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• How to Get MacBook-Style Finger Gestures on Ubuntu Linux

  - by Zainul Franciscus

  Apple users have been swiping, pinching, and rotating Mac’s user interfaces to their fingers’ content. In today’s article, we’ll show you how to do groovy things like expanding and reducing windows, and changing desktops using finger gestures. To accomplish this, we’ll use a piece of software called TouchEgg, which enhances Ubuntu’s multi touch capability by allowing us to configure actions to the finger gestures that TouchEgg supports. If you’re a Windows user and like the idea of finger-gestures, we also wrote a tutorial on how to enable MacBook-Style finger gestures on Windows 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 SnapBird Supercharges Your Twitter Searches Google’s New Personal Blocklist Extension Kills Search Engine Spam KeyCounter Tracks Your Keystrokes and Mouse Clicks Add Custom LED Ambient Lighting to Your PC or Media Center The Trackor Monitors Amazon Prices; Integrates with Chrome, Firefox, and Safari Four Awesome TRON Legacy Themes for Chrome and Iron

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• 'Unblock' / 'Yellow Out' game questions

  - by pimvdb

  I would very much like to build a game that is known as 'Unblock' or 'Yellow Out'. It is a puzzle game in which the task is to move a car out of a parking space by moving other cars in certain directions. These are links where the game can be played: Yellow Out Unblock My questions concerning this game are: Is this game actually licensed? I see it's available under two names (perhaps even more). Does this mean the game idea can be used freely? Is there an article about it? I have not been able to find it on Wikipedia. I would like to gather some information about the game so as to understand more details of it. Is there some database with puzzles available? I can just check the puzzles of existing games, but that's a pain because I have to finish a level to get on to the following one. I was wondering whether there is a general list of puzzles somewhere. Thanks!

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• indirect rendering issue on 12.04, using ati driver

  - by lurscher

  I have ubuntu 12.04 64-bit system, when i run glxinfo i see some strange error about indirect rendering and failed to load some lib32/dri/swrast_dri libraries. Any idea what is going on? please let me know if i can enhance the relevant information provided in this question $ LIBGL_DEBUG=verbose glxinfo name of display: :0 libGL: screen 0 does not appear to be DRI2 capable libGL: OpenDriver: trying /usr/lib32/dri/tls/swrast_dri.so libGL: OpenDriver: trying /usr/lib32/dri/swrast_dri.so libGL error: dlopen /usr/lib32/dri/swrast_dri.so failed (/usr/lib32/dri/swrast_dri.so: cannot open shared object file: No such file or directory) libGL: OpenDriver: trying /usr/lib/dri/tls/swrast_dri.so libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so libGL error: dlopen /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory) libGL error: unable to load driver: swrast_dri.so libGL error: reverting to indirect rendering display: :0 screen: 0 direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose) server glx vendor string: ATI server glx version string: 1.4 server glx extensions: GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group client glx vendor string: Mesa Project and SGI client glx version string: 1.4 client glx extensions: GLX_ARB_create_context, GLX_ARB_create_context_profile, GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB, GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer, GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, GLX_EXT_texture_from_pixmap, GLX_INTEL_swap_event GLX version: 1.4 GLX extensions: GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_multithread_makecurrent, GLX_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, GLX_EXT_texture_from_pixmap OpenGL vendor string: ATI Technologies Inc. OpenGL renderer string: AMD Radeon HD 6800 Series OpenGL version string: 1.4 (2.1 (4.2.11762 Compatibility Profile Context)) OpenGL extensions: GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_fragment_program, GL_ARB_fragment_program_shadow, GL_ARB_framebuffer_object, GL_ARB_imaging, GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query, GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_shadow, GL_ARB_shadow_ambient, GL_ARB_texture_border_clamp, GL_ARB_texture_compression, GL_ARB_texture_cube_map, GL_ARB_texture_env_add, GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar, GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat, GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle, GL_ARB_transpose_matrix, GL_ARB_vertex_program, GL_ARB_window_pos, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate, GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture, GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit, GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_object, GL_EXT_multi_draw_arrays, GL_EXT_packed_pixels, GL_EXT_point_parameters, GL_EXT_rescale_normal, GL_EXT_secondary_color, GL_EXT_separate_specular_color, GL_EXT_shadow_funcs, GL_EXT_stencil_wrap, GL_EXT_subtexture, GL_EXT_texture3D, GL_EXT_texture_compression_s3tc, GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add, GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_EXT_texture_lod, GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp, GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_vertex_array, GL_ATI_draw_buffers, GL_ATI_texture_env_combine3, GL_ATI_texture_mirror_once, GL_ATIX_texture_env_combine3, GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate, GL_NV_texture_rectangle, GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SGIX_shadow_ambient, GL_SUN_multi_draw_arrays

