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• Traverse tree with results. Maybe type in Java?

  - by Angelo.Hannes

  I need to check a tree's node state. It can either be OK or NOT_OK. But that state is dependent on its children. So for a node to be OK, every of its children needs to be OK. If one or more of its children is NOT_OK the whole node is NOT_OK. To determine the state of a node I need to aggregate some properties of the node. So I thought of two possible implementations. And they are more or less covered in this question: Why is Option/Maybe considered a good idea and checked exceptions are not? Exception I could pass the properties up the recursion path, and throw an exception if something went wrong. Maybe I implement an Maybe type and let it either hold an error or the aggregated properties. Maybe it is more an Either. I tend towards the last option. And I'm thinking of an enum with two objects. Where I can additionally set those aggregated properties. Am I on the right track? I'm not familiar with the new JDK8 functional stuff. But I'm stuck on JDK7 anyway, so please focus on JDK7.

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• Setting up group disk quotas

  - by Ray

  I am hoping to get some advice in setting up disk quotas. So, I know about: Adding usrquota and grpquota on to /etc/fstab for the file systems that need to be managed. Using edquota to assign disk quotas to users. However, I need to do the last step for multiple users and edquota seems to be a bit troublesome. One solution that I have found is that I can do: sudo edquota -u foo -p bar. This will copy the disk quota of bar to user foo. I was wondering if this is the best solution? I tried setting up group disk quotas but they don't seem to be working. Are group quotas meant to help in the assignment of the same quota to multiple users? Or are they suppose to give a total limit to a set of users? For example, if users A, B, C are in group X then assigning a quota of 20 GB gives each user 20 GB or does it give 20 GB to the entire group X to divide up? I'm interested in doing the former, but not the latter. Right now, I've assigned group disk quotas and they aren't working. So, I guess it is due to my misunderstanding of group disk quotas... My problem is I want to easily give the same quota to multiple users; any suggestions on the best way to do this out of what I've tried above or anything else I may not have thought of? Thank you!

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• Did MS break IE with update on 2010-01-12?

  - by SpliFF

  I have 4 computers at 2 completely seperate clients that have all experienced the same problem on the same day. Internet Explorer 7 is returning "Page not Found" for all sites. The real kicker is that all other Internet works, including Firefox. At least one of the machines is Vista. Not sure on the other 3. At least 2 of the machines have no proxy server set so it isn't that. Did Microsoft push an automatic update that broke IE7 on Tuesday 2010-01-12? Has anyone else experienced this problem in the last week? This can't be a coincidence. Apart from being located in the same town and being supported by my company (we didn't change anything) these clients have nothing in common except they use Windows and they browse with IE. These machines probably share other traits, like having Spybot installed, however removing Spybot changed nothing. Also, of course i got them to reboot. Still broken.

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• SnapBird Supercharges Your Twitter Searches

  - by ETC

  Twitter’s default search tool is a bit anemic. If you want to supercharge your Twitter search, fire up web-based search tool SnapBird and dig into your past tweets as well as those of friends and followers. Yesterday I was trying to find a tweet I’d sent some time last year regarding my search for an application that could count keystrokes for inclusion in my review of the app I finally found to fulfill the need, KeyCounter. Searching for it with Twitter’s search tool yielded nothing. One simple search at SnapBird and I nailed it. SnapBird requires no authentication to search public tweets (both your own and those of your friends and follows) but does require authentication in order to search through your sent and received direct messages. SnapBird is a free service. SnapBird Latest Features How-To Geek ETC Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware How to Change the Default Application for Android Tasks Stop Believing TV’s Lies: The Real Truth About "Enhancing" Images The How-To Geek Valentine’s Day Gift Guide Inspire Geek Love with These Hilarious Geek Valentines MyPaint is an Open-Source Graphics App for Digital Painters Can the Birds and Pigs Really Be Friends in the End? [Angry Birds Video] Add the 2D Version of the New Unity Interface to Ubuntu 10.10 and 11.04 MightyMintyBoost Is a 3-in-1 Gadget Charger Watson Ties Against Human Jeopardy Opponents Peaceful Tropical Cavern Wallpaper

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• How to remove the dlinksearch browser search hijack

