependencies>check. Now, locate the CheckAzureSDK.ps1 file, and right-click, then edit. This is the content in the ps1 file, it check for the specific version of the Azure SDK, in this case, it is looking for version 1.3.11133.0038. We need for it to check for version 1.4.20227.1419 Now, save your ps1 file, go back to the open WASM install dialog, and click rescan. This time it should pass, then click next. A Command prompt window will appear, click any key. This completes the installation, click Close.

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• How to determine if a 3D voxel-based room is sealed, efficiently

  - by NigelMan1010

  I've been having some issues with efficiently determining if large rooms are sealed in a voxel-based 3D rooms. I'm at a point where I have tried my hardest to solve the problem without asking for help, but not tried enough to give up, so I'm asking for help. To clarify, sealed being that there are no holes in the room. There are oxygen sealers, which check if the room is sealed, and seal depending on the oxygen input level. Right now, this is how I'm doing it: Starting at the block above the sealer tile (the vent is on the sealer's top face), recursively loop through in all 6 adjacent directions If the adjacent tile is a full, non-vacuum tile, continue through the loop If the adjacent tile is not full, or is a vacuum tile, check if it's adjacent blocks are, recursively. Each time a tile is checked, decrement a counter If the count hits zero, if the last block is adjacent to a vacuum tile, return that the area is unsealed If the count hits zero and the last block is not a vacuum tile, or the recursive loop ends (no vacuum tiles left) before the counter is zero, the area is sealed If the area is not sealed, run the loop again with some changes: Checking adjacent blocks for "breathable air" tile instead of a vacuum tile Instead of using a decrementing counter, continue until no adjacent "breathable air" tiles are found. Once loop is finished, set each checked block to a vacuum tile. Here's the code I'm using: http://pastebin.com/NimyKncC The problem: I'm running this check every 3 seconds, sometimes a sealer will have to loop through hundreds of blocks, and a large world with many oxygen sealers, these multiple recursive loops every few seconds can be very hard on the CPU. I was wondering if anyone with more experience with optimization can give me a hand, or at least point me in the right direction. Thanks a bunch.

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• How to create one additional hidden partition in a USB drive

  - by backslash17

  For security purposes I need to locate a additional hidden partition on USB flash drive. The USB drive contains a security application that will check (in code) if the hidden partition exists. If not I will assume that the application is a non valid copy. Any idea about it? Thanks in advance. EDIT: There is already a programmed secure method to check if the USB drive is correct using the WMI Win32_drive class. The idea is to locate the drive info into the hidden partition and to check if it correct for anti-tampering procedures.

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• yum-updatesd problem

  - by smusumeche

  I am trying to setup yum-updatesd to send email notification when there are updates available to the packages on my system. However, I am not receiving any notifications even though there are updates available (as seen in yum check-update) I have verified that the yum-updatesd service is running. This is my /etc/yum/yum-updatesd.conf: [main] # how often to check for new updates (in seconds) run_interval = 3600 # how often to allow checking on request (in seconds) updaterefresh = 600 # how to send notifications (valid: dbus, email, syslog) emit_via = email email_to = [email protected] email_from = [email protected] # should we listen via dbus to give out update information/check for # new updates dbus_listener = yes # automatically install updates do_update = no # automatically download updates do_download = no # automatically download deps of updates do_download_deps = no

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• Testing the load factor in my lab

  - by Ami Winter

  I am a system admin in a lab, I have ~90 computers in the lab and I want to check the load factor on them.. meaning, to check how many people are working on the computers hourly.. To see if I need to buy more computers or not. I am looking for a way to build a script to check if a computer is logged on or not.. (0 for log off - 1 for log on) After I will have this data, I know how to build a script to build me the graphs. All the computers are linked via a domain and most of them have windows XP (few windows 7) I'll be happy to get some help. Amihay

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• How should I determine if a user is logged in graphically while lightdm is running?

