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  • Preventing SSH RSA host key warnings for change of key vs IP address

    - by Adam M-W
    I have a network with DHCP enabled, and also a computer that dual boots operating systems and has different SSH keys on each (and yes, I would like to keep different keys on each rather than copying the same identity/private key to each). Because the IP address does not change between operating systems because the MAC address is the same, when connecting to ssh, even when not using the IP address but the hostname via DNS/mDNS, I get the warning: Warning: the RSA host key for 'hostname' differs from the key for the IP address '192.168.1.172' Offending key for IP in /Users/user/.ssh/known_hosts:37 Matching host key in /Users/user/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? How can I surpress the warning when the hostname differs from the IP address for that hostname, but retain the ability to check host keys are the same for each hostname? (each OS has a unique hostname)

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  • Using NBuilder to mock up a data driven UI - Part 2

    In this article we will continue our discussion by filling out the implementation in our service class with some NBuilder code. Once we have the working service class in place we can then create a working UI (in the ASP.NET MVC project we created in the last article).

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  • Searching for entity awareness in 3D space algorithm and data structure

    - by Khanser
    I'm trying to do some huge AI system just for the fun and I've come to this problem. How can I let the AI entities know about each other without getting the CPU to perform redundant and costly work? Every entity has a spatial awareness zone and it has to know what's inside when it has to decide what to do. First thoughts, for every entity test if the other entities are inside the first's reach. Ok, so it was the first try and yep, that is redundant and costly. We are working with real time AI over 10000+ entities so this is not a solution. Second try, calculate some grid over the awareness zone of every entity and test whether in this zones are entities (we are working with 3D entities with float x,y,z location coordinates) testing every point in the grid with the indexed-by-coordinate entities. Well, I don't like this because is also costly, but not as the first one. Third, create some multi linked lists over the x's and y's indexed positions of the entities so when we search for an interval between x,y and z,w positions (this interval defines the square over the spatial awareness zone) over the multi linked list, we won't have 'voids'. This has the problem of finding the nearest proximity value if there isn't one at the position where we start the search. I'm not convinced with any of the ideas so I'm searching for some enlightening. Do you people have any better ideas?

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  • What are the most known arbitrary precision arithmetic implementation approaches?

    - by keykeeper
    I'm going to write a class library for .NET which provide an implementation of arbitrary precision arithmetic for integer, rational and maybe complex numbers. What best known approaches should I become familiar with? I tried to start with Knuth's TAOCP Vol.2 (Seminumerical Algorithms, Chapter 4 – Arithmetic) but it's too complicated. At least I couldn't get the ideas in a relatively short period of time.

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  • How do you change data from a qr code on a scanner [on hold]

    - by Malcolm Eaton
    I have a problem now with the QR bar codes on the Wheelie Bins we deliver. The scan was giving us the following .. RL0313550 Now due to some changes at the manufacturing plant they have had to add more data as follows. 1234567891,RL031550 We only need the "RL031550" can anyone let me know how to fix this. We use Intermec CN50 device with 2d Imager fitted, was hoping to fix this within the device settings.

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  • Is type safety worth the trade-offs?

    - by Prof Plum
    I began coding in in Python primarily where there is no type safety, then moved to C# and Java where there is. I found that I could work a bit more quickly and with less headaches in Python, but then again, my C# and Java apps are at much higher level of complexity so I have never given Python a true stress test I suppose. The Java and C# camps make it sound like without the type safety in place, most people would be running into all sorts of horrible bugs left an right and it would be more trouble than its worth. This is not a language comparison, so please do not address issues like compiled vs interpreted. Is type safety worth the hit to speed of development and flexibilty? WHY? to the people who wanted an example of the opinion that dynamic typing is faster: "Use a dynamically typed language during development. It gives you faster feedback, turn-around time, and development speed." - http://blog.jayway.com/2010/04/14/static-typing-is-the-root-of-all-evil/

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  • recover from sudo rm -rf command

    - by user106116
    By mistake, I ended up executing "rm -rf /" command from sudo on my laptop which erased many files before it stopped. Now when I restarted my system , it gives a GRUB rescue prompt. I am having dual boot with Ubuntu 12.04 and Windows 7 I request the help for following: How do I fix the currently installed Ubuntu without overwriting/erasing the left over files (from rm -rf command)? Is using Boot-Repair safe ? Is there a way to directly go to Windows 7?

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  • When to use an Array vs When to use a Vector, when dealing with GameObjects?

