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• How can I enforce directory space limits in a OpenVPZ system?

  - by George

  The title says it all. I have some programs on a server (centos4-openvz) that use a directory as temp directory - but pay no attention to the size it grows. I want to enforcee a limit, like this folder cannot exceed 300mb. I would use quota but OpenVZ does not support loop devices to mount a file as such. Any other solutions? (apart from scripting a periodic delete of files in the directory). Editing the application's code to implement such a functionality is not entirely out of the question - if it can be done easily and no other ways exist.. Its written in cpp - but I don't know how to implement it.

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• WiFi on HP Pavilion dv6 stopped working after update to 11.10

  - by Jason

  I am running Ubuntu 11.10 and Windows 7 on my HP Pavilion dv6. Before the 11.10 update, everything was working perfectly, but after I updated, I've never been able to use the WiFi with Ubuntu. For the most part, I've just stuck to Windows and when I've needed to use Ubuntu, I've just been plugging in a network cable. The additional drivers are installed and it says they're active, but the wireless isn't working. What can I do to find the problem?

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• A LEGO-Themed Take On the Movie Inception [Video]

  - by Jason Fitzpatrick

  This Inception-inspired short film combines LEGO and CGI to great effect. Courtesy of a Staffordshire University design team, the short is a result of roughly a thousand hours of design work spread between seven students to serve as their semester project in visual FX. It has everything you could want from Inception rendered in LEGO: folding landscapes, flying bricks, an a LEGO man or two even loses his head. [via Geeks Are Sexy] HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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• What is the current state of multiseat in Ubuntu?

  - by George Edison

  I am considering setting up a multiseat configuration in Ubuntu. However, in the past, this has been notoriously complicated. I am wondering if things have improved any and what the current way of setting it up is. (for Ubuntu 9.10)

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• Find Waldo with Mathematica

  - by Jason Fitzpatrick

  If you’re looking for a geeky (and speedy) way to find Waldo, of the Where’s Waldo? fame, this series of Mathematica scripts makes it a snap. Over at Stack Overflow, programmer Arnoud Buzing shares a clever bit of Mathematica-based coding that analyzes a Where’s Waldo? drawing and finds the elusive Waldo. Hit up the link below to see the distinct steps of analysis with accompanying photos. How Do I Find Waldo with Mathematica? [via Make] How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• How to bulk mail-enable contacts from AD in Exchange 2007?

  - by George Hewitt

  Hello, We have several thousand 'contacts' setup in AD already for a faxing system. We're migrating to an online fax provider that uses e-mail rather than plain old telephone. So, we've bulk edited all the AD records so that the 'mail' attribute is populated with the right e-mail address in the right format. Now, how do we enable these contacts within Exchange 2007? I've looked through http://technet.microsoft.com/en-us/library/bb684891.aspx but that only seems to talk about manually editing the CSV output to specify the external addresses. AD already knows the external e-mail addresses - I just need the info in Exchange! Any thoughts?

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• What You Said: How You Set Up a Novice-Proof Computer

  - by Jason Fitzpatrick

  Earlier this week we asked you to share your tips and tricks for setting up a novice-proof computer; read on to see how your fellow readers ensure friends and relatives have a well protected computer. Image available as wallpaper here. If you only listen to a single bit of advice from your fellow readers, let that advice be the importance of separate and non-administrative user accounts. Grant writes: I have two boys, now 8 and 10, who have been using the computer since age 2. I set them up on Linux (Debian first, now Ubuntu) with a limited rights account. They can only make a mess of their own area. Worst case, empty their home directory and let them start over. I have to install software for them, but they can’t break the machine without causing physical damage (hammers, water, etc.) My wife was on Windows, and I was on Debian, and before they had their own, they knew they could only use my computer, and only logged in as themselves. All accounts were password protected, so that was easy to enforce. What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives? How To Log Into The Desktop, Add a Start Menu, and Disable Hot Corners in Windows 8 HTG Explains: Why You Shouldn’t Use a Task Killer On Android

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• Impact Earth Lets You Simulate Asteroid Impacts