  - by Bish

  Hi Gang, For the last few weeks all the machines on my home network are having the same problem whilst browsing the internet. When the user enters an invalid URL in the browser address bar, instead of the default browser behaviour, the request is sent to http://www1.dlinksearch.com/. As far as I can tell this is all machines and all browsers. It is so consistent I am wondering whether it has anything to do with our router. We use a DLink DIR-655 router so maybe the clue is in the name :) Anyhow, I cannot figure out how to disable/remove the offending behaviour. I've checked hosts files, spyware, AV etc. etc. Anybody have any ideas? Paul P.S. Apologies if this is not the right place to ask this type of question. I'm a bit stuck

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• Minimum size of a boot partition on debian

  - by zebonaut

  I'm setting up an old box with Debian. First etch (4.0), because this is the last version that still had boot floppies, then the box is to be upgraded to lenny (5.0) and squeeze (6.0). Therefore, I will end up having a a couple of different kernel versions in the boot partition. If I don't want to be wasteful and if I end up needing a separate boot partition, how large should it be? I've used 10 MB long ago, but that was woody, and only one kernel in the boot partition, and this seems to be too small for what I want to do now.

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• Change Block Tracking settings not retained for a VM on VMWare 5.5

  - by Chris

  I'm trying to enable Change Block Tracking as per this VMWare KB article but the setting ctkEnabled is not being retained in the advanced options or being added to the vmx file. The setting scsi0:0.ctkEnabled is being retained and I see a file vmname-ctk.vmdk in the datastore. I've verified that the vm doesn't have any snapshots but don't see any other suggestions in the KB (or google, of course.) Edit: The last comment on this community post. It's a slightly different circumstance, but suggests that there is an known bug editing these settings in the web-gui.

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• How to fix out the error dpkg: error processing colord (--configure):

  - by ranjitpradhan

  I have upgrade my ubuntu from 11.10 to 12.04. at last i can found that when i tries to install some packages it shows a error. after reading some blog i tried to fix that error by "sudo dpkg --configure -a". but when i run this command it show another error this Setting up colord (0.1.16-2) ... useradd: cannot lock /etc/passwd; try again later. adduser: `/usr/sbin/useradd -d /var/lib/colord -g colord -s /bin/false -u 115 colord' returned error code 1. Exiting. dpkg: error processing colord (--configure): subprocess installed post-installation script returned error exit status 1 Setting up whoopsie (0.1.32) ... useradd: cannot lock /etc/passwd; try again later. adduser: `/usr/sbin/useradd -d /nonexistent -g whoopsie -s /bin/false -u 115 whoopsie' returned error code 1. Exiting. dpkg: error processing whoopsie (--configure): subprocess installed post-installation script returned error exit status 1 Setting up lightdm (1.2.1-0ubuntu1) ... Adding system user `lightdm' (UID 115) ... Adding new user `lightdm' (UID 115) with group `lightdm' ... useradd: cannot lock /etc/passwd; try again later. adduser: `/usr/sbin/useradd -d /var/lib/lightdm -g lightdm -s /bin/false -u 115 lightdm' returned error code 1. Exiting. dpkg: error processing lightdm (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of ubuntu-desktop: ubuntu-desktop depends on lightdm; however: Package lightdm is not configured yet. dpkg: error processing ubuntu-desktop (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: colord whoopsie lightdm ubuntu-desktop what can i do now ?

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• Tail-recursive implementation of take-while

  - by Giorgio

  I am trying to write a tail-recursive implementation of the function take-while in Scheme (but this exercise can be done in another language as well). My first attempt was (define (take-while p xs) (if (or (null? xs) (not (p (car xs)))) '() (cons (car xs) (take-while p (cdr xs))))) which works correctly but is not tail-recursive. My next attempt was (define (take-while-tr p xs) (let loop ((acc '()) (ys xs)) (if (or (null? ys) (not (p (car ys)))) (reverse acc) (loop (cons (car ys) acc) (cdr ys))))) which is tail recursive but needs a call to reverse as a last step in order to return the result list in the proper order. I cannot come up with a solution that is tail-recursive, does not use reverse, only uses lists as data structure (using a functional data structure like a Haskell's sequence which allows to append elements is not an option), has complexity linear in the size of the prefix, or at least does not have quadratic complexity (thanks to delnan for pointing this out). Is there an alternative solution satisfying all the properties above? My intuition tells me that it is impossible to accumulate the prefix of a list in a tail-recursive fashion while maintaining the original order between the elements (i.e. without the need of using reverse to adjust the result) but I am not able to prove this. Note The solution using reverse satisfies conditions 1, 3, 4.