    - by user32465
    I understand that from other answers, Arrays and Vectors are the best choices. Many on SE claim that Linked Lists and Maps are bad for video game programming. I understand that for the most part, I can use Arrays. However, I don't really understand exactly when to use Vectors over Arrays. Why even use Vectors? Wouldn't it be best if I simply always used an Array, that way I know how much memory my game needs? Specifically my game would only ever load a single "Map" area of tiles, such as Map[100][100], so I could very easily have an array of GameObjectContainer GameObjects[100][100], which would reserve an entire map's worth of possible gameobjects, correct? So why use a Vector instead? Memory is quite large on modern hardware.

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  • How to name setter that does data conversion?

    - by IAdapter
    I'm struggling with how to name this method, I don't like the "set" prefix, because I feel it should be reserved for normal "dumb" setters and some tools might not like it (i did not check it in checkstyle, pmd, etc., but I got a feeling they won't like it.) for example (in java, but I feel its language agnostic) public void setActionListenerClicked(boolean actionListenerClicked) { this.actionListenerClicked = actionListenerClicked ? "1" : "0"; } The only purpose of this method is ONLY to set, this method is needed and cannot be joined with any other (because of framework used). P.S. I DO know that question is similar to How to name multi-setter?, but I feel its not the same question.

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  • Most efficient Implementation a Tree in C++

    - by Topo
    I need to write a tree where each element may have any number of child elements, and because of this each branch of the tree may have any length. The tree is only going to receive elements at first and then it is going to use exclusively for iterating though it's branches in no specific order. The tree will have several million elements and must be fast but also memory efficient. My plan makes a node class to store the elements and the pointers to its children. When the tree is fully constructed, it would be transformed it to an array or something faster and if possible, loaded to the processor's cache. Construction and the search on the tree are two different problems. Can I focus on how to solve each problem on the best way individually? The construction of has to be as fast as possible but it can use memory as it pleases. Then the transformation into a format that give us speed when iterating the tree's branches. This should preferably be an array to avoid going back and forth from RAM to cache in each element of the tree. So the real question is which is the structure to implement a tree to maximize insert speed, how can I transform it to a structure that gives me the best speed and memory?

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  • SEO - different data with same title and keywords

    - by Junaid Saeed
    here is my scenario i have a website where i redirect my users basing upon the device they were using, lets say a user is visiting from an iPad, i take him directly to the page of iPad wallpapers, the user selects iPad version & i take the user to the gallery of wallpapers where the user can select & download any wallpaper. Every wallpaper is the required resolution, i have my reasons for doing this, now the thing is there are diff. resolution. versions of an image appearing one 5 diff. sections of my website, each having their own view page Now there is only one record in db.table for the image, and basing on the my consistent naming convention of the images, i pick the required image. this means when 5 different pages are generated in 5 categorized sections of the website, due to a shared DB record, the keywords, the titles and every single detail of the 5 pages is same besides the resolution of the image, and the section specific details that the page has and yeah the pages also have different paths like wallpapers.com\ipad-1\cars\Ferrari-dino.html wallpapers.com\ipad-2\cars\Ferrari-dino.html wallpapers.com\ipad-3\cars\Ferrari-dino.html wallpapers.com\ipad-4\cars\Ferrari-dino.html wallpapers.com\ipad-5\cars\Ferrari-dino.html now this is my scenario, How do Search Engines see it and how do they rank it? Is it a Good or Normal or Bad SEO practice? If bad how dangerous it is for my sites SEO? i need your comments on my scenario.

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  • How to change the amount of RAM displayed in System Properties

    - by Nicu Zecheru
    I have this product that requires at least 1 GB Physical Memory in order to be installed. On my XP Pro machine I have 1 GB of RAM but in System Properties only 0.99 GB of RAM is displayed. The problem is that the product installer checks the memory displayed in System Properties (just a guess, not sure) and cannot continue the setup because it sees only 0.99 GB. Is there any way to change the displayed memory in the System Properties? Or how can I trick the installer to skip the memory check? Thanks.

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  • Change Linux Console's Default Monitor

    - by Tim M
    Is there any way to specify which monitor the console is displayed on in Linux? Details: I have a 3 monitor setup with 2 video cards. When I boot the computer, the BIOS displays on the PCI graphics card (which has a small monitor). When starting Linux, the console is displayed on the same monitor. Is there a way to have the console output on a different monitor? I'm using the vesafb framebuffer. I don't see a way in my BIOS to change the default video card.

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  • PHPForm Data Generate PDF & Send to Email?