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• What are the pros and cons of using “Sign in with Twitter/Facebook” for a new website?

  - by Paul D. Waite

  Myself and a friend are looking to launch a little forum site. I’m considering using the “Sign in with Facebook/Twitter” APIs, possibly exclusively, for user login.I haven’t used either of these before, nor run a site with user logins at all. What are the pros and cons of these APIs? Specifically: Is the idea of using them, and/or using them exclusively (i.e. having no login system other than one or both of these), any good? What benefits do I get as a developer from using them? Do end users actually like/dislike them? Have you experienced any technical/logistical issues with these APIs specifically? Here are the pros and cons I’ve got so far: Pros More convenient for the user (“register” with two clicks, sign in with one) Possibly no need to maintain our own login system  Cons No control over our login process Exclude non-Facebook/non-Twitter users (if we don’t maintain our own login system) Exclude Facebook/Twitter users who are worried about us having some sort of access to their accounts Users’ accounts on our site are compromised if their Facebook/Twitter accounts are compromised.

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• What is the 64-bit Firefox Beta PPA?

  - by JamesTheAwesomeDude

  I recently discovered that my computer is 64-bit. I have backed up my Home folder, and reinstalled Ubuntu. The reinstall wasn't nearly as painful as I thought. There is one thing that I can't quite seem to figure out: how do I get the 64-bit Firefox Beta build? I always get the Beta builds, but I want to take advantage of the 64-bit architecture of my computer. this page says that Mozilla has come out with a 64-bit version of Firefox, but I can't seem to find it. I do understand the ramifications of using a 64-bit browser, but I've decided to jump right in and do it anyway. (Flash and Java are already 64-bit, and who cares about Silverlight, since it's not for Linux anyway?) There's only one issue, and it's a big one: I can't find the 64-bit Beta PPA!!! (I really hate using .tar.gz files, but I'd be willing to do that as long as I could still access Firefox via the Launcher. Oh, speaking of which, I don't understand .tar.gz files. Once, I managed to run one (the Dropbox Beta build,) but I have no idea whatsoever on how to install them: as in, click on the icon and go.)

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• Building RPM containing passwords

  - by Kuf

  I need to be able to send an RPM to customers that will install the complete server, including Apache and MySQL. The customers will install it on a clean machine. After installation, the server should connect to our main DB, so I though of including the password in the RPM somehow, encrypted if possible. The reason I'm asking this is because I'm pretty sure that it's not wise to save the password in the rpm scripts. I was hoping that someone else had a similar problem and managed to solve that somehow. If anyone knows a way to do that, or have a better idea please share!

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• How to remove 'ApacheMonitor.exe' from notification area

  - by ekaj

  For some reason I had 2 instances of Apache running, and I have no idea how. I also had two instances of ApacheMonitor.exe showing in the "Notification Area Icons" place when you right click on your taskbar and go to properties. To fix the multiple instance issue, I deleted Apache completely and uninstalled the service (I did not use the .msi, I install from a .zip). Anyways, Everything from Apache is gone except the two things in the Notification Area Icon page. Does anyone know how to remove these two icons? I have completely uninstalled Apache, cleaned my registry with CCleaner, and rebooted. Does anyone have any other suggestions? Despite what the picture says, I do NOT have Apache installed, and it is not running.

