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  • What does /dev/null mean in the shell?

    - by rishiag
    I've started learning bash scripting by using this guide: http://www.tldp.org/LDP/abs/abs-guide.pdf However I got stuck at the first script: cd /var/log cat /dev/null > messages cat /dev/null > wtmp echo "Log files cleaned up." What do lines 2 and 3 do in Ubuntu (I understand cat)? Is it only for other Linux distributions? After running this script as root, the output I get is Log files cleaned up. But /var/log still contains all the files.

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  • help bonding streaming rtp 3g

    - by enrique
    first sorry for contact me here. Recuro to you after reading all the material I found about it and so it does not get set. My question is: I can configure load balancing in any way out? I have a hub with 3 USB 3G modems, I got the 3 simultaneously connect with an upload speed of about 500kb in each approx. and a dynamic ip each. I do a unicast streaming with vlc rtp with a bandwidth of 1.5mb. Bone the sum of the three modems. I was searching on ifenslave, iproute. Then I found a draft vlc MultiCat. I understood that this could end, but configure it only moves a card. If I can help extend the information willingly. From now eternally grateful.

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  • How to choose which fields are available via LDAP from an Active Directory

    - by Felix Eve
    I'm using PHP to do an ldap search and then pull the attributes out using ldap_get_attributes. This returns an array of data (that can be seen here) however there are some fields that are missing such as Organization Title, department, company, address and telephone number. How to I make these fields available? There is a similar question here: http://www.petri.co.il/forums/showthread.php?t=15227 I've followed the steps outlined there an tried changing some access permissions but am not really sure what I'm doing and can't see any permissions that directly relate to the fields that I can see when I edit a user in the "Active Directory Users Computers" window. I am a PHP developer, not a Windows server administrator so am finding configuring an AD rather challenging so please don't assume any level of knowledge about AD. I've asked the same question on stack exchange but understand this is a more relevant place to ask.

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  • Why don't 8.04 panel launchers work on 10.04

    - by Android Eve
    I copied my panel launchers verbatim from 8.04 to 10.04, residing in both systems in the same path: $HOME/.gnome2/panel2.d/default/launchers However, for some reason, they are not visible on 10.04's GNOME panel. Why? In my attempts to troubleshoot the problem I: Verified that copied 8.04 launchers have same permissions as manually created 10.04 launchers (-rwxr-xr-x). Added the first line as: #!/usr/bin/env xdg-open Logged off, then logged on. Rebooted. None of the above helped. So the question remains: Why? And how do I make them work?

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  • wrong GNOME logo at startup after 12.04 upgrade

    - by swordfish
    I'm not too expert of Ubuntu, but after a quite painful upgrade to version 12.04 (from 11.10), which first required to reinstall wireless drivers in order to work properly, and after an update from the Update Manager that I ran soon after the upgrade, I have a very strange problem coming up: at login page, where you choose your user among the list of the available ones, I can also see the list of available IDEs (Gnome, Gnome classic, Unity, Unity 2d, etc) but the funny thing is that the classic "foot" logo normally associated to the GNOME selection has now disappeared, and instead the "gear" logo (the one normally related to Unity, is on the side of the "gnome" choice. Note that the foot logo remains associated to the Gnome Classic item, and that the "gear" logo is still associated to the various versions of Unity available. This is not serious, since I can still access my GNOME or Unity environment, but I wonder if I can fix this up.

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  • Trying to boot from usb

    - by iron
    I have similar issues but none with the 12.04 build. Im trying this on a dell d610 laptop with a bad hard drive and was told i could just directly boot from the usb drive. Im using an 8g usb drive and i have tried using the uui tool and get this message. SYSLINUX 4.06 EDD 4.06-pre1 Copyright (c) 1994-2011 H.Peter Anvinet al ERROR: No configuration file found No DEFAULT or UI configuration directive found! Then i tried using unetbootin and got the bootup screen with only the default option and it would say auto boot with a 10 sec countdown and start over again. I do have the boot sequence for usb first.

