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  • What programming languages have you taught your children?

    - by Dubmun
    I'm a C# developer by trade but have had exposure to many languages (including Java, C++, and multiple scripting languages) over the course of my education and career. Since I code in the MS world for work I am most familiar with their stack and so I was excited when Small Basic was announced. I immediately started teaching my oldest to program in it but felt that something was missing from the experience. Being able to look up every command with the IDE's intellisense seemed to take something from the experience. Sure, it was easy to grasp but I found myself thinking that a little more challenge might be in order. I'm looking for something better and I would like to hear your experiences with teaching your children to program in whatever language you have chosen to do so in. What did you like and dislike? How fast did they pick it up? Were they challenged? Frustrated? Thank you very much!

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  • What is a quick way to indent a block of text with spaces for use within a web browser?

    - by ændrük
    I occasionally have the need to indent a block of text with spaces for use within a web browser, for example, when formatting a code block on this site or in a post on Launchpad. So far I've just done it by hand by copying four spaces to the clipboard and then mashing keys really fast: ?, Home, Ctrl+V (repeat) What is a quicker way to accomplish this, e.g. copying and pasting to another program? a Firefox or Chrome browser extension? a command to directly modify the clipboard contents? an auto-typing program?

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  • set installer background / not able to run early_command in custom preseed file (precise)

    - by user73093
    I have a custom preseed file for a Precise Live CD (which is well loaded on boot, I checked syslog for that). My initial problem is that when booting in install mode (default behavior for a Live CD), ubiquity runs X with a default wallpaper which is hardcoded to /usr/share/backgrounds/warty-final-ubuntu.png in Ubiquity code. So my idea was to run early_command (https://help.ubuntu.com/12.04/installation-guide/i386/preseed-advanced.html) to copy my custom wallpaper over /usr/share/backgrounds/warty-final-ubuntu.png. Assuming my custom wallpaper allready resides on the rootfs in /usr/share/backgrounds. But... It seems the early_command never runs (and I'm sure the preseed file is taken into account) Here is what I have added to my preseed file: d-i preseed/early_command string cp /usr/share/backgrounds/mywallpaper-defaults.jpg /usr/share/backgrounds/warty-final-ubuntu.png Even this one is never run: d-i preseed/early_command string /usr/bin/touch /tmp/testearly Thanks for helping !!

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  • Parallelism implies concurrency but not the other way round right?

    - by Cedric Martin
    I often read that parallelism and concurrency are different things. Very often the answerers/commenters go as far as writing that they're two entirely different things. Yet in my view they're related but I'd like some clarification on that. For example if I'm on a multi-core CPU and manage to divide the computation into x smaller computation (say using fork/join) each running in its own thread, I'll have a program that is both doing parallel computation (because supposedly at any point in time several threads are going to run on several cores) and being concurrent right? While if I'm simply using, say, Java and dealing with UI events and repaints on the Event Dispatch Thread plus running the only thread I created myself, I'll have a program that is concurrent (EDT + GC thread + my main thread etc.) but not parallel. I'd like to know if I'm getting this right and if parallelism (on a "single but multi-cores" system) always implies concurrency or not? Also, are multi-threaded programs running on multi-cores CPU but where the different threads are doing totally different computation considered to be using "parallelism"?

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  • Remove/add indicator icons

    - by user209835
    I'm trying out Ubuntu 13.10. I would like to remove some of the default indicator icons in the upper right corner. Is there an easy way to do it? And then I would like to add some other icons (guake, pidgin, shutter, dropbox, kupfer etc.). I have already got the dropbox icon but it's in grey. I would like the default blue icon with the green marker. But if I change theme in ubuntu-tweak or gnome-tweak then the nice shutdown-icon disappears. In linux mint this just works :-).

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  • How do I teach bash in Ubuntu some curse words?

