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• Should a programmer know Linux ?

  - by Maxtor

  I'm a PHP/Python programmer learning Java and C#(.NET). My main OS is windows 7 but I've used Linux and currently dual-booting with Ubuntu. My Linux knowledge however, is pretty limited. I can work with the command line on simple tasks but that's pretty much it. I don't do any shell scripting, don't know very well the most important commands, nor the system in general. My interests are web development, mobile apps and maybe some embedded stuff in the future. Should I get myself familiarized more with Linux ? Even if at the moment I'm not that interested in it? Is it a must for future job positions considering my field of interest? Thank you.

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• X technology is dead

  - by Daniel Moth

  Every so often, technology pundits (i.e. people not involved in the game, but who like commenting about it) throw out big controversial statements (typically to increase their readership), with a common one being that "Technology/platform X is dead". My former colleague (who I guess is now my distant colleague) uses the same trick with his blog post: "iPhone 4 is dead". But, his motivation is to set the record straight (and I believe him) by sharing his opinion on recent commentary around Silverlight, WPF etc. I enjoyed his post and the comments, so I hope you do too :-) Comments about this post welcome at the original blog.

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• Cannot Unbind Super Key from Unity

  - by Tom Thorogood

  Due to a graphics card compatibility issue using CrunchBang, I was told that my best option would be to move to 12.04 LTS. I'm trying to get everything configured and personalized the way I'm used to things, but am having some issues with unbinding default Unity shortcuts. I'm used to having all my shortcuts routed through the super key (T for Terminal, W for Web, Up for increased opacity, and so on). I've followed instructions to install compizconfig-settings-manager, and did an advanced search for all keyboard shortcuts binding to the super key, including the Unity shortcuts, but Unity still seems to listen for that keypress, and thus neither compiz nor the keybindings set up in system prefs - keyboard receive the commands I give them. (I did try also to simply change the unity launcher key instead of disabling it as shown below -- neither worked)

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• How do I create a permanent Bash alias?

  - by Bakhtiyor

  I would like to create an alias to rm command in order to have a confirmation message after executing this command. So I am creating an alias like this alias rm='rm -i'. But as far as I know this is a temporary alias and it lives until you close the terminal. As it is explained here to save alias permanently I need to execute ~/.bash_aliases or ~/.bashrc commands in terminal and add my alias there. But when I execute ~/.bashrc I get following error message : bash: /home/bakhtiyor/.bashrc: Permission denied When I run ~/.bash_aliases I get another error message like this: bash: /home/bakhtiyor/.bash_aliases: File or directory doesn't exist. What is the actual problem and how can I solve it?

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• Become a Linux Terminal Power User With These 8 Tricks

  - by Chris Hoffman

  There’s more to using the Linux terminal than just typing commands into it. Learn these basic tricks and you’ll be well on your way to mastering the Bash shell, used by default on most Linux distributions. This one’s for the less experienced users – I’m sure that many of you advanced users out there already know all these tricks. Still, take a look – maybe there’s something you missed along the way. How to Own Your Own Website (Even If You Can’t Build One) Pt 2 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?

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• Why doesn't `cd` work in a shell script?

  - by alex

  what is wrong with this easy script? I just want to write an script which change my directory: A. I put below commands on the file witch its name is pathABC on the /home/alex directory, #!/bin/sh cd /home/alex/Documents/A/B/C echo HelloWorld B. also I did chmod +x pathABC , On the terminal when I am on the /home/alex directory, I run ./pathABC . But the output is just HelloWorld and the current directory remains with no change. I mean my directory remains as /home/alex and not go to the /home/alex/Documents/A/B/C. So where is wrong?

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• Data binding directly to a store query (DbSet, DbQuery, DbSqlQuery) is not supported.

