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• Automatically kill a process if it exceeds a given amount of RAM

  - by chrisamiller

  I work on large-scale datasets. When testing new software, a script will sometimes sneak up on me, quickly grab all available RAM, and render my desktop unusable. I'd like a way to set a RAM limit for a process so that if it exceeds that amount, it will be killed automatically. A language-specific solution probably won't work, as I use all sorts of different tools (R, Perl, Python, Bash, etc). So is there some sort of process-monitor that will let me set a threshold amount of RAM and automatically kill a process if it uses more?

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• Allow any arguments for a given command with sudo

  - by Mark L

  I have the following sudo config entry which I added via sudo visudo: mark ALL = NOPASSWD: /usr/bin/lxc-ls* I can run lxc-ls with my user fine but I can't append any parameters without it demanding I prefix the command with sudo. $ whoami mark $ lxc-ls test-container $ lxc-ls --fancy lxc-ls: error: You must be root to access advanced container properties. Try running: sudo /usr/bin/lxc-ls Any idea how I can edit via sudo visudo to allow for any argument after the command? I don't want to prefix the command with sudo as I'm using a python library to execute the command and it's being funny about sudo prefixes.

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• Calculating WPM given a variable stream of input

  - by Jaxo

  I'm creating an application that sits in the background and records all key presses (currently this is done and working; an event is fired every keydown/keyup). I want to offer a feature for the user that will show them their WPM over the entire session the program has been running for. This would be easy if I added a "Start" and "End" button to activate a timer, but I need to detect only when the user is typing continuously - ignoring all one-time keyboard shortcuts and breaks the user takes from typing. How in the world do I approach this? Is this even realistically & accurately possible?

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• users disappear from options menu when given uids under 1000

  - by Seamus

  I wanted to stop particular user names appearing in the list of names at the log in screen. I remembered reading that this could be achieved by changing the user id of the account to something less than 1000 (I think I made it 990). So I did this. That worked fine, but now when I wanted to change it back, the name is not appearing in the list of user accounts in the users and groups menu under administration. How do I modify the phantom account?

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• How to get xy coordinates along a given path

  - by netbrain

  Say i have two points (x,y), (0,0) and (10,10). Now i wan´t to get coordinates along the line by stepping through values of x and y. I thought i solved it with the following functions: fy = startY + (x - startX) * ((destY-startY)/(destX-startX)); fx = (y + startY) / ((destY-startY)/(destX-startX)) + startX; taken from http://en.wikipedia.org/wiki/Linear_interpolation However, it seems that im getting a problem when destX and startX is the same value, so you get division by zero. Is there a better way of getting coordinates along a line when knowing the start and endpoint of the line?

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• Cloning from a given point in the snapshot tree

  - by Fat Bloke

  Although we have just released VirtualBox 4.3, this quick blog entry is about a longer standing ability of VirtualBox when it comes to Snapshots and Cloning, and was prompted by a question posed internally, here in Oracle: "Is there a way I can create a new VM from a point in my snapshot tree?". Here's the scenario: Let's say you have your favourite work VM which is Oracle Linux based and as you installed different packages, such as database, middleware, and the apps, you took snapshots at each point like this: But you then need to create a new VM for some other testing or to share with a colleague who will be using the same Linux and Database layers but may want to reconfigure the Middleware tier, and may want to install his own Apps. All you have to do is right click on the snapshot that you're happy with and clone: Give the VM that you are about to create a name, and if you plan to use it on the same host machine as the original VM, it's a good idea to "Reinitialize the MAC address" so there's no clash on the same network: Now choose the Clone type. If you plan to use this new VM on the same host as the original, you can use Linked Cloning else choose Full.  At this point you now have a choice about what to do about your snapshot tree. In our example, we're happy with the Linux and Database layers, but we may want to allow our colleague to change the upper tiers, with the option of reverting back to our known-good state, so we'll retain the snapshot data in the new VM from this point on: The cloning process then chugs along and may take a while if you chose a Full Clone: Finally, the newly cloned VM is ready with the subset of the Snapshot tree that we wanted to retain: Pretty powerful, and very useful.  Cheers, -FB 

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• Placing advice on any parameter of a given type in AspectJ

  - by user12558

  Hi, Im doing a POC using Aspectj. class BaseInfo{..} class UserInfo extends BaseInfo{..} class UserService { public void getUser(UserInfo userInfo){..} public void deleteUser(String userId){..} } I've defined an advice, that gets invoked when I pass an UserInfo instance.But when i try to pass the BaseInfo, the advice is not getting invoked. Below block executes the afterMethod as expected for getUser. &ltaop:pointcut id="aopafterMethod" expression="execution(* UserService.*(..,UserInfo,..))" / &gtaop:after pointcut-ref="aopafterMethod" method="afterMethod" / But when i try to give BaseInfo instead of UserInfo, the aspect is not getting triggered. Am i missing something? Kindly help me on this issue.