  - by Jack

  I want to know if someone is logged into a local X-session. In the past I looked at the output of ck-list-sessions. The output looked something like this: Session12: unix-user = '[redacted]' realname = '[redacted]' seat = 'Seat1' session-type = '' active = TRUE x11-display = ':0' x11-display-device = '/dev/tty8' display-device = '' remote-host-name = '' is-local = TRUE on-since = '2012-10-22T18:17:55.553236Z' login-session-id = '4294967295' If no one was logged in, there was no output. I checked if someone was logged in with ck_result" string => execresult("/usr/bin/ck-list-sessions | /bin/grep x11 | /usr/bin/cut --delimiter=\\' -f 2 | /usr/bin/wc -w This no longer works, because lightdm greeter looks like a logged in user Session12: unix-user = '[redacted]' realname = 'Light Display Manager' seat = 'Seat1' session-type = 'LoginWindow' active = TRUE x11-display = ':0' x11-display-device = '/dev/tty8' display-device = '' remote-host-name = '' is-local = TRUE on-since = '2012-10-22T22:17:55.553236Z' login-session-id = '4294967295' I guess I could check session-type, but I don't know how to do that and check x11-display in one-liner. I then need to write my own script, but at that point I thought I would check if anyone else has already done the work or if there is a way to get ConsoleKit to tell me what I want (or if I should be using a different tool)?

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• BIG IP - HTTPS Health Monitor setup

  - by djo

  I have a Web site that we have setup a health monitoring pages so we can take our servers in and out of the Big-IP as we see fit. Now we have just moved onto Big-IP and the issue I have hit is that you setup Health Monitors for port 80 and 443, now the 80 check works fine but when I to get the 443 check to look at our file it fails. Now I am aware as I am hitting the this page on the IP address over HTTPS is going to cause a cert error but I would have guessed that BIG-Ip would have been setup just to accept the cert and carry on with the check. Is what I am wanting to do possible? Also is there a way of just using a HTTP monitor for HTTPS? Because if port 80 has stopped sending traffic then if i use the same monitor for 443 it will stop traffic to that. Any help would be great! Thanks

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• From which plex am I booted from on raid?

  - by rumburak

  I have a server with mirrored boot volume. It is software raid 1 in Windows Server 2008 R2. I do not have physical access to the server. I am looking for a way to check which disk is a boot drive. I need a way to check it from os. How can I do that ? EDIT: I know how to do that, but I dont think its proper way. From diskpart I can break mirror: select volume 0 break disk=0 And Windows will only allow me to do that on not current boot disk. I want to check which one is boot without breaking mirroring.

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• Installing Django on Windows

  - by Pranav

  Ever needed to install Django in a Microsoft Windows environment, here is a quick start guide to make that happen: Read through the official Django installation documentation, it might just save you a world of hut down the road. Download Python for your version of Windows. Install Python, my preference here is to put it into the Program Files folder under a folder named Python<Version> Add your chosen Python installation path into your Windows path environment variable. This is an optional step, however it allows you to just type python in the command line and have it fire up the Python interpreter. An easy way of adding it is going into Control Panel, System and into the Environment Variables section. Download Django, you can either download a compressed file or if you’re comfortable with using version control – check it out from the Django Subversion repository. Create a folder named django under your <Python installation directory>\Lib\site-packages\ folder. Using my example above that would have been C:\Program Files\Python25\Lib\site-packages\. If you chose to download the compressed file, open it and extract the contents of the django folder into your newly created folder. If you’d prefer to check it out from Subversion, the normal check out points are http://code.djangoproject.com/svn/django/trunk/ for the latest development copy or a named release which you’ll find under http://code.djangoproject.com/svn/django/tags/releases/. Done, you now have a working Django installation on Windows. At this point, it’d be pertinent to confirm that everything is working properly, which you can do by following the first Django tutorial. The tutorial will make mention of django-admin.py, which is a utility which offers some basic functionality to get you off the ground. The file is located in the bin folder under your Django installation directory. When you need to use it, you can either type in the full path to it or simply add that file path into your environment variables as well. Hope this helps!