  - by Chandradev

  HiI was doing some test with code first approach in EF. Then while populating the Gridview i was getting error like thisData binding directly to a store query (DbSet, DbQuery, DbSqlQuery) is not supported. Instead populate a DbSet with data, for example by calling Load on the DbSet, and then bind to local data. For WPF bind to DbSet.Local. For WinForms bind to DbSet.Local.ToBindingList().For solving this error we have to write the code like this private void FillGrid()        {            using (var Context = new EmpDatabaseContext())            {                var query = Context.Emps.Select(m => m);                //var query = from m in Context.Emps                //            select m;               // Gridview1.DataSource = query;                Gridview1.DataSource = query.ToList();                Gridview1.DataBind();            }        }  We canot bind Iqueryable directly. We have to change into ToList()

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• Xubuntu dual monitor broke display

  - by Arman yaraee

  After I used Settings Display to enable my second monitor, my first display is not working anymore either. So I enabled both, then clicked save configuration since it was working and boom it crashed. Now when I start up, I can see the screen which I type my password but it goes black after that! When I boot into recovery mode it works fine but in Settings Display I don't see HDMI at all to disable it. Is there anyway to restore all display setting to default? (I can Ctrl+ALT+F1 and type commands but xrandr returns no results over there) EDIT I should clarify that system bios is set to laptop display

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• Canon Mx772 printer recognized, drivers loaded...but all print jobs "Held"

  - by user212169

  BRAND NEW to Ubuntu but loving it so far. I have a Canon MX772 wireless printing running on my network and am able to print fine from a PC and Mac. Using the printers IP, Ubuntu was able to find it and I accepted all of the "recommended" items (it found a Canon MX770 driver). Everything seems to load fine...but the test page does not print, nor does any print commands make it to the printer. If I open the print dialogue jobs are shown as "held" and when I look at the jobs attributes, I see "Job printer state message=cannot specify model number" and then a few lines down "job state reasons=aborted by system". If I try to "resume" it immediately goes back to "held". I can successfully ping the IP of the printer. Would be very appreciative of other ideas...printing is the last check in the box before I am all set up. Thanks!

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• Hash Sum Mismatch using preseed (Ubuntu Server 12.04)

  - by xorma

  My install through Preseed fails at around 80% on Select and Install Software. In VT-4, I can see Hash Sum mismatch errors. This may be because I am going through a firewall which is caching files. There is no-cache option for apt but I can't seem to get it to work with Preseed. Have tried: d-i debian-installer/no-cache string true d-i apt-setup/no-cache boolean true d-i preseed/early_command string mkdir -p /target/etc/apt/apt.conf.d; echo "Acquire::http {No-Cache=True;};" > /target/etc/apt/apt.conf.d/no-cache but none of these are working. It appears that the early_command occurs too early so is over written once install starts. I'm not sure if the other commands are even correct. Anyone know what is the correct way of disabling achieving this through Preseed?

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• If you can only read one book this year: Professional C# 4 and .NET 4 from wrox is the one.

  I just read the Professional C# 4 and .NET 4 from wrox, wrote by Christian Nagel, Bill Evjen, Jay Glynn, Karli Watson and Morgan Skinner. This is a complete book in whats in .NET 4 as well as a great book for anybody jumping in .NET. They did a great job including all the important parts of .NET as well as the new version 4. As I was reading, my first impression was how far .NET has gone since version 1.0, the different platforms including WPF, Silverlight, ASP.NET ADO.NET, LINQ and PLINQ now...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to Encrypt Your Home Folder After Installing Ubuntu

  - by Chris Hoffman

  Ubuntu offers to encrypt your home folder during installation. If you decline the encryption and change your mind later, you don’t have to reinstall Ubuntu. You can activate the encryption with a few terminal commands. Ubuntu uses eCryptfs for encryption. When you log in, your home directory is automatically decrypted with your password. While there is a performance penalty to encryption, it can keep private data confidential, particularly on laptops that may be stolen. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• Stupid Geek Tricks: How To Download Firefox On a New Computer Without Using Internet Explorer

  - by Chris Hoffman

  Internet Explorer-haters often say that the only good use for Internet Explorer is downloading Firefox or Chrome. But if you really don’t like IE, you can use Windows’ built-in FTP support to download and install Firefox without ever opening IE. Sure, you could just open Internet Explorer and download Firefox from Mozilla’s website, but where’s the geeky fun in that? This trick is about Firefox because Mozilla provides an FTP server, while Google doesn’t seem to. Downloading Firefox without using Internet Explorer may also come in handy if Internet Explorer is crashing and isn’t working properly on your system. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• 12.04: Having problem with REISUB