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• Correct way to drive Main Loop in Cocoa

  - by Kyle

  I'm writing a game that currently runs in both Windows and Mac OS X. My main game loop looks like this: while(running) { ProcessOSMessages(); // Using Peek/Translate message in Win32 // and nextEventMatchingMask in Cocoa GameUpdate(); GameRender(); } Thats obviously simplified a bit, but thats the gist of it. In Windows where I have full control over the application, it works great. Unfortunately Apple has their own way of doing things in Cocoa apps. When I first tried to implement my main loop in Cocoa, I couldn't figure out where to put it so I created my own NSApplication per this post. I threw my GameFrame() right in my run function and everything worked correctly. However, I don't feel like its the "right" way to do it. I would like to play nicely within Apple's ecosystem rather than trying to hack a solution that works. This article from apple describes the old way to do it, with an NSTimer, and the "new" way to do it using CVDisplayLink. I've hooked up the CVDisplayLink version, but it just feels....odd. I don't like the idea of my game being driven by the display rather than the other way around. Are my only two options to use a CVDisplayLink or overwrite my own NSApplication? Neither one of those solutions feels quite right.

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• JavaOne Latin America Underway

  - by Tori Wieldt

  JavaOne Latin America started officially today, but lots of networking has already happened. Last night some JUG leaders, Java Champions, and members of the Oracle Java development and marketing teams had dinner together. The conversation ranged from the new direction of JavaFX to how to improve JUG attendance. Maricio Leal shared the idea some Brazilian JUGs have of putting Java Evangelists and experts on a boat and having them visit JUGs on cities along the Amazon river.  We discussed ideas, and shared dessert pizza. It was the perfect community get together! If you see Brazilian Java Man Bruno Souza, ask him what he is bringing to the party.Today, at JavaOne Latin America, all the sessions were full, and developers were spilling into the hallways. Session content was selected with the help of 14 Java thought leaders from Latin America. JavaOne Program Committee Chair, Sharat Chander, said "I'm thrilled that at this JavaOne over half of the content is coming from the community." Between sessions, developers take advantage of the Oracle Technology Network lounge to grab a snack and use their laptops.  OTN LoungeIt promises to be a great JavaOne.

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• DrayTek Vigor 2920(n): VPN with VLAN restrictions?

  - by Dirk

  Hi, I'm currently installing a DrayTek Vigor 2920n router in a new office. This router is to be used for 2 seperate companies. For one of these companies, the router has a LAN-2-LAN (VPN) connection to a datacenter configured. The other company should not be able to access this other (VPN-)network. I'm aware of the capability of this router to have VLAN's, but I cannot figure out how to configure the VPN-connection to only be accessible for VLAN0 and not for VLAN1. I know I can also add another router to physically split both networks, but we bought the DrayTek with the idea that it could easily have the VPN-connection available for VLAN0 and not for VLAN1. VLAN1 can easily be in another subnet, that's fine, although, I don't know how to configure that on this DrayTek. Can anyone point me in the right direction? Thanks in advance, Dirk

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• DNS Settings in Cisco Wireless Lan Controllers

  - by Braden

  The WLC is a 2100 series and I have looked back and forth through the entire web interface. Originally the idea was that the gateway should be the DNS controler and the WLC pointed directly at the gateway. For some reason, random clients are having DNS specific issues when it comes to seeing certain shares around the network. The problems are also very intermittent. Aside from going to each box and implementing a static DNS is there ACTUALLY a DNS setting lodged into the WLC settings (and I am being a numpty and can't find them) or am I stuck with performing the config 1 by 1?