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• 2D Tile Collision free movement

  - by andrepcg

  I'm coding a 3D game for a project using OpenGL and I'm trying to do tile collision on a surface. The surface plane is split into a grid of 64x64 pixels and I can simply check if the (x,y) tile is empty or not. Besides having a grid for collision, there's still free movement inside a tile. For each entity, in the end of the update function I simply increase the position by the velocity: pos.x += v.x; pos.y += v.y; I already have a collision grid created but my collide function is not great, i'm not sure how to handle it. I can check if the collision occurs but the way I handle is terrible. int leftTile = repelBox.x / grid->cellSize; int topTile = repelBox.y / grid->cellSize; int rightTile = (repelBox.x + repelBox.w) / grid->cellSize; int bottomTile = (repelBox.y + repelBox.h) / grid->cellSize; for (int y = topTile; y <= bottomTile; ++y) { for (int x = leftTile; x <= rightTile; ++x) { if (grid->getCell(x, y) == BLOCKED){ Rect colBox = grid->getCellRectXY(x, y); Rect xAxis = Rect(pos.x - 20 / 2.0f, pos.y - 20 / 4.0f, 20, 10); Rect yAxis = Rect(pos.x - 20 / 4.0f, pos.y - 20 / 2.0f, 10, 20); if (colBox.Intersects(xAxis)) v.x *= -1; if (colBox.Intersects(yAxis)) v.y *= -1; } } } If instead of reversing the direction I set it to false then when the entity tries to get away from the wall it's still intersecting the tile and gets stuck on that position. EDIT: I've worked with Flashpunk and it has a great function for movement and collision called moveBy. Are there any simplified implementations out there so I can check them out?

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• Javascript storing data

  - by user985482

  Hi I am a beginner web developer and am trying to build the interface of a simple e-commerce site as a personal project.The site has multiple pages with checkboxes.When someone checks an element it retrives the price of the element and stores it in a variable.But when I go to the next page and click on new checkboxes products the variable automaticly resets to its original state.How can I save the value of that variable in Javascript? This is the code I've writen using sessionStorage but it still dosen't work when I move to next page the value is reseted. How can I wright this code so that i dosen't reset on each page change.All pages on my website use the same script. $(document).ready(function(){ var total = 0; $('input.check').click(function(){ if($(this).attr('checked')){ var check = parseInt($(this).parent().children('span').text().substr(1 , 3)); total+=check; sessionStorage.var_name=0 + total; alert(sessionStorage.var_name); }else{ var uncheck = parseInt($(this).parent().children('span').text().substr(1 , 3)); total-=uncheck; } })

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• Putting a whole linux server under source control (git)

  - by Tobias Hertkorn

  I am thinking about putting my whole linux server under version control using git. The reason behind it being that that might be the easiest way to detect malicious modifications/rootkits. All I would naively think is necessary to check the integrity of the system: Mount the linux partition every week or so using a rescue system, check if the git repository is still untempered and then issue a git status to detect any changes made to the system. Apart from the obvious waste in disk space, are there any other negative side-effects? Is it a totally crazy idea? Is it even a secure way to check against rootkits since I most likely would have to at least exclude /dev and /proc ?

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• What happens when you close an Adsense account?

  - by rakibtg

  I need to change my payee name, I have asked in Google Adsense product forum one of top contributor replied me: "You will have to close the account & apply again with using your real payee name. That's why they specifically state that the payee name needs to match the full name on your bank account." https://support.google.com/adsense/answer/47333?hl=en This makes sense, but got few question because the support page do not have sufficient content to help me. My questions are: What happens when you close your Adsense account? If I apply again, then what will be the process to re-gain my account? I mean should I have to apply for a website again, then Adsense team will review and approve that? Is there any chance to disapprove my account? What about current check? I have two check in my hand. So, is Google will send those check again to me with my new payee name? Anyone experienced this problem? I have asked it on Google Forum but got no answer!

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• My Windows 7 computer won't boot up and a BSOD keeps coming up; how do I solve it?

  - by opj

  Whenever I boot my Windows 7 computer, I get a blue screen of death with the following details: A problem has been detected and windows has been shut down to prevent damage to your computer. If this is the first time you've seen this stop error screen, restart you computer. If this screen appears again, follow these steps: Check for viruses on your computer. Remove any newly installed hard drives or hard drive controllers. Check your hard drive to make sure it is properly configured and terminated. Run CHKDSK /F to check for hard drive corruption, and then restart your computer. Technical Information: * STOP: 0x0000007B (0xFFFFF880009A98E8,0xFFFFFFFFC000000D,0x0000000000000000,0x0000000000000000) What does this mean, and how can I fix it so I can boot my machine once again?