  - by Jerry-bliss

  Often my ubuntu freezes up altogether(only able to move my cursor). So i try to reboot using the keys "ALT+PrntScrn+REISUB", but this is what happens Once i finish hitting the keys RE, my screen goes BLACK and it shows up a few lines of commands (or whatever) which I dont understand. I have no other choice other than manually force shut down (by pressing power button for 3-4 seconds) Here is a screenshot of what my black screen displays as soon as I hit R,E What do these lines mean? Is there anyway I can safely restart my PC? (Since i was unable to use printscreen, i had to manually take a snap of my monitor using my camera. I had taken 3 pictures of the same screen, because I could not capture the entire text displayed on my screen in a single click)

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• Kernel Panic: Not booting after upgrade from 10.04 to 12.04

  - by Jitesh

  I upgraded from 10.04 to 12.04LTS. Upgrade went fine, even restarted couple of times. Then the next day while booting into Ubuntu, after the grub, it gave the error Kernel panic : not syncing vfs unable to mount root fs on unknown block (0,0). I then booted into live CD and tried the following commands, based on other posts on this forum: sudo fdisk -l As the 8 was on /dev/sda1, sudo mount /dev/sda1 /mnt sudo mount --bind /dev /mnt/dev Now I got the message: mount: mount point /mnt/dev does not exist Then tried sudo mount --bind /proc /mnt/proc Again got the message: mount point point /mnt/proc does not exist. then tried sudo chroot /mnt Got message: chroot: failed to run comman '/bin/bash': No such file or directory Now have no clue what to do next. Unable to boot into Ubuntu. Please help. Jitesh

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• Suspend after delay via SSH

  - by thornate

  I know how to suspend after a delay by using: echo 'pmi action suspend' | at now + 1 minutes However, that only seems to work as long as I keep the console window open. Am I correct in assuming that the at commands are cleared when I close the console? This is an issue as I want to be able to log in to my computer via SSH, send the suspend command, then log out before it happens. Suspending immediately tends to freeze my local console window, which is inconvenient. Is there a way to send a delayed suspend command without it being cleared when I log out?

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• A tour of the GlassFish 3.1.2 DCOM support

  - by alexismp

  While we've mentioned the DCOM support in GlassFish 3.1.2 several times before, you'll probably find Byron's DCOM blog entry to be useful if you're using Windows as a deployment platform for your GlassFish cluster. Byron discusses how DCOM is used to communicate with remote Windows nodes participating in a GlassFish cluster, what Java libraries were used to wrap around DCOM, what new asadmin commands were addd (in particular validate-dcom) as well as some tips to make this all work on your specific environment. In addition to this blog post, you should considering reading the official product documentation : • Considerations for Using DCOM for Centralized Administration • Setting Up DCOM and Testing the DCOM Set Up

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• Best C# database communication technique

  - by user65439

  A few days ago I read a reply to a question where people said that the days of writing queries within your c# code are long gone. I'm not sure what the specific person meant with the comment but it got me thinking. At the company I'm currently working at we maintain an assembly containing all the queries to the database (let's call it Queries), this assembly is reference by a QueryService (Retrieve the correct queries) assembly which in turn is referenced by a UnitOfWork assembly (The database connector classes, we have different connector classes for SQL, MySQL etc.). We use these three assemblies to perform operations on our database and all queries/commands are written in our C# code. Is there a better way to communicate with the database and is there a better way to communicate with different database types?

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• Setting up UPS monitoring

  - by Andrew Heath

  I have acquired a second hand Uninterrupted Power Supply (UPS) that I have refurbished (new battery) and hope to use with my Ubuntu 12.10 system. It's a SOLA 330 with serial out. I have installed NUT Metapackage and NUT Monitor from Software Centre, but am not sure how to go about setting it all up. A Google search brings up several ways of configuring Network UPS Tools (NUT) or HAL-Drivers, however, HAL-Drivers appears to be obsolete and many commands and config files mentioned to edit do not exist in 12.10 or the current version of NUT (most articles are a few years old). One tutorial seemed to work except the Error: no UPS definitions found in ups.conf even though ups.conf has values in it as laid out in the tutorial. How do I go about setting my system to monitor the UPS for a shut down signal? Also, is there a command to determine the UPS is communicating through the serial connection and on what port (to help with setup and configuring, eg. /dev/ttyS0 is mentioned in one of the tutorials I read).