    - by tom
    I'm a beginner in PHP I was wondering if this is easy to do or if i'd have to outsource this to a programmer - Basically when a user fills in the PHP Form and submits it I need this to generate as a PDF (with all the labels etc) which will then email/attach to MY email and NOT the user who submitted this form. I have looked at tcpdf, fpdi but i dont think any of those scripts allow me to do this specifically as from what i heard it generates a download link for the user, and that is not what i need. If anyone can help me it would be greatly appreciated. Regards Tom

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  • Octrees as data structure

    - by Christian Frantz
    In my cube world, I want to use octrees to represent my chunks of 20x20x20 cubes for frustum and occlusion culling. I understand how octrees work, I just dont know if I'm going about this the right way. My base octree class is taken from here: http://www.xnawiki.com/index.php/Octree What I'm wondering is how to apply occlusion culling using this class. Does it make sense to have one octree for each cube chunk? Or should I make the octree bigger? Since I'm using cubes, each cube should fit into a node without overlap so that won't be an issue

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  • Gnome 3 - Unable to change date and time

    - by Chris Harris
    I am running Arch Linux with Gnome 3. Unfortunately, although my time and date settings in /etc/rc.conf show that HARDWARECLOCK='UTC' and TIMEZONE='America/LosAngeles'. I continue to get the timezone of Europe/London. If I try to change the date and time via the GUI. It requires root access. After authorizing root access, the date and time may be changed; however, after closing the GUI window, it automatically reverts back to the previous incorrect timezone. I am able to use pool.ntp.org in order to sync my time to the correct one; however, this works only for the current session and is not fixed. This solution is inconvenient since there is not always network access. What other solutions are available for this problem?

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  • Change permission to /proc/net/ip_conntrack on Ubuntu server 9.10

    - by bjarkef
    Hi I have a script that needs to extract certain information form the /proc/net/ip_conntrack file once in a while. I do not wish to run this script as the root user. Default permissions for the file is: $ ls -lah /proc/net/ip_conntrack -r--r----- 1 root root 0 2010-03-28 12:18 /proc/net/ip_conntrack I can change it with: sudo chmod o+r /proc/net/ip_conntrack But that does not stick after a reboot. Is there some configuration file for file-permissions in the /proc directory in Ubuntu Server 9.10? Or do I just have to stick a chmod line in some startup script?

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  • Advice for migrating email server

    - by Chris Adams
    Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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  • Player & Level class structure in 2D python console game?

    - by Markus Meskanen
    I'm trying to create a 2D console game, where I have a player who can freely move around in a level (~map, but map is a reserved keyword) and interfere with other objects. Levels construct out of multiple Blocks, such as player(s), rocks, etc. Here's the Block class: class Block(object): def __init__(self, x=0, y=0, char=' ', solid=False): self.x = x self.y = y self.char = char self.solid = solid As you see, each block has a position (x, y) and a character to represent the block when it's printed. Each block also has a solid attribute, defining whether it can overlap with other solids or not. (Two solid blocks cannot overlap) I've now created few subclasses from Block (Rock might be useless for now) class Rock(Block): def __init__(self, x=0, y=0): super(Rock, self).__init__(x, y, 'x', True) class Player(Block): def __init__(self, x=0, y=0): super(Player, self).__init__(x, y, 'i', True) def move_left(self, x=1): ... # How do I make sure Player wont overlap with rocks? self.x -= x And here's the Level class: class Level(object): def __init__(self, name='', blocks=None): self.name = name self.blocks = blocks or [] Only way I can think of is to store a Player instance into Level's attributes (self.player=Player(), or so) and then give Level a method: def player_move_left(self): for block in self.blocks: if block.x == self.player.x - 1 and block.solid: return False But this doesn't really make any sense, why have a Player class if it can't even be moved without Level? Imo. player should be moved by a method inside Player. Am I wrong at something here, if not, how could I implement such behavior?

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  • Change permission of files with the owner 'apache'

    - by Dotty
    Hay, i have some files on my server with the owner set to "apache", I'm not quite sure how this happened. Anyway, i need to change the permission of these files to 0777 so i can download/edit them. However i cannot. I'm using a 1and1 Linux server and use Plesk to administrate it. I have the ability to login via SSH. However, if i run chmod or chown i get a "permission denied" error, and if i try to sudo chmod or chown it says the command cannot be found. When i go to edit my domain details, i get this option Shell access to server with FTP user's credentials and have these options /bin/sh /bin/bash /sbin/nologin /bin/bash (chrooted) /bin/rbash Any idea's how i should go about changing the permissions or changing the owner? Thanks

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  • Accidentally hit shortcut and lost text in web browser. Can it be disabled?

    - by uniomni
    I have noticed that I occasionally hit some shortcut while typing that either kills the browser or otherwise causes me to lose e.g. a post I am writing. This typically happens if I type while on a bumpy road or something like that. It also just happened to my eight year old daughter ;-( I think the shortcut in question is CTRL-w which (at least in Firefox) closes the current tab and consequently whatever content is being written. I would like to know if anyone has noticed this and if someone has a solution e.g. a way to disable "dangerous" shortcuts if at all possible. Many thanks Ole (uniomni)

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