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• Return to the old C days.

  - by RPK

  Long back I used to program on C and than VB exploitation changed the career path. After VB came the .NET that proved to be a HoneyPot of Microsoft for old VB programmers and frustrated programmers of other hard to learn languages. The label on this HoneyPot was: "Getting things done." I now want to contribute to the Linux and other GNU projects. I feel whatever programming language you learn today, but if programming is your bread-and-butter, you must remain in touch with C. Many things have changed now. From the old Turbo-C for DOS to the present ...? Please advise me how to get back on the C track again. Reading again whole thing, chapter-by-chapter is not possible now, but I can learn by writing small utilities type of things, but sure GUI based. And yes, I hope, learning is going to be easy now with so many live forums and active community spots like StackOverflow etc.

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• Roll Your Own DIY Solar-Powered Security Camera Setup

  - by Jason Fitzpatrick

  If you’re looking to set up a security camera without running power or video lines, this solar-powered version combines a cheap Wi-Fi cam with a home-rolled solar setup to provide surveillance without wires. Courtesy of Reddit user CheapGuitar, the setup combines a dirt cheap off-brand Wi-Fi security camera, a Tupperware container spray painted black, some old camping solar panels, and a battery into a security camera that checks in as long as it’s in range of a Wi-Fi router or repeater. Hit up the link below to check out the build guide. Solar Powered Camera [via Hack A Day] HTG Explains: What Is Windows RT & 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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• Migrating from tomcat to tc server - receiving java.sql.SQLException on startup

  - by user470184

  I'm receiving below error when I start tcServer. I do not receive this error on standalone version of tomcat. Is there extra config I need to add for tcServer ? WARNING: Unexpected exception resolving reference java.sql.SQLException: Io exception: The Network Adapter could not establish the connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387) at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:441) at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:277) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:699) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:631) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:485) at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:143) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:539) at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:237) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:140) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304) at org.apache.naming.NamingContext.lookup(NamingContext.java:793) at org.apache.naming.NamingContext.lookup(NamingContext.java:140) at org.apache.naming.NamingContext.lookup(NamingContext.java:781) at org.apache.naming.NamingContext.lookup(NamingContext.java:153) at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1028) at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:637) at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:238) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.StandardServer.start(StandardServer.java:747) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

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• How to override the new limited keyboard repeat rate limit?

  - by Olivier Pons

  I may be an alien around here, but here's my problem: the speed limit on old Ubuntu releases (= before 11) was very very fast. It was really great for me. Now, on Ubuntu 11, they may have thought: "who will ever want that speed? Nobody! So let's put the maximum speed to a lower limit". It's so stupid that they tried to narrow down the speed to some other famous OS. If Linux is more powerful, why remove some of its power? I don't get that. So is there any way to override that speed limit and get my keyboard as fast as it is on other previous versions?

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• Why are 2 Adobe Flash Plugin on USC (Ubuntu Software Center)?

  - by LuC1F3R

  As you know in Ubuntu Software Center is 2 times Adobe Flash Plugin. One is called Adobe Flash Plugin and other Adobe Flash Plugin 10. Which of the two to install? Or rather it is the recommended installation methods? If we think well, we can install the Adobe Flash plugin for Firefox from the notification date (Install missing plugin) or walking on the Adobe website and downloading the package .deb. After all, how to properly install Flash Player on Linux Ubuntu? (But my biggg question is why are 2 Adobe Flash Plugin on USC? ...for what? If you click on "More Info", the description are the same for both)

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• Can search engine robots read file with permission 640?

  - by dkjain

  I am on a shared web hosting linux server. I want search engine robots/spiders to be able to read the robots.txt but not any one typing www.mysite.com/robots.txt. As per the following google group post, the user specifies that by setting file permission to 640, it's possible to deny access to robots.txt file by the world but still enable search engine robots to read them. Is that true? If not how it's possible to deny general public access to robots.txt but still allow Search engine robots to read them.