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• How to reset .bashrc file which edited before to set PATH ANDROID sdk

  - by revan

  bash: export: `/home/entw/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local /bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/bin': not a valid identifier bash: /home/entw/.bashrc: line 111: unexpected EOF while looking for matching `"' bash: /home/entw/.bashrc: line 112: syntax error: unexpected end of file entw@entwine-desktop:~$ This is the error i frequently getting in terminal, shows when opend termianl. The following commands i applied in terminal, sudo gedit $HOME/.bashrc and added some path varable like android SDK, and run the following command source ~/.bashrc got the error in terminal bash: export: `/home/entw/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local /bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/bin': not a valid identifier bash: /home/entw/.bashrc: line 111: unexpected EOF while looking for matching `"' bash: /home/entw/.bashrc: line 112: syntax error: unexpected end of file entw@entwine-desktop:~$ but if i try to open agin that file shows the error file or directory not found. what do i do to set all correct ??, please any help? This forum i tried [forum]: http://forum.xda-developers.com/showthread.php?t=919425 "--point 2"

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• .Net Rocks TV - Architecting Windows Phone Applications

  - by psheriff

  I recently completed a .NET Rocks TV show with Carl Franklin. In this episode I discuss some design decisions that will help you create architecturally sound Windows Phone applications. Of course, many of the techniques will also apply to Silverlight and WPF application development as well. Check out the episode at http://www.dnrtv.com/default.aspx?showNum=184   Good Luck with your Coding,Paul Sheriff   ** SPECIAL OFFER FOR MY BLOG READERS **Visit http://www.pdsa.com/Event/Blog for a free video on Silverlight entitled Silverlight XAML for the Complete Novice - Part 1.

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• Obtaining In game Warcraft III data to program standalone AI

  - by Slav

  I am implementing common purpose behavioral algorithm and would like to test it under my lovely Warcraft III game and watch how it will fight against real players. The problem is how to obtain information about in game state (units, structures, environment, etc. ). Algorithm needs access to hard drive and possibly distributed computing, that's why JASS (WC3 Editor language) usage doesn't solve the issue. Direct 3D hooking is an approach, but it wasn't done for WC3 yet and significant drawback is inability to watch online at how AI performs since it uses the viewport to issue commands. How in game data can be obtained to a different process in a fastest and easiest way? Thank you.

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• Star Wars Roguelike Combines Star Wars and Old School ASCII Adventures

  - by Jason Fitzpatrick

  Mashup ASCII-based adventuring, Star Wars, and some sweet light saber sound effects, and you’ve got this old-school in-browser adventure game: Star Wars Roguelike. Play a Jedi or Sith and move about the ASCII world with simple keyboard commands. You’re not going to be blow away by the photo-realistic graphics, but you are going to be able to play it on your aging work computer. Hit up the link below to take the game for a spin. Star Wars Roguelike [via Boing Boing] How To Boot Your Android Phone or Tablet Into Safe Mode HTG Explains: Does Your Android Phone Need an Antivirus? How To Use USB Drives With the Nexus 7 and Other Android Devices

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• What are the benefits of designing a KeyBinding relay?

  - by Adam Naylor

  The input system of Quake3 is handled using a Keybinding relay, whereby each keypress is matched against a 'binding' which is then passed to the CLI along with a time stamp of when the keypress (or release) occurred. I just wanted to get an idea from developers what they considered to be the key benefits of designing your input system around this approach? One thing i don't particularly like is the appending of the timestamp to the bound command. This seems like a bit of a hack to bend the CLI into handling the games input? Also I feel that detecting the keypress only to add the command to a stream of text that gets parsed at a later date to be a slightly latent way of responding to input? (or is this unfounded?) The only real benefit i can see is that it allows you to bind 'complex' commands to keypresses; like 'switch weapon;+fire;' for example. Or maybe for journaling purposes? Thanks for any insights!

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• How to enable SMART?

  - by Pratik Koirala

  I want to conduct a SMART test on my drive but it was disabled. So, i used sudo smartctl -s on /dev/sda but the result was smartctl 5.41 2011-06-09 r3365 [i686-linux-3.2.0-26-generic] (local build) Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net === START OF ENABLE/DISABLE COMMANDS SECTION === Error SMART Enable failed: scsi error aborted command Smartctl: SMART Enable Failed. A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options. How to overcome this problem?

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