  - by Jason Fitzpatrick

  If you’re looking for a little morbid simulation to cap off your Friday afternoon, this interactive asteroid impact simulator makes it easy to the results of asteroid impacts big and small. The simulator is the result of a collaboration between Purdue University and the Imperial College of London. You can adjust the size, density, impact angle, and impact velocity of the asteroid as well as change the target from water to land. The only feature missing is the ability to select a specific location as the point of impact (if you want to know what a direct strike to Paris would yield, for example, you’ll have to do your own layering). Once you plug all that information in, you’re treated to a little 3D animation as the simulator crunches the numbers. After it finishes you’ll see a breakdown of a variety of effects including the size of the crater, the energy of the impact, seismic effects, and more. Hit up the link below to take it for a spin. Impact Earth [via Boing Boing] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• How Does Windows Confirm Wi-Fi Access and Whether Hot Spot Authentication Is Necessary?

  - by Jason Fitzpatrick

  Windows is quite adept at telling you if you have a properly functioning Internet connection, but how exactly does it do so? Digging into how Windows handles the problem offers insight into Windows connectivity messages. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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• PHP fopen fails - does not have permission to open file in write mode.

  - by George

  Hello. I have an Apache 2.17 server running on a Fedora 13. I want to be able to create a file in a directory. I cannot do that. Whenever I try to open a file with php for writing fopen(,'w'), it tells me that I don't have permission to do that. So i checked the httpd.conf file in /etc/httpd/conf/. It says user apache, group apache. So I changed ownership (chown -R apache:apache .*) of my whole /www directory to apache:apache. I also run chmod -R 777 * Apart from knowing how terribly dangerous this is, it actually still gives me the same error, even though I even allow public write!

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• ExcelBook Conceals Facebook Browsing in a Spreadsheet

  - by Jason Fitzpatrick

  If you can’t get enough of social media while you’re at work, ExcelBook hides your Facebook browsing inside a spreadsheet. It’s certainly not the way to win the employee of the month award, but if you’re looking for a subtle way to browse and update Facebook from your cube ExcelBook offers and Adobe Air-based Facebook interface that looks like a spreadsheet application. Hit up the link below to grab a copy. ExcelBook [BeStupidAtWork via Yahoo! News] HTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)What is a Histogram, and How Can I Use it to Improve My Photos?

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• Instapaper Updates; Sports Native Social Media Sharing, Browsing, and More

  - by Jason Fitzpatrick

  Popular web content manager Instantpaper has updated to version 3.0 and brings a host of new features like native support for social media sharing, a recommendation system, in-app web browsing and more. Last year we shared a detailed guide with you on how to use Instapaper to save content from the web to your iOS device for later reading–definitely check it out if you’re unfamiliar with Instapaper. Some of the new features in Instapaper 3.0 include a social recommendation system where you can follow other Instapaper users and see the articles they are liking/sharing, native support for sharing to Twitter, Facebook, and other social media systems, smart rotation lock on the display, and more efficient article downloading and storage. Check out the link below to read a full rundown of the new features on the Instapaper blog. Instapaper 3.0 Is Here! [Instapaper via O'Reilly Radar] HTG Explains: What Are Character Encodings and How Do They Differ?How To Make Disposable Sleeves for Your In-Ear MonitorsMacs Don’t Make You Creative! So Why Do Artists Really Love Apple?

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• Citrix Error: Your user profile was not loaded correctly

  - by George

  We get this error from out citrix server: Your user profile was not loaded correctly! You have been logged on with a temporary profile. Changes you make to this profile will be lost when you log off. Please see the event log for details or contact your administrator. I am well aware there is a workaround by Citrix, that can be found here, but that doesn't permanently fix our issue. It seems to come back. Any idea why that happens? Any suggestions on how to fix it? Citrix version is 4.5 running on Windows 2003 x32 EDIT 14.IX.2012 @ 16.03 CT I am sorry, let me clarify, it happens to some users, not all and not all the time.