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• Testing for Auto Save and Load Game

  - by David Dimalanta

  I'm trying to make a simple app that will test the save and load state. Is it a good idea to make an app that has an auto save and load game every time the newbies open the first app then continues it on the other day? I'm trying to make a simple app with a simple moving block sprite, starting at the center coordinate. Once I moved the sprite to the top by touch n' drag, I touch the back key to close the app. I expected that once I re-open the app and the block sprite is still at the top. But instead, it goes back to the center instead. Where can I find more ways to use the preferences or manipulating by telling the dispose method to dispose only specific wastes but not the important records (fastest time, last time where the sprite is located via coordinates, etc.). Is there really an easy way or it has no shortcuts but most effective way? I need help to expand more ideas. Thank you. Here are the following links that I'm trying to figure it out how to use them: http://www.youtube.com/watch?v=gER5GGQYzGc http://www.badlogicgames.com/wordpress/?p=1585 http://www.youtube.com/watch?v=t0PtLexfBCA&feature=relmfu Take note that these links above are codes. But I'm not looking answers for code but to look how to start or figure it out how to use them. Tell me if I'm wrong.

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• RAMDiskVE keeps causing computer to freeze

  - by Steph

  I found this in the Event Viewer logs: The description for Event ID 11 from source RAMDiskVE cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. Which doesn't say much. The details don't reveal much more: Failed to read configuration information from registry. 0000000002002C00000000000B0007C0000000000000000000000000000000000000000000000000 So my question is, what is RAMDiskVE and what device is it for? Basically I'm trying to rule out hardware but I have no idea what's failing...

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• Apache proxying to Unicorn server times out, how to avoid?

  - by Ian

  I have a Teambox installation running on Unicorn, and the latter sometimes times out after 30 seconds. The idea of this configuration would be for Apache to wait until the Unicorn master server sends a timeout, because if I'm not wrong, Unicorn will quit the timed-out worker process but spawn a new one to handle the same request. Is there a way to configure Apache to not timeout like the nginx configuration of timeout = 0? Thanks for the help! EDIT I found a way, though it doesn't really work as I expected. In the ProxyPass directive you have to specify a retry=0 option after the url: ProxyPass / http://url/ retry=0 It doesn't work if the url is a ProxyBalancer though.

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• Automatic desktop/work environment setup

  - by Alex

  I have this strange thing I am trying to do, so before I jump into it I was curious if someone knows about existing solution or maybe have an advice as far as implementation. I run a small software company and as it happens I often do very different type of work. When I do coding for Java project I need Eclipse running and maybe VM with something like ActiveMQ server or whatever, plus terminals to tail -F log files specific to the application, etc. When I do something like weekly progress review with my team I need a few browser windows open and a gedit to take notes and so on. Depending on the type of work I am doing I generally have all of the related apps open in multiple different Workspaces. So in the example above Eclipse would be open in Workspace 1, terminals would be sharing Workspace 2 and so on. What I am trying to do is to automate opening of all these applications, positinoning them on the screen and assigning them to proper Workspaces. My current idea consists of having a Shell script that launches specific apps depending on what type of work I am about to start doing. Is there anything to aid this type of automation? Or is my only option is just a shell scripting at this point? My current system is Ubuntu 10.04

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• correct way to prevent SPF failures

  - by Sean Kimball

  I have a website on a hosted server whose mail users are using their ISPs SMTP to send mail. I have set their SPF record to look like this: v=spf1 mx a:comcast.net ip4:216.70.103.0/24 ip4:216.70.101.0/24 ip4:76.96.53.0/24 -all the SMTP host is comcast.net, 76.96.53.0/24 is the ip range they get assigned from. ip4:216.70.103.0/24 ip4:216.70.101.0/24 are the two possible SMTP ranges they could get IF they used their hosting account mail servers [media temple] They are still getting SPF errors, any idea why?