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  • Find out if there is a local user logged in when logging in over ssh

    - by sebastiangeiger
    I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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  • error 0x80070522. not able to create a file in c:\ directory

    - by Abbas
    Hello Everybody... "error 0x80070522. not able to create a file in c:\ directory" One of our customers has just found a problem when trying to create a file on the root of the C:\ Drive, on a Windows 7 Professional PC. I know they shouln't be keeping files here, but there is a valid reason in this case, so I've relaxed the security on the root of C:\ by giving the group 'users' modify permission. Before I relaxed the security, the user was receiving 'access denied', but now they are receiving the message: An unexpected error is keeping you from creating the file. If you continue to recieve this error, you can use the error code to search for help with this problem. Error 0x80070522: A required priviledge is not held by the client. Googling for this suggests that it is caused by UAC, but how can I get round this when the user doesn't have admin rights on their PC? So did you find a solution for this issue ?? Please its urgent to my accountant software..

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  • What top companies look for in an Interview?

    - by Geek
    Basically I am looking for what is it that you goof up and you are out from the remaining process ? Are elimination rounds a fair way to judge a person ? Anyone can have a bad hour :-( Should you code the best possible or should you get the Algorithm right ? I generally first code a workable solution and then work on it till a level I think it looks beautiful to me. Is this a wrong approach ? Recently I had a telephonic interview in which I was asked to write a variation of Level Order traversal in 20 minutes. I could get the Algorithm and working code in 20 minutes but couldn't get the Exception handling and the coding convention right, after which I didn't hear back from them :-( All the other questions in the interview went very well this was the only thing which was 'not upto the mark'. Needless to say I like the company and will apply again but want to get it right the next time :-) Please share your experiences and valuable suggestions.

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  • Run a command from Windows 7 Start Menu

    - by Abhijeet Patel
    I'm trying to run commands such as "cmd.exe", "appwiz.cpl" etc by typing it in the Search box of the Start Menu in Windows 7 (x86). I'm able to do this just fine in Vista. After typing in "cmd" I notice that I see a link to "Programs" in the start menu so it seems that "cmd" is being recognized but when I click on "Programs" link which is shown,I get the following message. "These files can't be opened. Your internet security settings prevented one or more files from being opened" P.S. - I'm not looking for enabling the "Run" command to show in the Start Menu Any help would be much appreciated

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  • Edit 100MB+ file

    - by Majid Fouladpour
    I have captured some traffic with Wireshark and saved the result as a file. The file has 3 sections now: request headers response headers response body The response body is to become an flv file, but now everything is saved as a single file. So I need a way to delete the first two sections from the file, but the problem is that the file is very big (over a thousand mega bytes). I have tried to open it with gedit, but no matter how long I wait, gedit hangs and remains unresponsive until I kill it. What tool can I use to edit this big file easily?

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  • The new Google Analytics - what new useful features have you found?

    - by Rob
    If you don't know already a new version of Google Analytics has just come out. On first initial views it doesn't seem like much of an improvement on the previous version. There's lot's linking to Google's social stats but I'm yet to see the value of that. Also it doesn't seem to make the best use of the important data, it's tending to push referral sites, keywords to the back and bring the less important data to the front. Is that a sign of things to come??? One feature I did find interesting was the visitors flow as it shows the visitors path through your site. What new features have you found useful/interesting?

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  • Cocos2d update leaking memory

    - by Andrey Chernukha
    I have a weird issue - my app is leaking memory on device only, not on a simulator. It is leaking if i schedule update method anywhere, on any scene. It is leaking despite update method is empty, there's nothing inside it except NSLog. How can it be? I have even scheduled update on the very first scene where it seems there's nothing to leak, and scheduled another empty and it's leaking or not leaking but allocating something, the result is the same - the volume of the memory consumed is increasing and my app is crashing soon. I can detect the leakage via using Instruments-Memory-Activity Monitor or with help of following function: void report_memory(void) { struct task_basic_info info; mach_msg_type_number_t size = sizeof(info); kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &size); if( kerr == KERN_SUCCESS ) { NSLog(@"Memory in use (in bytes): %u", info.resident_size); } else { NSLog(@"Error with task_info(): %s", mach_error_string(kerr)); } } Can anyone explain me what's going on?

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  • Where is the UIM notification area icon in Unity?