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• python factory function best practices

  - by Jason S

  Suppose I have a file foo.py containing a class Foo: class Foo(object): def __init__(self, data): ... Now I want to add a function that creates a Foo object in a certain way from raw source data. Should I put it as a static method in Foo or as another separate function? class Foo(object): def __init__(self, data): ... # option 1: @staticmethod def fromSourceData(sourceData): return Foo(processData(sourceData)) # option 2: def makeFoo(sourceData): return Foo(processData(sourceData)) I don't know whether it's more important to be convenient for users: foo1 = foo.makeFoo(sourceData) or whether it's more important to maintain clear coupling between the method and the class: foo1 = foo.Foo.fromSourceData(sourceData)

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• Happy Tau Day! (Or: How Some Mathematicians Think We Should Retire Pi) [Video]

  - by Jason Fitzpatrick

  When you were in school you learned all about Pi and its relationship to circles and turn-based geometry. Some mathematicians are rallying for a new lesson, on about Tau. Michael Hartl is a mathematician on a mission, a mission to get people away from using Pi and to start using Tau. His manifesto opens: Welcome to The Tau Manifesto. This manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension. For millennia, the circle has been considered the most perfect of shapes, and the circle constant captures the geometry of the circle in a single number. Of course, the traditional choice of circle constant is p—but, as mathematician Bob Palais notes in his delightful article “p Is Wrong!”,1 p is wrong. It’s time to set things right. Why is Pi wrong? Among the arguments is that Tau is the ration of a circumference to the radius of a circle and defining circles by their radius is more natural and that Pi is a 2-factor number but with Tau everything is based of a single unit–three quarters of a turn around a Tau-defined circle is simply three quarters of a Tau radian. Watch the video above to see the Tau sequence (which begins 6.2831853071…) turned into a musical composition. For more information about Tau hit up the link below to read the manifesto. The Tau Manifesto [TauDay] HTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)What is a Histogram, and How Can I Use it to Improve My Photos?

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• Roll Your Own Flexi-Ties to Secure and Store Frequently Used Cables

  - by Jason Fitzpatrick

  If you’re looking for an easy way to hang up or tidy frequently used cables, these DIY soft ties are durable, resuable, and easy to make. Soft ties ties are metal wire ties coated in rubber; people use them for everything from securing computer cables to shaping garden plants. Instructables user Bobzjr wanted a lot of them but couldn’t find anyone that sold bulk roles of the soft tie material. To that end he did a little exploring at the hardware store and found the perfect combination of wire and rubber to roll his own. Hit up the link below for more information on his DIY soft tie project. Roll Your Own Flexi-Ties (Soft Twist Ties) [Instructables] How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• From the Tips Box: Free Shipping with Amazon Filler, Repairing Ethernet Cables, and Emergency Stickers

  - by Jason Fitzpatrick

  Once a week we round up some great tips from the tips box and share them with everyone. This week we’re looking at easy Amazon filler items, repairing the tab on Ethernet cable connectors, and a humorous data-security sticker. How to Own Your Own Website (Even If You Can’t Build One) Pt 1 What’s the Difference Between Sleep and Hibernate in Windows? Screenshot Tour: XBMC 11 Eden Rocks Improved iOS Support, AirPlay, and Even a Custom XBMC OS

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• Cutting the Cable: The State of Internet-based TV [Infographic]

  - by Jason Fitzpatrick

  If you’ve been turning your cable box on less and watching more shows online, you’re certainly not alone. Check out this infographic look at the state of TV distribution in the digital age to see how everyone is getting their TV fix. People are watching more media online, less from traditional distribution channels, and in a more mobile and selective way than ever before. Hit up the link below to check out the full infographic with a shake down of how media consumption has shifted and who is jockeying for a slice of the consumers’ attention. Cutting the Cable: The State of Internet-based TV [Daily Infographic] How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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• Finding the Best Spot in the Microwave [Video]

  - by Jason Fitzpatrick

  Where’s the best spot in the Microwave? In this video we see a neat hands-on demonstration with some LED lights that shows just how the microwave beam in your microwave works. In the above video from Smarter Ever Day they visit the National Electronics Museum and get a first person look at how microwaves work and why nearly every microwave you’ll ever own has a turn table. Best Spot in the Microwave? [YouTube] How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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• A seekable one-frame FLV video (with audio)?