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• Silverlight Cream for April 19, 2010 -- #841

  - by Dave Campbell

  In this Issue: Michael Washington, Jeremy Likness, Giorgetti Alessandro, Antoni Dol, Mike Taulty, and Braulio Diez. Shoutout: Bart Czernicki lists compelling reasons to use Silverlight 4 for LOB apps: Silverlight 4 - What is New for Business Intelligence Scenarios From SilverlightCream.com: Silverlight Advanced MVVM Video Player After the initial posting on his Simple MVVM Video player, Michael Washington got some feedback and decided to do a part 2 demonstrating exactly how easy it is to customize... great tutorial and all the code. Model-View-ViewModel (MVVM) Explained Jeremy Likness has a post up that begins "The purpose of this post is to provide an introduction to the Model-View-ViewModel (MVVM) pattern." -- 'nuff said... If you're not there yet, get there now :) Castle Windsor – Silverlight 4 binaries Giorgetti Alessandro has produced workable Castle Windsor binaries for Silverlight 4. No Unit Tests at this point, but read the post for that information. Silverlight Togglebutton Push Pin Style with IsoStore Antoni Dol has a very nice ToggleButton redone as a pushpin for pinning an app, plus it saves the pinned information to Isolated Storage ... all with source! Silverlight and Xml Binding Mike Taulty fleshes out a sketchy idea he has surrounding databinding Silverlight to XML data by using the ability to databind to string indexers and XPath support. WinToolbar Silverlight widget available on Codeplex Braulio Diez announced a Toolbar library that he and Sebastian Stehlehave posted on CodePlex that looks awesome... you may as well just go get it now, you're going to want to! Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Looking for zsh completion file for osX native commands

  - by Chiggsy

  I've been digging deep into what actually comes with osX in /usr/bin and especially /usr/libexec. Quite good stuff really, although the command syntax is a bit.. odd. Let me direct the curious to the command that made me think of this: networksetup -printcommands I can not think of a command that better illustrates the need for good completion. security -h perhaps, but those commands have a familiar easy-to-read format. I beseech the community, please point me to a place where I can find such a thing. I never type them right, and I ache for tab completion for this Anyone have any idea where I could grab something? I'd prefer to stand on the shoulders of giants instead of trying to make a zsh/bash completion script leap into the world, ready for battle, like Athena, from my forehead. I am no Zeus when it comes to compctl. Not at all.

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• Apache error "No address associated with hostname" on Arch Linux (ZMLarch)

  - by Eedoh

  I'm trying to set up video surveillance system using IP cameras and ZoneAlarm on Arch Linux. I set up fixed IP address, I've managed to get streams from cameras, etc. However, after restart of the machine, I cannot start Apache again. I checked configuration of rc.conf, and saw that static IP configuration has been deleted, and also secondary nameserver in resolv.conf. Tried to re-write these with correct parameters, but now with no effect. This is tail of my /var/log/httpd/error_log file, after /etc/rc.d/httpd restart attempt [Fri Jan 29 04:20:45 2010] [alert] (EAI 5) No address associated with hostname: mod_unique_id: unable to find IPv4 address of "zmhost" Configuration failed Anybody have an idea on how could I fix this?

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• How to enable extended logging for classic asp on IIS7 on Windows 2008 R2

  - by Neil Trodden

  I had to deploy an application that was not written by me onto the above configuration. It is a rather bizarre hybrid of asp.net and classic asp and it's the classic asp that is proving troublesome. The client is having problems with 500 Internal Server Errors appearing and I can see some of these in the logs but I only get the error code and the page name but little else. What I would like to see is the actual error message to at least give me an idea what is going on (or not going on, depending on your point of view) I don't want to display errors in the browser as I don't know the code well enough and this could (for all I know) display some crazy code where the db password is hard-coded into the site.