    - by James
    When I was using Maverick, it was possible to switch the input method from a UIM indicator applet. Now that I have upgraded to Oneiric, I can't seem to switch the input method even when I open uim-im-switcher-gtk. This is necessary for me because I need to be able to switch back and forth between English and Tibetan and the keyboard shortcuts don't seem to work until after I've changed the input method from the panel first. Is there some way to get a UIM indicator on the Unity panel? This is a major regression for me and makes it impossible to do certain kinds of work in Ubuntu.

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  • Dynamic model interactions

    - by Richard
    I am just curious as to how in many games (namely games like arkham asylum/city, manhunt, hitman) do they make it so that your character can "grab" a character in front of you and do stuff to them. I know this may sound very confusing but for an example go to youtube and search "hitman executions", and the first video is an example of what i'm asking. Basically I'm wondering how they make your model dynamically interact with whatever other model you come across, so in hitman when you come up behind some one with the fibre wire you strangle the other character or if you have the anesthetic you come up behind some person and put your hand over there mouth while they struggle and slowly go to the floor where you lay them down. I am confused as to whether it was animated to use two models using specific bone/skeletal identifiers, if it is just two completely separate animations that are played at the correct time to make it look like they are actually interacting or something else all together. I am not an animator so i assume most of what i just said is not right but i hope that some one can understand what i mean and provide an answer. PS) I am a programmer and I am in the process of building a hitmanesque game, just because i love that style of game and I want to increase my skills on something fun, so if you do know what i'm talking about have some examples with involving both models and programming (i use c++ and mainly Ogre3D at the moment but i am getting into unity and XNA) i would greatly appreciate it. Thanks.

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  • Reminder: Oracle Solaris 11 Beta Exam Ending Soon!

    - by Paul Sorensen
    Just a quick reminder that the beta exam for the new "Oracle Certified Associate, Oracle Solaris 11 System Administrator" certification will be ending on April 28th. I'd like to invite anyone that has held off on becoming certified to consider taking beta exam. Participating in our Oracle's certification beta exams is a very inexpensive way to get certified, and you can be one of the first few people to become certified on Oracle Solaris 11. Please note that in order to earn your Oracle Solaris 11 OCA you are not required to attend a course from Oracle (of course you pass the test).Quick Links: Beta Exam: Oracle Solaris 11 System Administration (1Z1-821) Certification Track: Oracle Certified Associate, Oracle Solaris 11 System Administrator Certification Website: About Beta Exams Register Now: Pearson VUE

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  • Why are interfaces useful?

    - by Pankaj Upadhyay
    I have been studying and coding in C# for some time now. But still, I can't figure the usefulness of Interfaces. They bring too little to the table. Other than providing the signatures of function, they do nothing. If I can remember the names and signature of the functions which are needed to be implemented, there is no need for them. They are there just to make sure that the said functions(in the interface) are implemented in the inheriting class. C# is a great language, but sometimes it gives you the feeling that first Microsoft creates the problem (not allowing multiple inheritance) and then provides the solution, which is rather a tedious one. That's my understanding which is based on limited coding experience. What's your take on interfaces? How often you make uses of them and what makes you do so?

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  • Smarty: Tags Matching and Unpaired Tags Errors

    - by Martin Fousek
    Hello, today we would like to show you other improvements we have prepared in PHP Smarty Framework. Let's talk about highlighting of matching tags and error reporting of unpaired ones. Tags Matching Some of your enhancements talked  about paired tags matching to be able to see matching tags at first glance.We have good news for you that this feature you can try out already in our latest PHP Development builds and of course later in NetBeans 7.3. Unpaired Tags Errors To make easier detecting of template syntax issues, we provide basic tags pairing. If you forgot to begin some paired Smarty tag or you end it unexpectedly you should get error hint which complains about your issue. That's all for today. As always, please test it and report all the issues or enhancements you find in NetBeans BugZilla (component php, subcomponent Smarty).