    - by NitinAb
    When bash encounters an unknown command(word?) it does this : The program 'hello' can be found in the following packages: * hello * hello-debhelper Try: sudo apt-get install <selected package> what I would like to know is how this is done so I can edit it or add something before it to cross check the unknown word from a home grown dictionary which would have phrase:reply pairs that can then be sent to output. I am guilty of not looking enough for it around .. but the few bash guides I tried digging up didn't have anything on this. Maybe I am looking at the wrong places .. any pointers? And yes I am doing this so every time I type wtf when a program fails , I want something nice thrown back at me...

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  • Can't fix broken packages

    - by AWE
    I am too dumb but determined to use Ubuntu that I paid a professional to install it for me (dualboot 11.10 with Win7). When I came home I got a lot of things from the software center. Skype did not have a download button so I googled it and Ubuntu help told me to do this: sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner" and then this: sudo apt-get update && sudo apt-get install skype The terminal told me "that this is potentially harmful..." but I thought it was Ubuntu language meaning "are you sure?" Now the computer is mute. Items cannot be installed or removed until the package catalog is repaired, so I want to repair it but the package operation fails. "sudo aptitude -f install" - command not found Synaptic package manager tells me that I have two broken packages, libc6 and libc6-dev so I do this: sudo apt-get update && sudo apt-get upgrade which tells me to do this: sudo apt-get -f install that ends up like this: Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16. Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17. Preconfiguring packages ... dpkg: warning: 'ldconfig' not found in PATH or not executable. dpkg: error: 1 expected program not found in PATH or not executable. Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. E: Sub-process /usr/bin/dpkg returned an error code (2) When fixing broken packages in synaptic package manager I get this: Preconfiguring packages ... dpkg: warning: 'ldconfig' not found in PATH or not executable. dpkg: error: 1 expected program not found in PATH or not executable. Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. E: Sub-process /usr/bin/dpkg returned an error code (2) A package failed to install. Trying to recover: dpkg: warning: 'ldconfig' not found in PATH or not executable. dpkg: error: 1 expected program not found in PATH or not executable. Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. I want to become a linux geek but it is harder than I thought. Please help!

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  • Run the Windows .net Application in System Tray on System Startup

    - by Rajneesh Verma
    Hi, Today i have created a .net windows application which has following key points. 1. Run only one instance of the project: to achieve this i have change the code of Program.cs as: Code Snippet static class Program { /// <summary> /// The main entry point for the application. /// </summary> [ STAThread ] static void Main() { bool instanceCountOne = false ; using ( Mutex mtex = new Mutex ( true , "MyRunningApp" , out instanceCountOne)) { if (instanceCountOne) { Application ...(read more)

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  • LSP vs OCP / Liskov Substitution VS Open Close

    - by Kolyunya
    I am trying to understand the SOLID principles of OOP and I've come to the conclusion that LSP and OCP have some similarities (if not to say more). the open/closed principle states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification". LSP in simple words states that any instance of Foo can be replaced with any instance of Bar which is derived from Foo and the program will work the same very way. I'm not a pro OOP programmer, but it seems to me that LSP is only possible if Bar, derived from Foo does not change anything in it but only extends it. That means that in particular program LSP is true only when OCP is true and OCP is true only if LSP is true. That means that they are equal. Correct me if I'm wrong. I really want to understand these ideas. Great thanks for an answer.

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  • Can I use a project code which has New BSD license but uses a GPL license library?

    - by Alok Kulkarni
    I want to use the ICSOpenVpn project source code in my commercial application. If we see the ICSOpenVpn project, it states that its license is New BSD but the libopenvpn.so library it uses is under GNU GPLv2 license. As per FAQ for version 2 of GNU GPL "If a library is released under the GPL (not the LGPL), does that mean that any program which uses it has to be under the GPL?" The answer says: "Yes, because the program as it is actually run includes the library." Also, how could ICSOpenVpn change the license to New BSD?

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  • Number crunching algo for learning multithreading?