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• Integer type or not [closed]

  - by kira

  I am writing a program (in cpp) to check the primality of a given number The point where i am struck is , I need to check in between the program wether the value i obtained upon some arithmetic operations on the input is an integer or not i.e lets say input is 'a' I want to know how to check if 'b' is integer or not (FYI, b=(a+1)/6 ) My attempt for this : int main() { using std::cin; using std::cout; int b,c; int a; cout<<"enter the number"; cin>>a; b=(a+1)/6; c=(a-1)/6; if (b is an integer) cout << "The given number is prime"; else if (c is an integer) cin << "The given number is prime!"; else cout<<"The number is not prime"; return 0; }

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• How to work with processes?

  - by Viesturs

  I have seen similar questions here, but I didn't get my answer. Maybe it's because I am new to all this and just don't understand. I want my app to work mostly as an indicator. And if user would start it again it would check if it is already running, if it is then give all the input data to that process and quit. So first I need to check if it is running. I saw the answer where you can make a file witch when the program starts and then check if it exists... But what if someone would delete it? Can't I just ask the OS if there is process named "myApp" or something? The next thing I don't really get is how to communicate with the process. How do I give it the input data and what is it going to do with it? Does it work just like starting a new app, through the main() method? I am trying to create this using Quickly. So it would be nice if you can give me some python examples or link to something like that.

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• Can I share data between two users in an ASP.NET Application?

  - by Dave

  I have an issue with Roles.IsUserInRole function. It take hell amount of time to just check if the logged-in user is in particular role(typ 3-9 sec). I searched to find a solution and arrived on this but I am not sure If I have fully grasped it. What I got from the above, A new derived class is created. Inside that class, there is a list which retrieves all user at once. The next time you check IsUserInRole, you do not use the actual IsUserInRole method but rather use the one you overrode in your class. Is this the correct description? Am I on track? My question is, can data be share between two different users in ASP.NET application? If yes, will the shared data exist only if there is at least one user logged in. If all users logs out, that shared data is destroyed? My point is this data will be created only one time whenever a user logs in. For all subsequent users they can use this data and check their roles against the list? I need a detailed answer. My application has users and different roles. We are using ASP.NET roles.

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• Is it better to return NULL or empty values from functions/methods where the return value is not present?

  - by P B

  I am looking for a recommendation here. I am struggling with whether it is better to return NULL or an empty value from a method when the return value is not present or cannot be determined. Take the following two methods as an examples: string ReverseString(string stringToReverse) // takes a string and reverses it. Person FindPerson(int personID) // finds a Person with a matching personID. In ReverseString(), I would say return an empty string because the return type is string, so the caller is expecting that. Also, this way, the caller would not have to check to see if a NULL was returned. In FindPerson(), returning NULL seems like a better fit. Regardless of whether or not NULL or an empty Person Object (new Person()) is returned the caller is going to have to check to see if the Person Object is NULL or empty before doing anything to it (like calling UpdateName()). So why not just return NULL here and then the caller only has to check for NULL. Does anyone else struggle with this? Any help or insight is appreciated.

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• How to fix a Corrupted USB

  - by Help

  My USB stick has suddenly stopped working. It's a Busbi 4GB. My USB used to be G:/ but as soon as I plugged it in, I used to get a pop up box showing that it was plugged in. Now, when I plug this in, it shows as I:/ and no pop up box appears. It shows in my computer as I:/ and when I click to open it says I:/ is not accessible the disk structure is corrupted and unreadable. I have tried to change the file name back to G:/ but nothing happened (this was under disk management). On disk management, it shows Volume as I:/ Layout simple Type Basic File system RAW status Healthy (Active,Primary partition) Capacity 3.42GB. I've tried right clicking properties then the tab tools and click error checking (this option will check the volume for errors). When I click "check now" it comes up with the disk check could not be performed because Windows cannot access the disk.

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• sync two huge filesystems

  - by guettli

  I need to sync two huge file systems. Both sides run linux with full root access. My preferred solution: I can read the list of changed files and directories and sync only the changed files. Here are some solutions and why they don't fit: rsync: Needs to check recursively all files. There are some million files and only little changes. The check takes too long. unison: the same: needs to check all files. inotify: I need a handler for every directory and there too many. Inotify was not build for "watch all files" scenarios. DRDB: Both sides should run independent.

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