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  • Algorithms for rainfall + river creation in procedurally generated terrain

    - by Peck
    I've recently become fascinated by the things that can be done with procedurally terrain and have started experimenting with world building a bit. I'd like to be able to make worlds something like Dwarf fortress with biomes created from meshing together various maps. So first step has been done. Using the diamond-square algorithm I've created some nice hieghtmaps. Next step is I would like to add some water features and have them somewhat realistically generated with rainfall. I've read about a few different approaches such as starting at the high points of the map, and "stepping" down to the lowest neighboring point, pooling/eroding as it works its way down to sea level. Are there any documented algorithms with this or are they more off the cuff? Would love any advice/thoughts.

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  • Windows Phone 8 Announcement

    - by Tim Murphy
    As if the Surface announcement on Monday wasn’t exciting enough, today Microsoft announce that Windows Phone 8 will be coming this fall.  That itself is great news, but the features coming were like confetti flying in all different directions.  Given this speed I couldn’t capture every feature they covered.  A summary of what I did capture is listed below starting with their eight main features. Common Core The first thing that they covered is that Windows Phone 8 will share a core OS with Windows 8.  It will also run natively on multiple cores.  They mentioned that they have run it on up to 64 cores to this point.  The phones as you might expect will at least start as dual core.  If you remember there were metrics saying that Windows Phone 7 performed operations faster on a single core than other platforms did with dual cores.  The metrics they showed here indicate that Windows Phone 8 runs faster on comparable dual core hardware than other platforms. New Screen Resolutions Screen resolution has never been an issue for me, but it has been a criticism of Windows Phone 7 in the media.  Windows Phone 8 will supports three screen resolutions: WVGA 800 x 480, WXGA 1280 x 768, and 720 1280x720.  Hopefully this makes pixel counters a little happier. MicroSD Support This was one of my pet peeves when I got my Samsung Focus. With Windows Phone 8 the operating system will support adding MicroSD cards after initial setup.  Of course this is dependent on the hardware company on implementing it, but I think we have seen that even feature phone manufacturers have not had a problem supporting this in the past. NFC NFC has been an anticipated feature for some time.  What Microsoft showed today included the fact that they didn’t just want it to be for the phone.  There is cross platform NFC functionality between Windows Phone 8 and Windows 8.  The demos , while possibly a bit fanciful, showed would could be achieved even in a retail environment.  We are getting closer and closer to a Minority Report world with these technologies. Wallet Windows Phone 8 isn’t the first platform to have a wallet concept.  What they have done to differentiate themselves is to make it sot that it is not dependent on a SIM type chip like other platforms.  They have also expanded the concept beyond just banks to other types of credits such as airline miles. Nokia Mapping People have been envious of the Lumia phones having the Nokia mapping software.  Now all Windows Phone 8 devices will use NavTeq data and will have the capability to run in an offline fashion.  This is a major step forward from the Bing “touch for the next turn” maps. IT Administration The lack of features for enterprise administration and deployment was a complaint even before the Windows Phone 7 was released.  With the Windows Phone 8 release such features as Bitlocker and Secure boot will be baked into the OS. We will also have the ability to privately sign and distribute applications. Changing Start Screen Joe Belfiore made a big deal about this aspect of the new release.  Users will have more color themes available to them and the live tiles will be highly customizable. You will have the ability to resize and organize the tiles in a more dynamic way.  This allows for less important tiles or ones with less information to be made smaller.  And There Is More So what other tidbits came out of the presentation?  Later this summer the API for WP8 will be available.  There will be developer events coming to a city near you.  Another announcement of interest to developers is the ability to write applications at a native code level.  This is a boon for game developers and those who need highly efficient applications. As a topper on the cake there was mention of in app payment. On the consumer side we also found out that all updates will be available over the air.  Along with this came the fact that Microsoft will support all devices with updates for at least 18 month and you will be able to subscribe for early updates.  Update coming for Windows Phone 7.5 customers to WP7.8.  The main enhancement will be the new live tile features.  The big bonus is that the update will bypass the carriers.  I would assume though that you will be brought up to date with all previous patches that your carrier may not have released. There is so much more, but that is enough for one post.  Needless to say, EXCITING! del.icio.us Tags: Windows Phone 8,WP8,Windows Phone 7,WP7,Announcements,Microsoft

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  • samba - join domain - automatically set workgroup