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• Problems locating Redmine database

  - by zordor

  I have an active redmine but I can not find the database where it is running right now. It should be on PostgreSQL but the database where it should be running is empty. Does anybody have any idea how to check current database used by redmine? Please let me know if you need any extra information. Thank you EDIT: Ok I know the database it is using. On the database.yml I have project_redmine but it is using the database project I dont know why. That database it is used by developers for the actual project. So that is getting me problems of course. I am unable to run it on the right DB (project_redmine) any ideas? :S

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• Stop chkdsk when Windows 7 on one drive and Windows 8 on another

  - by markmnl

  I installed Windows 8 (retail) on a new drive with my Windows 7 drive unplugged. So each Windows has no idea about the other one and I use the BIOS boot options to select which drive hence OS to boot into. Now whenever I boot into Windows 8 then boot into Windows 7, Windows 7 runs chkdisk presumably because Windows 8 messed with it. Is there anyway to stop this? (In hindsight I should have installed Windows 8 with Windows 7 drive plugged in so I could use the Windows dual boot options).

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• Can't resolve localhost on Mac OS X Server

  - by iainbeeston

  I have a server running OS X Server 10.5 and it can't resolve localhost to 127.0.0.1. When I try ping this is what happens: ping localhost ping: cannot resolve localhost: Unknown host SSH and web browsers get similar results (uknown host). If I try using 127.0.0.1 or the ip address assigned on the LAN all of the above work. Here's the contents of my /etc/hosts file: cat /etc/hosts ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost I have no local DNS service running. Does anyone have any idea why this might be happening or how I can fix it?

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• SQLAuthority News – 2 Whitepapers Announced – AlwaysOn Architecture Guide: Building a High Availability and Disaster Recovery Solution

  - by pinaldave

  Understanding AlwaysOn Architecture is extremely important when building a solution with failover clusters and availability groups. Microsoft has just released two very important white papers related to this subject. Both the white papers are written by top experts in industry and have been reviewed by excellent panel of experts. Every time I talk with various organizations who are adopting the SQL Server 2012 they are always excited with the concept of the new feature AlwaysOn. One of the requests I often here is the related to detailed documentations which can help enterprises to build a robust high availability and disaster recovery solution. I believe following two white paper now satisfies the request. AlwaysOn Architecture Guide: Building a High Availability and Disaster Recovery Solution by Using AlwaysOn Availability Groups SQL Server 2012 AlwaysOn Availability Groups provides a unified high availability and disaster recovery (HADR) solution. This paper details the key topology requirements of this specific design pattern on important concepts like quorum configuration considerations, steps required to build the environment, and a workflow that shows how to handle a disaster recovery. AlwaysOn Architecture Guide: Building a High Availability and Disaster Recovery Solution by Using Failover Cluster Instances and Availability Groups SQL Server 2012 AlwaysOn Failover Cluster Instances (FCI) and AlwaysOn Availability Groups provide a comprehensive high availability and disaster recovery solution. This paper details the key topology requirements of this specific design pattern on important concepts like asymmetric storage considerations, quorum model selection, quorum votes, steps required to build the environment, and a workflow. If you are not going to implement AlwaysOn feature, this two Whitepapers are still a great reference material to review as it will give you complete idea regarding what it takes to implement AlwaysOn architecture and what kind of efforts needed. One should at least bookmark above two white papers for future reference. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, SQL White Papers, T SQL, Technology Tagged: AlwaysOn

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• How do I implement the bg, &, and fg commands functionaliity in my custom unix shell program written in C

  - by user1631009

  I am extending the functionality of a custom unix shell which I wrote as part of my lab assignment. It currently supports all commands through execvp calls, in-built commands like pwd, cd, history, echo and export, and also redirection and pipes. Now I wanted to add support for running a command in background e.g. $ls -la& I also want to implement bg and fg job control commands. I know this can be achieved if I execute the command by forking a new child process and not waiting for it in the parent process. But how do I again bring this command to foreground using fg? I have the idea of entering each background command in a list assigning each of them a serial number. But I don't know how do I make the processes execute in the background, then bring them back to foreground. I guess wait() and waitpid() system calls would come handy but I am not that comfortable with them. I tried reading the man pages but still am in the dark. Can someone please explain in a layman's language how to achieve this in UNIX system programming? And does it have something to do with SIGCONT and SIGSTP signals?

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