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• Mirroring Ubuntu on several systems in a computer lab

  - by Harvey Steck

  I am working in a new refugee school where the only Internet service available is a slow satellite connection. We are about to set up a computer lab (already have desktop systems and am about to install Ubuntu on them). I'm a newbie when it comes to Linux, but it seems a better alternative than pirated copies of Windows. I'd like to set up one Ubuntu system, and then mirror that system on perhaps ten to twenty other systems (all of which would be on an ethernet network). I expect to have an internet connection on the one system that I set up, but then it may be difficult to have enough bandwidth to go through all the same steps on the other ten systems. Can I set up the other ten or twenty computers to get all of their updates/upgrades/configuration from one master system? Can I also set things up so that students cannot change the configuration, install new programs, etc.? Appreciate any help you can give. -- Harvey

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• Purple screen on boot, iMac

  - by Eugene B

  I have just installed Ubuntu 13.10 (special iMac iso found here) on the new iMac (dual boot). Installation of rEFIt was completed successfully, as well as the installation of Ubuntu itself. After the final reboot, rEFIt sees this distributive and allows the choice. When I select "Boot linux from HD", it sends me to grub screen, where I can select Ubuntu. And then it gets stuck on the purple screen (smpboot: Booting Node 0, Processors #1 -- for the recovery mode) with no further action. Does anybody know a solution to this problem? P.S.: I have also tried both 32 and 64-bit pc distributives (occasionally) with the same result.

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• How to hide (in Thunar and Nautilus) a directory without putting a dot in its name?

  - by Ivan

  Usually Linux programs store user's settings in ~/.* directories. But unfortunately some developers (of some applications I need) do not follow this rule and don't start their settings storage folders names with a dot. This results in never-user-used folders cluttering (not the right word perhaps, as there are not many, but they annoy anyway) a home directory. Renaming them is not an option, as the applications won't find them in this case (and will create them again). Is there a way to hide a folder having no dot starting its name from being displayed in common file system browsers (I actually use Thunar of XFCE, alongside with Midnight Commander and Krusader, but wouldn't mind to know about Nautilus too).

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• Favorite, Well-Known Characters as Pacman Ghosts [Humorous Image]

  - by Asian Angel

  Can you name them all? Note: Ryan has a complete list of all the characters at his Flickr page if you find any that you are unable to identify. Pacman Ghosts – Ryan “Dash” Coleman (Flickr) [via Neatorama] HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? 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

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• Failed update of Ubuntu 10.10 results in unbootable system

  - by chessweb

  Hi, yesterday I performed an automatic security update suggested by the update manager on my virtualized (with VirtualBox on a Windows 7 host) Ubuntu 10.10 installation. The update somehow failed and left me with an unbootable system. When I try to boot, I am told that various folders, files, and what not are missing. Then the system drops into a busybox and leaves me with an (initramfs) prompt. This happens with all kernels I get offered by GRUB, although the error messages are quite different from kernel to kernel. Well, the short of it is this: I don't have the slightest idea on how to get back to a working system and this site is the final straw I'm willing to grab. A complete disaster like this following an update initiated and executed by the system is unheard of in Windows-land; at least I haven't heard of it, yet, and therefore I am going to abandon Ubuntu and Linux altogeteher, if there is no remedy. Regards, RSel

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• SSL setup with GoDaddy subdomains and EC2 servers

  - by Kevin

  We have two EC2 instances that are used to host various scripts. Our main page 'companyname.com' is hosted with GoDaddy but is unrelated to those EC2 instances. I need to setup SSL connections for the two EC2 microinstances, one running Linux AMI and the other running Windows Server. I purchased two single-domain Comodo certificates and am at the part to generate CSR's on the instances. I'm not sure what to put as "Server Name" on EC2. I would like each server to be accessible through a subdomain which I have forwarded on GoDaddy to the elastic IPs on EC2. For server name, do I use the elastic ip, the EC2 public dns, or the subdomain that I want? And which of these do I then place in my VirtualHosts file on Apache? The Windows instance is running IIS7 but the Apache box is priority.