    - by ftiaronsem
    Hell alltogether Since I have to do this often, I want to automate the joining to a windows domain as much as possible. While joining a domain one has to specify realm = in the /etc/smb.conf, along with some other settings like security=ads. Among these settingst there is workgroup = My question is: Is it possible to fill this field automatically by samba, while joining a domain? Normally I would just have said never, but as I tried leaving this field blank while joining a domain, i got: Failed to join domain: Invalid configuration ("workgroup" set to '', should be 'BLABLA') and configuration modification was not requested This has made me wondering whether an automatic modification is possible and if so how? A search on the internet and the man page brought no results. It would be really great, if someone could answer that. Thanks in advance ftiaronsem

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  • FFMPEG not extracting part of the video

    - by DNA
    I used FFMPEG to extract portion (5 seconds) of a video like this: ffmpeg -ss 00:30:00 -t 00:00:05 -i original.avi cut1.avi and also like this: ffmpeg -ss 1800 -t 5 -i original.avi cut1.avi But what FFMPEG did was create a file starting at 00:30:00 and included the rest of the file instead of just 5 seconds. So instead of having a 5 second video clip, I now have the whole file except the first 30 minutes. What went wrong? I tried this with mencoder as well -- same result. EDIT 1 Strangely, this worked on OS X....

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  • Is there a LOGO interpreter that actually has a turtle?

    - by Tim Post
    This is not a repeat of the now infamous "How do I move the turtle in LOGO?" Recently, I had the following conversation with my five year old daughter: Daughter: Daddy, do you write programs? Me: Yes! Daughter: Daddy, what's a program? Me: A program is a set of instructions that a computer follows. Daughter: Daddy, can I write a program too? Me: Sure! This got me scrambling to think of a very basic language that a five year old could get some satisfaction from mastering rather quickly. I'm ashamed to admit that the first thing that came to mind was this: 10 INPUT "Tell me a secret" A$ 20 PRINT "Wow really? :" A$ 30 GOTO 10 That isn't going to hold a five year old's attention for very long and it requires too much of a lecture. However, moving a turtle around and drawing neat pictures might just work. Sadly, my search for a LOGO interpreter yielded noting but ad ridden sites, flight simulators and a whole bunch of other stuff that I really don't want. I'm hoping to find a cross platform (Java / Python) LOGO interpreter (dare I call it simulator?) with the following features: Can save / replay commands (stored programs) Has an actual turtle Sound effects are a plus Have you stumbled across something like this, if so, can you provide a link? I hate to ask a 'shopping' sort of question, but it seemed much better than "Is LOGO appropriate for a five year old?"

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  • Why is my metro screen getting extended to half of the second screen?

    - by maximusyoda
    When I extend my desktop to the second screen, it stays fine for a few minutes, but after a while, the first metro screen stretches all the way to half of the second screen. The search bar etc stops working. The desktop itself shares fine. But the metro screen is messed up as well as the resolution. The second screen is using the recommended resolution. All I want is to have an extended screen. The problem occurs in my office Windows 8 laptop as well. Not sure what to do with it. Device: Surface Pro 2 External Monitor: Dell 2208WFP 1680 x 1050 Pixel Resoultion 22''

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  • Oracle Tutor - Is Anyone Reading Your Documentation?

    - by mary.keane
    If you are responsible for documenting your business practices, wouldn't it be nice to know if anyone is using the documentation? If the employees find it useful? You might want to consider surveying the users of the documentation on a regular basis. There are a number of free survey tools online (search for "free survey tools"), and you can have a survey ready in a matter of minutes. It's as simple as gathering a list of questions and a list of email addresses. For the questions, here are some suggestions. How often do you access the policy and procedure site? How useful is the site? How easy is it to navigate the site? How often are your questions answered on the site? What suggestions do you have to make the site more useful? You may want to consider just asking a few questions each month so that employees can complete the survey in less than 5 minutes (you'll get more responses). Make sure you have several comment boxes in the survey so that the employees can give suggestions. As the users of your documentation, the employees may have some terrific ideas that will enhance the usability of your policy and procedure site. It would be great to hear your suggestions for how to survey the users of your documentation. Mary R. Keane Senior Development Manager, Oracle BPM and Tutor

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