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• Sweden Windows Azure Group Meeting in November &amp; Fast with Windows Azure Competition

  - by Alan Smith

  SWAG November Meeting There will be a Sweden Windows Azure Group (SWAG) meeting in Stockholm on Monday 19th November. Chris Klug will be presenting a session on Windows Azure Mobile Services, and I will be presenting a session on Web Site Authentication with Social Identity Providers. Active Solution have been kid enough to host the event, and will be providing food and refreshments. The registration link is here: http://swag14.eventbrite.com If you would like to join SWAG the link is here: http://swagmembership.eventbrite.com Fast with Windows Azure Competition I’ve entered a 3 minute video of rendering a 3D animation using 256 Windows Azure worker roles in the “Fast with Windows Azure” competition. It’s the last week of voting this week, it would be great if you can check out the video and vote for it if you like it. I have not driven a car for about 15 years, so if I win you can expect a hilarious summery of the track day in Vegas. My preparation for the day would be to play Project Gotham Racing for a weekend, and watch a lot of Top Gear.   My video is “Rapid Massive On-Demand Scalability Makes Me Fast!”. The link is here: http://www.meetwindowsazure.com/fast/

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• Ubuntu 11.04 hangs at "checking battery state" while booting

  - by MisterSir

  When I try to boot Ubuntu 11.04, it just hangs when it gets to checking battery state. I know this issue is usually related to graphic drivers, but it worked like a charm for months now. Last time I was on Ubuntu I updated my system with the update manager, so maybe an update caused it. Anyway, I really need Ubuntu. I'm in the middle of work on a website and I have a deadline, so I need some help over here. Thanks. p.s. I tried reinstalling gnome-power-manager. Didn't work. And I'm not on a laptop.

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• Where is he now?

  - by Chris G. Williams

  A couple months ago, I announced I was leaving Magenic in order to take a break from consulting. I figured I'd post an update as to what I'm doing now, since I haven't exactly been slacking off.1) I accepted a position as a Lead Developer with RealPage. I work on a number of internal use applications for a subsidiary known as LevelOne. The majority of my work is in ASP.NET, a surprising amount of VB.NET, some C# and I'm picking up a few new tools for my belt... specifically Python, MongoDB and Perl.2) I am still the owner of Big Robot Games, a retail game store / coffee shop in the South Carolina upstate region. I'm not as involved in the day to day activity as I was, but I'm there most nights and weekends, when I'm not off doing other things, like #3.3) I am on the staff of Rock Revolt Magazine as a journalist, covering live performances as well as interviewing bands, providing album & video game reviews, fixing the website and the occasional prison ink. (Just kidding on that last one.)4) In whatever time is leftover, I still manage to bang out a little code on Heroic Adventure! (aka HA!) and talk about Windows Phone, XNA and whatever else suits me, wherever they'll let me.I guess that's about it.

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• Bitlocker folder encryption

  - by Razor

  My situation I know that bitlocker is meant to encrypt whole drives, but I have an hard drive that is already fully partitioned and containing data. I'd like to encrypt part of one partition, leaving the rest of the partition accessible. I would very much like to avoid programs like Norton partition magic (which resize/split partitions), because every time I used them I had problems with the data stored. Question Is there any way/builtin alternative/3rd party app that integrates with windows login to encrypt one subset of a partition? EDIT I heard horror stories about EFS, which is why I don't want to use it. Some highlights from that article: In fact I’ve only used EFS twice in the last ten years on my own computers and on both occasions I’ve lost files and documents. I therefore cannot recommend you ever encrypt your files with this Windows feature. Unfortunately, because of incompatibilities with some differing versions of EFS files can end up scrambled and unrecoverable.

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• Homepage not showing on Google

  - by MIke Mayberry

  About six weeks ago my homepage (mayberrykayakingdotcodotuk) disappeared from the google organic search for "kayaking pembrokeshire" despite it having been number 2 within a few weeks of it's launch last summer. My previous site (www.mikemayberrykayakingdotcodotuk) had been 2nd for about six years and has 301 redirects for all pages to the new site. Google toolbar still rates the homepage as 3/10 and the domain is still showing in search results, just not the homepage. A little research suggests that this is most likely to be due to an issue with google treating two pages as identical content (one with www. and one with not) since the changes in their algorithms around that time and that the way to fix this is to add some code somewhere. This makes sense to me as my print advertising doesn't have the www part of the address. I have cpanel access but a limited knowledge on web coding, having picked things up as I've gone along and paid for designers etc., when needed. Would someone be able to let me know where I have to go to add the code and what code I need to add to redirect the crawlers to one page? Or is there another issue that is causing this? Thanks in advance.