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• Given an integer, determine if it is a Palindrome in less than O(n) [on hold]

  - by user134235

  There is an O(n) solution to the problem of determining if an integer is a palindrome below. Is it possible to solve this problem in O(log n) or better? static void IsPalindrome(int Number) { int OrignalNum = Number; int Reverse = 0; int Remainder = 0; if (Number > 0) { while (Number > 0) { Remainder = Number % 10; Reverse = Reverse * 10 + Remainder; Number = Number / 10; } if (OrignalNum == Reverse) Console.WriteLine("It is a Palindrome"); else Console.WriteLine("It is not a Palindrome"); } else Console.WriteLine("Enter Number Again"); }

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• Rotate an object given only by its points?

  - by d33tah

  I was recently writing a simple 3D maze FPP game. Once I was done fiddling with planes in OpenGL, I wanted to add support for importing Blender objects. The approach I used was triangulization of the object, then using Three.js to export the points to plaintext and then parsing the result JSON in my app. The example file can be seen here: https://github.com/d33tah/tinyfpp/blob/master/Data/Models/cross.txt The numbers represent x,y,z,u,v of a single vertex, which combined in three make a triangle. Then I rendered such an object triangle-by-triangle and played with it. I could move it back and forth and sideways, but I still have no idea how to rotate it by some axis. Let's say I'd like to rotate all the points by five degrees to the left, how would a code doing it look like?

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• Use a Trendline Formula to Get Values for Any Given X with Excel

  - by kirkouimet

  Is there an easy way to apply the trend line formula from a chart to any given X value in Excel? For example, I want to get the Y value for a given X = $2,006.00. I've already taken the formula and retyped it out be: =-0.000000000008*X^3 - 0.00000001*X^2 + 0.0003*X - 0.0029 I am continually making adjustments to the trend line by adding more data, and don't want to retype out the formula every time.

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• Finding a prime number after a given number

  - by avd

  How can I find the least prime number greater than a given number? For example, given 4, I need 5; given 7, I need 11. I would like to know some ideas on best algorithms to do this. One method that I thought of was generate primes numbers through the Sieve of Eratosthenes, and then find the prime after the given number.

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• Ninject Given Path's format is not supported

  - by David Osborn

  The Ninject initialization works fine when i run my application directly from VS2010, but if I deploy the application to our custom "plugin" environment I get this error when I run the app and it tries to initialize Ninject. Error during initialization The given path's format is not supported. ERROR : The given path's format is not supported. Type : NotSupportedException Location: System.String CanonicalizePath(System.String, Boolean) Stack Trace: at System.Security.Util.StringExpressionSet.CanonicalizePath(String path, Boolean needFullPath) at System.Security.Util.StringExpressionSet.CreateListFromExpressions(String[] str, Boolean needFullPath) at System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList) at System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String[] pathList, Boolean checkForDuplicates, Boolean needFullPath) at System.IO.Path.GetFullPath(String path) at Ninject.Modules.ModuleLoader.NormalizePath(String path) at Ninject.Modules.ModuleLoader.GetFilesMatchingPattern(String pattern) at Ninject.Modules.ModuleLoader.b_0(String pattern) at System.Linq.Enumerable.d_142.MoveNext() at System.Linq.Lookup2.Create[TSource](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) at System.Linq.GroupedEnumerable3.GetEnumerator() at Ninject.Modules.ModuleLoader.LoadModules(IEnumerable1 patterns) at Ninject.KernelBase.Load(IEnumerable`1 filePatterns) at Ninject.KernelBase..ctor(IComponentContainer components, INinjectSettings settings, INinjectModule[] modules) at Ninject.KernelBase..ctor(INinjectModule[] modules) at MyApp.Ioc.ResolveType.Initialize() at MyApp.Program.Run()

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• List of resources for database continuous integration