    - by Austin Henley
    I have never really implemented anything dealing with threads; my only experience with them is reading about them in my undergrad. So I want to change that by writing a program that does some number crunching, but splits it up into several threads. My first ideas for this hopefully simple multithreaded program were: Beal's Conjecture brute force based on my SO question. Bailey-Borwein-Plouffe formula for calculating Pi. Prime number brute force search As you can see I have an interest in math and thought it would be fun to incorporate it into this, rather than coding something such as a server which wouldn't be nearly as fun! But the 3 ideas don't seem very appealing and I have already done some work on them in the past so I was curious if anyone had any ideas in the same spirit as these 3 that I could implement?

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  • Recent JSR Updates-JSR 356, 357, 355, 349, 236

    - by heathervc
    JSR 357, Social Media API, was not approved by the SE/EE EC to continue development in the JCP program. JSR 356, Java API for WebSocket, was approved by the SE/EE EC to continue development in the JCP program. JSR 355,  JCP Executive Committee Merge, published an Early Draft Review; this review closes 27 April.  You can read more about JSR 355 here. JSR 349, Bean Validation 1.1, published an Early Draft Review; this review closes 27 April. JSR 236,  Concurrency Utilities for Java EE, has updated the JSR page and moved to JCP version 2.8.

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  • JCP EC Nomination Materials for 2012

    - by heathervc
    The nomination period of the 2012 Annual JCP EC Elections will begin at the end of September 2012.  The JCP will be accept self-nominations for 2 seats on what will become the merged JCP EC, starting 28 September, with the nomination period ending on Thursday, 11 October. JCP Members (JSPA 2 primary contacts) will receive messages with instructions for nominating and their login credentials via email.  You will need this credential information to login and complete the nomination.The JCP EC Special Election schedule is posted online in the JCP calendar, highlights are below:Nominations for elected seats: 28 September-11 OctoberBallot (ratified and elected): 16-29 OctoberNew members take office: 13 November The ballot with nominees for ratified and nominated seats begins on 16 October. The results will also be available on jcp.org on 30 October. If you are attending JavaOne 2012 in San Francisco, there are several events happening that you may be interested in attending, in particular the following BOF session.Meet the JCP Executive Committee CandidatesSession ID: BOF6307Location: Hilton San Francisco - Golden Gate 3/4/5Date and Time: 10/2/12, 4:30 PM - 5:15 PM We will also be hosting a call for all of the candidates following the nomination period.  The following information is required for self-nomination.1) Contact information/Biography Each EC seat is represented by two people - a primary and alternate representative. Provide the following information for each representative: - Name - Title - Email Address - Mailing Address - Phone Number - Fax - A brief biography (3-5 sentences/~100-200 words) for primary contact - Photograph (prefer jpg format, head only shot) for primary contactBios and photos for the EC members are posted here:http://jcp.org/en/press/news/ec-feature_MEhttp://jcp.org/en/press/news/ec-feature_SE2) Qualification StatementA brief (2-3 paragraph) description of your qualifications for an EC seat; this is a Qualification Statement for the organization you represent. It should include the value and perspective you bring to the EC, your interests in the JCP program, as well as a summary of your current participation or planned participation in the JCP program (your entire organization)--JSRs, participation on Expert Groups, meetings/events attended, etc.  This statement will appear on the ballot and will convince community members that they should vote for you, so please include relevant information about your experience within the JCP program and your investments in Java technology.A few sample qualification statements are available here.3) Position PaperOne of the pieces of information we make available to the JCP membership for voting purposes is a position paper.  If you would like to provide this type of information for the ballot, please prepare in pdf format for posting.  This would be more detail on areas that you would put focus into during your tenure on the JCP EC.You can read more about some of the topics under discussion in the EC here, including links to JCP.Next materials. If you have an interest in participating in the JCP EC, please start preparing these materials now.  We look forward to a successful election process.

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  • Web and Flex developer career question [closed]

    - by abhilashm86
    Possible Duplicate: should i concentrate on logical and puzzles part in programming, i want to be a web (flex)developer? I'm a computer science student and have been learning Flex and Actionscript 3.0 for 4 months. I know it's easy to program in MXML, and Actionscript 3.0 is pretty easy with bunch of classes, but when I try to code in C++ or C, I struggle, I feel I'm being inefficient and it scares me. Since I'm a student, I've no experience in developing algorithms and tough program solving? I'd like to be a web developer. Does a web developer need strong fundamentals when it comes to things such as complex algorithms and high end coding?