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• Best way to update UI when dealing with data synchronization

  - by developerdoug

  I'm working on a bug at work. The app is written in Objective-C for iOS based device, for the iPad. I'm the new guy there and I've been given a hard task. Sometimes, the UIButton text property does not show the correct state when syncing. Basically, when the app is syncing, my UI control would say "Syncing" and when its not syncing it'll display "Updated @ [specific date]". Right now there is a property on the app delegate called "SyncInProgress". When querying / syncing, occurring on background thread, it updates a counter. The property will return a bool checking expression 'counter 0'. There are three states I need to deal with. Sync has started. Sync is updating tables. Sync finished. These items need to occur in order. My coworker suggested to take a state based approach instead of just responding to events. I'm not sure about how to go about that. Would it be best to have the UI receive a notification to determine what state its in or to pull every so often if state changed? Here are two posts that I put on stackoverflow, in the last few days, that relate to this. http://stackoverflow.com/questions/11025469/ios-syncing-using-a-state-approach-instead-of-just-reacting-to-events http://stackoverflow.com/questions/11037930/viewcontroller-when-viewwillappear-called-does-not-always-correctly-reflect-stat Any ideas that anyone might have to very much appreciated. Thanks, developerDoug

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• Why does my macbook pro keep freezing?

  - by mac

  Once in a while my macbook pro 10.8.2 freezes for a couple of seconds, this is really annoying. Mouse gets frozen, I can't move it, and screen gets frozen. These are the last messages from the kernel, how to solve this? Sandbox: sandboxd(38380) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38410) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38429) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38463) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38495) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38513) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38550) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38581) deny mach-lookup com.apple.coresymbolicationd Sandbox: sandboxd(38599) deny mach-lookup com.apple.coresymbolicationd CODE SIGNING: cs_invalid_page(0x1000): p=38605[GoogleSoftwareUp] clearing CS_VALID Sandbox: sandboxd(38632) deny mach-lookup com.apple.coresymbolicationd

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• Why can't I reconnect to my Philips SHB9000 bluetooth headset?

  - by Thomas Eyde

  When I connected my Philips SHB9000 bluetooth to my Windows 7 (64 bit) for the very first time, it worked well. I had to manually change the default playback device, but otherwise it worked. Then, when I start up my computer from standby, it's nearly random when I can reconnect or not. My last option is to remove the bluetooth device and reconnect it. But now, even that doesn't work. The sad thing is, this used to work better on Windows 7 beta. Windows Update has a new driver which fails to install. Searching for this driver yields nothing. I thought all vendors had an official site for their drivers? Well, Philips seems to have none. If there is no answer to this problem, my advice is to NOT buy this headset. It's good looking, the sound is nice, but what need do we have from that if we can't use the bloody device?

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• Windows server 2003 mapping home drive wrong

  - by Sandman2010

  hey all, first question... we have around 30 servers in an Active Directory environment with 600 student computers and 100 staff desktops with XP SP2/3, the win server 2003 has the staff home drives on a NAS and in the last few days after some server updates is now mapping home drives to the \servername\home instead of \severname\home\%username%, its simple to re map the network drive but is annoying. we dont use login script to map home drive but use a VB script for other network drives and if we add the home drive mapping to that it works, but shouldnt the profile option in users AD account map that correctly? which do you all recommend, AD profile mapping or VB Script mapping Home drives? thanks Steven

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• Need to use wusa to stop endless rebooting on R2

  - by Jack

  I installed 3 updates, which after rebooting resulted in a reboot loop, never going past the "configuring your computer for windows" stage. Last known good configuration, safe mode etc make no difference (as expected). I have no system restore images available. I used dism to uninstall one of the updates, but the other two appear to be MSP patches, and so I cannot use dism to uninstall them. From what I have been reading it appears I must use wusa, however wusa does not seem to be included in WinRE. Does anyone have a suggestion of how I can access wusa to uninstall these updates, and hopefully reverse this problem?