  - by David Atkinson

  Because there is so little information on database continuous integration out in the wild, I've taken it upon myself to aggregate as much as possible and post the links to this blog. Because it's my area of expertise, this will focus on SQL Server and Red Gate tooling, although I am keen to include any quality articles that discuss the topic in general terms. Please let me know if you find a resource that I haven't listed! General database Continuous Integration · What is Database Continuous Integration? (David Atkinson) · Continuous Integration for SQL Server Databases (Troy Hunt) · Installing NAnt to drive database continuous integration (David Atkinson) · Continuous Integration Tip #3 - Version your Databases as part of your automated build (Doug Rathbone) · How the "migrations" approach makes database continuous integration possible (David Atkinson) · Continuous Integration for the Database (Keith Bloom) Setting up Continuous Integration with Red Gate tools · Continuous integration for databases using Red Gate tools - A technical overview (White Paper, Roger Hart and David Atkinson) · Continuous integration for databases using Red Gate SQL tools (Product pages) · Database continuous integration step by step (David Atkinson) · Database Continuous Integration with Red Gate Tools (video, David Atkinson) · Database schema synchronisation with RedGate (Vincent Brouillet) · Database continuous integration and deployment with Red Gate tools (David Duffett) · Automated database releases with TeamCity and Red Gate (Troy Hunt) · How to build a database from source control (David Atkinson) · Continuous Integration Automated Database Update Process (Lance Lyons) Other · Evolutionary Database Design (Martin Fowler) · Recipes for Continuous Database Integration: Evolutionary Database Development (book, Pramod J Sadalage) · Recipes for Continuous Database Integration (book, Pramod Sadalage) · The Red Gate Guide to SQL Server Team-based Development (book, Phil Factor, Grant Fritchey, Alex Kuznetsov, Mladen Prajdic) · Using SQL Test Database Unit Testing with TeamCity Continuous Integration (Dave Green) · Continuous Database Integration (covers MySQL, Perason Education) Technorati Tags: SQL Server,Continous Integration

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• given the html content, find out the height of the page for the given width,before rending the page.

  - by ganapati hegde

  Hi, i am interested in finding out the height for a given width,taken by the webpage for the given HTML content. Ex.say given html content is, < html < body < h6My First Heading< /h6 < pMy first paragraph.... ... ....< /p < /body < /html ======================================== How can i find out the height the webpage(corresponding to the given content), for a given width ? i want to calculate the height before loading the webpage... i.e i dont render the page, but using the "contents" only,i want to calculate the height...

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• Limit vsftp upload to a given set of file-names

  - by Chen Levy

  I need to configure an anonymous ftp with upload. Given this requirement I try to lock this server down to the bear minimum. One of the restrictions I wish to impose is to enable the upload of only a given set of file-names. I tried to disallow write permission to the upload folder, and put in it some empty files with write permission: /var/ftp/ [root.root] [drwxr-xr-x] |-- upload/ [root.root] [drwxr-xr-x] | |-- upfile1 [ftp.ftp] [--w-------] | `-- upfile2 [ftp.ftp] [--w-------] `-- download/ [root.root] [drwxr-xr-x] `-- ... But this approach didn't work because when I tried to upload upfile1, it tried to delete and create a new file in its' place, and there is no permissions for that. Is there a way to make this work, or perhaps use a different approach like abusing the deny_file option?

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• Interview de David Booth et Jevgeni Kabanov de la société ZeroTurnaround au sujet de JRebel, leur ou

  Bonjour, David et Jevgueni, de la société ZeroTurnaround, éditeur de l'outil de productivité JRebel pour le développement Java, ont accepté de répondre à nos questions sur leur société et leur produit phare. Retrouvez l'interview en ligne : http://java.developpez.com/interview...around/jrebel/ Y-a-t'il d'autres questions que vous auriez aimé soumettre à ZeroTurnaround ? Voir aussi : ZeroTurnaroun...

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• Limit vsftpd upload to a given set of file-names

  - by Chen Levy

  I need to configure an anonymous ftp with upload. Given this requirement I try to lock this server down to the bear minimum. One of the restrictions I wish to impose is to enable the upload of only a given set of file-names. I tried to disallow write permission to the upload folder, and put in it some empty files with write permission: /var/ftp/ [root.root] [drwxr-xr-x] |-- upload/ [root.root] [drwxr-xr-x] | |-- upfile1 [ftp.ftp] [--w-------] | `-- upfile2 [ftp.ftp] [--w-------] `-- download/ [root.root] [drwxr-xr-x] `-- ... But this approach didn't work because when I tried to upload upfile1, it tried to delete and create a new file in its' place, and there is no permissions for that. Is there a way to make this work, or perhaps use a different approach like abusing the deny_file option?

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• Tool for automatic start from standby / sleep mode at a given time

  - by hstoerr

  Is there a Windows-tool that is able to automatically revive the computer from standby / sleep mode at a given time?

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• find files their name is smaller or greater than a given parameter

  - by Tzury Bar Yochay

  Say that in a given directory I got tzury@x200:~/Desktop/sandbox$ ls -l total 20 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N00.P000 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N00.P001 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N00.P002 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N00.P003 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N00.P004 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N01.P000 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N01.P001 drwxr-xr-x 2 tzury tzury 4096 2011-03-09 10:19 N01.P002 I seek for a bash way to grab the list of files which their name is either grater or smaller than a given parameter, for instance: $ my_finder lt N00.P003 shall return N00.P000, N00.P001 and N00.P002 $ my_finder gt N00.P003 shall return N00.P004, N01.P000, N01.P001 and N01.P002 I was thinking of iterating over for name in $(ls) and while $name != $2 but believe there are more elegant way of doing so