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• VirtualBox Share permissions

  - by Eduardo Oliveira

  at the moment i'm running ubuntu server 12.04 on top of a virtual box running as service in M$ w7x64, I've configured the shares on fstab with E /media/E vboxsf auto,rw,uid=1000,gid=1000 0 0 the mount is ok drwxrwxrwx 1 knoker knoker 16384 Sep 1 20:02 E but i cant change the permissions inside of /media/E ,chmod runs but doesn't do nothing. on a specific case /media/E/Docs/Downloads i have dr-xr-xr-x 1 knoker knoker 163840 Sep 1 19:30 Downloads and since i cant seem to be able to change from linux i tried it on the windows, and all users listed have full control... Any ideas on what is happening? Best Regards, Knoker

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• initramfs - Unable to find a medium containing a live file system

  - by LittleBobbyTables

  I'm desperately trying to install ubuntu 12.10 64bit on my new Ultrabook. Its a Sony T13 with 8gb ram, 256gb ssd, i7, windows 8. I have an extra partition, D: "UBUNTU" already created with about 30gb space using FAT32. Ubuntu is MD5 checked, on a previously working USB stick using UNetBootin. Grub loads fine When I ask to test out Ubuntu ("Try ubuntu without installing") it shows the purple loading screen for a bit then brings up this error in a busybox terminal: initramfs - Unable to find a medium containing a live file system Things I've tried that don't work: Different versions of Linux (Fedora, Arch, SL, even gParted) Using USB2/3 - No difference Legacy or UEFI - different interface, but same error BIOS has no option for anything "ACHI" related I have read through tons of other people having this problem and diligently tried all the above solutions, with no luck.

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• Synaptic returns error

  - by donvoldy666

  I get the following error message when I run synaptic and I can't install any programs SystemError: W:Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension, W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ ' precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry ' 'http://extras.ubuntu.com/ubuntu'/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry' 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_ubuntu-mozilla-security_ppa_ubuntu_dists_precise_main_binary-i386_Packages), E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/packages.rssowl.org_ubuntu_dists_precise_main_i18n_Translation-en, E:The package lists or status file could not be parsed or opened. I'm new to Linux so please help me out .

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• How can I use the Windows key?

  - by torbengb

  The Windows key seems to not have any use in Ubuntu, but since I'm just coming from Windows I'm used to this key having some function. How can I make good use of the Windows key in Ubuntu? I've seen that I can remap keys in SystemPreferencesKeyboardLayoutOptionsAlt/Win key behavior, but I have no idea what the choices meta, super, hyper mean. The help button in this dialog doesn't give any specifics about them. I've experimented a little and found that meta seems to have some use, like Win+M = Me menu, or Win+S is the shutdown menu, but for some keys (B, I) it's more like Ctrl (bold, italic). Haven't found any further. What would a useful setting be for a Linux newbie?

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• My hardware needs a module to be blacklisted to work, how can I get this fix shipped?

  - by Jorge Castro

  I have an Acer Timeline 1830T. When I install 10.10 and 11.04 it needs to have the acer-wmi module blacklisted for wireless to work. I think I need to file a bug on the linux kernel but I am not sure. I've heard the term "quirk" being thrown around by developers when it comes to fixing something so that it works on certain pieces of hardware. Is this indeed a kernel bug? What steps should I take to ensure that this gets reported so that everyone with my laptop doesn't have to go through this over and over?

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• Typing tutor games with good playablity

  - by matt wilkie

  Are there any linux typing tutor games which are enjoyable games in their own right? I'm a computer professional, but have never learned to type properly. I also don't want my kids to pick up my bad habits! The kids are okay with TuxTyping, for a time. Something like Typing of the Dead sounds great, but is Windows only, and as far as I can tell one of a kind. I also don't want the young'uns hooked on first person shooters just yet. So are there any quality typing games for a range of ages?

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• Set up development site on another server/host

  - by Ofeargall

  I'm developing a site for a client. They've got a site now that's hosted at hosting.com. I'm going to move them to my VM hosting solution at edge web but I want to run some tests and have the client approve the site before changing the name servers to the new site/hosting location. How do I make this happen? I'm running a red hat/Apache on linux for the edge web hosting. I don't have control of the domain name (i.e. the client controls that right now). Edgeweb has set up a dns zone for the domain name so that when the time comes to switch we're ready to go. I'm a web developer and I understand the technologies that make a user experience 'work' but I'm unfamiliar with the server jargon and all that so, please be patient. Thanks in advance.