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• Packing up files on my machine, sending it to a server, and unpacking it

  - by MxyL

  I am implementing a feature in my application that sends all files in a specified folder to a server. I have the basic FTP transaction set up using Apache Commons FTPClient: it sets up a connection and transfers a file from one place to another. So I can simply loop over the directory and use this connection to transfer all the files. However, this could be better. Rather than transferring each file one by one, it makes more sense to pack it up in a compressed archive and then send the whole file at once. Saves time and bandwidth, since these are just text files so they compress nicely. So I would like to add automatic archive packing and unpacking. This is the workflow I have planned out, using zip compression: Zip all files in the folder Send the file over Unzip the files at its destination 1 and 2 are easy since the files are on the local machine, but I'm not sure how to accomplish the last step, when the files are now on a remote server. What are my options? I have control over what I can put and run on the server. Perhaps it is not necessary to do the packing/unpacking myself?

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• How to minimize services in ubuntu

  - by codeomnitrix

  Hello everyone.I am using ubuntu from last 6-7 months. I am having 512mb ram and a p4 processor with 1.73 Ghz processing speed. And being a programmer i have to work with eclipse and netbeans like ide's, and they sometimes hang. So is there any option in ubuntu to stop the services running just like i do have in windows "msconfig" or mycomputer-manage, and where could i find the details about the services so that i should know what will be its effect if i stop this service. I am using ubuntu 10.10 Thanks

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• aws s3 works with script but not on cron

  - by user3800017

  guys.. My first post ! hope not the last .. I have few bunch of servers on aws ec2 platforms. I made a simple script to backup my custom logs on their s3 storage bucket. The problem is the script works fine .. but I tried to add it to the crontab. And the script executes but not the s3 sync/mv part ! Here is my code: NOW=$(date "+%b_%d_%Y") MY_HOSTNAME=`uname -n` mv /opt/req/req* /opt/req/bkup/ mv /opt/response/res* /opt/req/bkup/ cd /opt/req/bkup/ tar -cvf ${MY_HOSTNAME}_req_bkup_${NOW}.tar re* rm *.txt aws s3 mv /opt/req/bkup/* s3://req `

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• Recommendation for a non-standard SSL port

  - by onurs

  Hey guys, On our server I have a single IP, and need to host 2 different SSL sites. Sites have different owners so have different SSL certificates, and can't share the same certificate with SAN. So as a last resort I have modified the web application to give the ability to use a specified port for secure pages. For its simple look I used port 200. However I'm worried about some visitors may be unable to see the site because of their firewalls / proxies blocking the port for ssl connections. I heard some people were unable to see the website, a home user and someone from an enterprise company, don't know if this was the reason. So, any recommendations for a non-standard SSL port number (443 is used by the other site) which may work for visitors better than port 200 ? Like 8080 or 8443 perhaps? Thanks!

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• tar incremental backup is backing everything up, every time

  - by Cyclic

  I made an incremental backup about 10 months ago (on Jan 27, 2013), creating a .snar metadata file. Now, when I try to make an incremental backup using tar --create --file=dropbox_incremental_1.tar --listed-incremental=dropbox_0.snar Dropbox the command just re-backs up everything. I'm not an expert at Unix timestamps, but I noticed that virtually all of my directory timestamps are way more recent than the last time they changed. For my actual files, they look like this: Access: 2013-03-12 19:04:51.000000000 -0500 Modify: 2012-09-30 15:10:47.000000000 -0500 Change: 2013-03-12 19:04:51.306209672 -0500 The 'Modify' timestamp seems correct, but the files were definitely not changed (at least not doing anything that I know of) at the time they say they were. These files still seem to go into the incremental archive. What's happening here? Is there a way to tell tar to look at the 'modify' timestamp? Isn't this what it's supposed to be doing?

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• Microsoft Outlook 2007 - General Failure. The URL was: "<http:/something.com>". The parameter is incorrect

  - by Simon Peverett

  For the last two days, Outlook has decided it doesn't like URL's. Any email message that comes in containing an URL will show the following in an error dialogue message box when I click on the link: General Failure. The URL was: "http:/something.com/somewhere/". The parameter is incorrect If I copy the link into a browser, it works correctly. OS is Windows XP SP 3, Microsoft Office 2007 (Outlook), Internet Explorer 8 (also Chrome). I have, of course, Googled this and the two most popular solutions are: Solution 1: Add/Remove programs Set Program Access and Defaults Custom tab Make sure a default browser is selected Solution 2: Add/Remove Programs Select the MS Office 2007 item Click Change Click Repair I have tried both of these and I still get the problem. Has anyone else had this problem and solved it with a solution other than those listed above?

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