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• Flex: Get an item from a AdvancedDataGrid given an index

  - by David Wolever

  I've got a subclass of AdvancedDataGrid showing a tree-like data structure. How can I, given the index returned by calculateDropIndex, get the item at that index? After reading through reams of code, it seems like the least terrible way is: var oldSelectedIndex:int = this.selectedIndex; var mouseOverIndex:int = this.calculateDropIndex(event); this.selectedItem = mouseOverIndex; var item:* = this.selectedItem; this.selectedIndex = oldSelectedIndex; The other option seems to be tinkering around with the iterator property... But, judging by the way I've seen it used, that will get pretty harry pretty quickly too. So, how can I get the item at a particular index in an advanced datagrid without going insane?

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• Get the date of a given day in a given week...

  - by Sean.C

  i need to start at a year-month and work out what the date it is in a given week, on a given day within that week.. i.e year: 2009 month: 10 week: 5 day-number: 0 would return 2009-10-25 00:00:00 which is a sunday. Notice week 5, there is no day 0 in week 5 in 2009-10 as the sunday in that logical week is 2009-11-01 00:00:00... so week 5 would always return the last possible date for the given day in the given month.. if you havn't guessed already i'm messing with the c struct TIME_ZONE_INFORMATION (link text) which is pretty crazy if i'm fair... Date math and SQL are something to be admired, sadly its something i have never really dug deep into beyond stripping times. Any help would be greatly appriciated. PS: mssql 2005 btw..

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• Dynamic access of classes of a given namespace

  - by user322383

  Hi! I'm writing an interface that will be implemented by a lot of classes, and I'm writing a class that will hold a collection of instances of these implementations. Every class will have a default constructor. So, is there a simple way (e.g. using some kind of reflection) to put an instance of each of these implementing classes to the collection? Besides doing it manually, which is simple, yes, but a lot of work and error prone (what if I missed an implementation while writing the method? What if a new implementation came and I forgot to update the given method?). So, what I would like is to be able to iterate through all classes of a given namespace or maybe through the list of all available classes. My method then would simply check, through reflection, if the given class implements the given interface, and if it does, puts it into the collection. Thank you.

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• Given a number of rectangles that can be rotated, find an enclosing rectangle of minimum area

  - by efficiencyIsBliss

  So, I'm trying to implement an algorithm that takes in a number of rectangles as input and tries to pack them into a rectangle of minimum area. The rectangles can all be rotated by 90 degrees. I realize that this is similar to the bin packing problem, but I am unable to find a good algorithm that accounts for the rotation. I found a paper that discusses this at length here and while I understand the article itself, I was hoping to find something simpler. Any suggestions? -Edit- I think I misstated the problem earlier. We are given a number of rectangles, such that each can be rotated by 90 degrees. We need to find a rectangle that fits all the given rectangles such that no two rectangles overlap, while minimizing the area of the enclosing rectangle. The problem I face here is that we are asked to find the minimum, as opposed to being given an enclosing rectangle and checking if the given rectangles fit or something of that sort.

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• In a given Json, search for the particular given string based on key, return true if found, else false Using jQuery/Javascript

  - by NaanuManu

  Given JSON String/object {"selectAll":false,"include":{"country_197":{"id":"197","data_type":"country","name":"Singapore","desc":"","parent_key_id":"all_all","status":""},"country_100":{"id":"100","data_type":"country","name":"India","desc":"","parent_key_id":"all_all","status":""}},"exclude":{"state_2":{"id":"2","data_type":"state","name":"Andhra Pradesh","desc":"","parent_key_id":"country_100","status":""}}} Given search string is: country_100 Required : Have to search for country_100 in Given JSON String/object by key parent_key_id Ex: searching country_100 is found : {"selectAll":false,"include":{"country_197":{"id":"197","data_type":"country","name":"Singapore","desc":"","parent_key_id":"all_all","status":""},"country_100":{"id":"100","data_type":"country","name":"India","desc":"","parent_key_id":"all_all","status":""}},"exclude":{"state_2":{"id":"2","data_type":"state","name":"Andhra Pradesh","desc":"","parent_key_id":"**country_100**","status":""}}} So return True, else return false please help me in finding a solution.

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• VBoxManage: The given path [UUID] is not fully qualified

  - by Tgr

  $ vboxmanage clonehd foo.vmdk bar.vmdk 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% Clone hard disk created in format 'VMDK'. UUID: f9dffd47-4907-44a5-b3f9-40eba3953d24 $ vboxmanage showhdinfo "f9dffd47-4907-44a5-b3f9-40eba3953d24" VBoxManage: error: The given path 'f9dffd47-4907-44a5-b3f9-40eba3953d24' is not fully qualified I can just use the path name, but it is annoying. What do I need to make the hd commands work with an UUID?

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