  - by George Stephanos

  Is it possible to generate an FLV out of an MP3 and a JPG, without uselessly looping the image and still be able to seek the audio ? This command generates a non-seekable video: ffmpeg -y -i audio.mp3 -i image.jpg -r 1 -acodec copy video.flv and this one generates a seekable one, but with uselessly looping the image occupying both space and time: ffmpeg -y -loop_input -i audio.mp3 -i image.jpg -r 1 -acodec copy video.flv -shortest

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• What You Said: The First Things to Do After Installing a New OS

  - by Jason Fitzpatrick

  Earlier this week we asked you to share the steps you went through after installing a new operating system. You responded and we rounded up your responses. Our Ask the Readers series gives you, the awesome How-To Geek reader, a chance to share your tips, trick, and technological know-how with your fellow readers right on the front page. Every week we ask a question and every week we round up your tips to share. This week we’re taking a look at your tips and tricks from What’s the First Thing You Do After Installing a New OS.HTG Explains: What’s the Difference Between the Windows 7 HomeGroups and XP-style Networking?Internet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?

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• HP Deskjet 3600: Offline and won't stop blinking and won't print.

  - by George Bailey

  Using Vista and an HP Deskjet 3600 on USB connection Normally when I unplug the printer, I open the printer queue and in the title bar it says "HP Deskjet 3600 - Use Printer Offline" then the offline message will go away and it will start printing. But for some reason, the bower button light is continually blinking. (this is the only light on the machine). The printer queue says "HP Deskjet 3600 - Offline" and when I unplug it it says "HP Deskjet 3600 - Offline - Use Printer Offline". I have tried unplugging it for a few hours, also tried turning it off for a few hours. Does anybody know what the single word Offline means? Does anybody know how I can clear out the memory in the Printer? (this is my guess as to what is causing the problem)

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• What Controls Exposure? [Infographic]

  - by Jason Fitzpatrick

  This simple infographic showcases how your camera shutter speed, ISO, and aperture all work together to produce the photographic effect you’re looking for. The infographic is part of Exposure Guide’s Exposure 101 tutorial and, while the graphic can stand alone, we highly recommend checking out the full introductory guide at the link below. Exposure 101 [Exposure Guide] HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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• Turn a Kindle into a Weather Display Station

  - by Jason Fitzpatrick

  The e-ink display, network connectivity, and low-power consumption of Kindle ebook readers make them a perfect candidate for an infrequently refreshed high-visibility display–like a weather display. Read on to see how to hack a Kindle to serve up the local weather. Tinker and hardware hacker Matt Petroff hacked his Kindle to accept input from a web server and then, graciously and in the spirit of geeky projects everywhere, shared his source code. He explains the heart of the project: The server side of the system uses shell and Python scripts to convert weather forecast data into an image for the Kindle. The scripts first download and parse forecast data from NOAA via the National Digital Forecast Database XML/SOAP Service. After parsing the data, the data then needs to be converted into an image. This is accomplished by preprocessing a specially crafted SVG file to insert temperatures, forecast symbols, and days of the week. This SVG is then rendered as a PNG using rsvg-convert and converted to a grayscale, no transparency color space as required by the Kindle using pngcrush. Finally, it is copied to a public location on the web server. The Kindle is set to refresh twice a day (you could easily tweak the scripts for a more frequent refresh) and displays the forecast as seen in the photo above–with crisp and easy to read text and icons. Hit up the link below for more information and the project’s source code. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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• What You Said: How Do You Set Reminders?

  - by Jason Fitzpatrick

  Earlier this week we asked you to share your favorite tricks for staying on top of your tasks with timely reminders. Now we’re back to highlight some great reader tips (including a bit of software older than some of our readers). Most of us have to-do lists longer than we can do in a given day (or week!) and a constantly changing set of demands and next-actions. Having a timely and effective reminder system is the difference between dropping the ball and getting things done; how exactly that reminder system plays out, however, varied greatly from reader to reader. OJMDC sticks with analog reminders: Sticky notes in the middle of my monitor and in my wallet. I’ve tried my phone apps but I typically disregard them. HTG Explains: Is UPnP a Security Risk? How to Monitor and Control Your Children’s Computer Usage on Windows 8 What Happened to Solitaire and Minesweeper in Windows 8?

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