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• VMWare Fusion Folder Sharing Not Working with Server

  - by Dave Long

  I have a Ubuntu Server running in VMWare Fusion 3.1.2 on my MacBook Pro for Java development and all my projects sit on my Mac in ~/Workspace/ColdFusion. I had ColdFusion/ shared with my VM through the VMWare tools, and it was working perfectly up until friday when the folder sharing just stopped. No updates on either mac or linux besides an iTunes update. I tried uninstalling the VMWare tools and reinstalling them but I get an error at the end of the install. It appears that when I reinstall the tools there are files left over from the old installation. Is there a way to force the unsinstall script to completely uninstall and remove all files for the VMWare-Tools? I know the shared folder used to mount at /mnt/hgfs/ColdFusion.

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• What is "umask" and how does it work?

  - by Lekensteyn

  I believe that umask is something that controls file permissions, but do not fully understand it. After running umask 0644 in a terminal, I cannot read the files I create with the command-line text editor nano. I noticed that the permissions of that file are set to 0022 instead of the default 0755. How does umask work? I thought I could just remove the each digit in the umask from 0777, 7 - 6 = 1 and 7 - 4 = 3, so I expect the permissions to be 0133, but apparently, this is not the case. What is umask exactly? Explain it to me like I was a "Linux noob" How do I calculate with umask? What are use cases for umask?

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• Upgrade to Xubuntu 11.04 Breaks Wireless

  - by fleamour

  When I tried to connect at my mother's house and then my brother's house; the little connection icon would circle forever before eventually prompting for password. I have triple checked all network keys & then some. Even with my home network I now have to revert to 10.04 LTS Lucid Lynx (dual boot) or wired Ethernet. Not even sure where to start trouble shooting TBH? My card is a Edimax EW-7108PCg PCMCIA card which I bought for it's out the box Linux compatibility. Hardware is an IBM Thinkpad T21.

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• How to Use Windows 8's Storage Spaces to Mirror & Combine Drives

  - by Chris Hoffman

  “Storage Spaces” is a new feature in Windows 8 that can combine multiple hard drives into a single virtual drive. It can mirror data across multiple drives for redundancy or combine multiple physical drives into a single pool of storage. You can even create pools of storage larger than the amount of physical storage space you have available. When the physical storage fills up, you can plug in another drive and take advantage of it with no additional configuration required. Storage Spaces is similar to RAID or LVM on Linux. The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos

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• Live CD doesn't boot, drops to Busy Box shell

  - by D3c3nt Boy

  I am a Windows user and I'm keen to shift to Linux, so I made live CD of Ubuntu 10.10 (Maverick). This is my very first time to use Ubuntu. I put CD in the drive and set the BIOS to boot it, and the Ubuntu CD worked and logo of Ubuntu appears on screen. But suddenly before the start up screen it shows this: Busy Box v 1.5 (Ubuntu 1: 1.15.31 ubuntu5) built in shell (ash) enter help for a list of built in commands When I type help and press enter, the list of commands appear like below: alias break cd chdir command continue echo eval exec export ... This is my first time so i have no idea what to do. I restarted my pc several times but it happens every time. Please help me. What should I do?

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• How to check command line requests routed thru TOR?

  - by Chris

  I think I have virtualbox set up so that all traffic originating from the guest OS is routed through TOR. TOR is only installed on the host OS and the web browsers on the guest OS all report TOR IP's in Europe when I test with seemyip.com. The host OS shows my real IP when going to the same sites. But I initiate a lot of requests from the Linux command line and I haven't been able to confirm to my satisfaction that these are routing through TOR, though I have no reason to think they do not. When I use this command I get no output from the guest OS, but my real IP from the host OS: dig myip.opendns.com @resolver1.opendns.com +short This bash file gives no output from either OS: #!/bin/bash echo Your external IP Address is: wget http://Www.whatismyip.com -O - -o /dev/null | grep '<TITLE>' | sed -r 's/<TITLE>WhatIsMyIP\.com \- //g' | sed -r 's/<\/TITLE>//g' exit 0 Suggestions?

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