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  • Is case after case in a switch efficient?

    - by RandomGuy
    Just a random question regarding switch case efficiency in case after case; is the following code (assume pseudo code): function bool isValid(String myString){ switch(myString){ case "stringA": case "stringB": case "stringC": return true; default: return false; } more efficient than this: function bool isValid(String myString){ switch(myString){ case "stringA": return true; case "stringB": return true; case "stringC": return true; default: return false; } Or is the performance equal? I'm not thinking in a specific language but if needed let's assume it's Java or C (for this case would be needed to use chars instead of strings).

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  • How to config multiple monitor with optimus?

    - by irrational
    I have an Acer Aspire 8951G running 12.04 Pangolin with bumblebee working beautifully. My problem is that when I connect either the VGA port or the HDMI to my projector there is no way I can see to properly set up the resolutions or colours. The default basic display driver sees the projector correctly, but messes up colours and resolutions (on hdmi) and resolutions on VGA. (Its a 1280 X 720 projector) Am I missing some sort of Xorg configuration? nvidia-xconfig does not seem to exist and running optirun nvidia-settings -c :8 opens the settings, but of course only for the one display. I just want a way to set a default config for my projector via VGA or preferably HDMI. Any help would be wonderful.

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  • How important is Programming for a Level Designer?

    - by WryGrin
    I'm currently attending school in a Level Design program, and I was wondering how important programming really is in being a Level Designer? I'm apparently incapable of learning programming (despite my best efforts), and tend to do very well in all other courses 3D modelling, story/character design, narrative and dialogue writing, environmental and conceptual design etc. I'm wondering if my strengths in the other areas are enough (with practice) to let me become a Level Designer, or I'm wasting my time if I can't program? I really want to be a Designer, but I just can't seem to wrap my head around the "language" of programming in general (Java kicks my teeth in even with tutoring and additional work on my own).

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  • Xorg.conf (nvidia) Second Monitor getting settings of first

    - by HennyH
    I've been spending the weekend (and some time before that) trying to set up my Korean QHD270 and Benq G2222HDL monitors with Ubuntu 13.10. With the nouveau drivers install both monitor function perfectly fine. After installing the nvidia drivers the Benq works but the QHD270 does not. Now, after days of struggling I managed to get the QHD270 to work following a mixture of blogs, particularly; this one and learnitwithme. Now, unfortunatly my G2222HDL does not work. I fixed the QHD270 by supplying a custom EDID, my xorg.conf looks like so (excluding keyboard and mouse): Section "ServerLayout" Identifier "Layout0" Screen "Default Screen" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Section "Device" Identifier "Configured Video Device" Driver "nvidia" Option "CustomEDID" "DFP:/etc/X11/edid-shimian.bin" EndSection Section "Screen" Identifier "Default Screen" Device "Configured Video Device" Monitor "Configured Monitor" EndSection Now, I tried defining a new Device,Monitor and Screen then in ServerLayout adding Screen "Second Screen" RightOf "Default Screen", but after doing so neither monitor worked. Hoping to fix the issue using a GUI based tool I opened up NVIDIA X Server Settings, which shows my current layout as: It seems that something is being output to the monitor, as suggested by my print screen: Any help would be greatly appreciated. Output of xrandr: Screen 0: minimum 8 x 8, current 5120 x 1440, maximum 16384 x 16384 DVI-I-0 disconnected (normal left inverted right x axis y axis) DVI-I-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 60.0*+ HDMI-0 disconnected (normal left inverted right x axis y axis) DP-0 disconnected (normal left inverted right x axis y axis) DVI-D-0 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 60.0*+ DP-1 disconnected (normal left inverted right x axis y axis) And an extract from my log file (perhaps this is relevant?) [ 7.862] (--) NVIDIA(0): Valid display device(s) on GeForce GTX 680 at PCI:2:0:0 [ 7.862] (--) NVIDIA(0): CRT-0 [ 7.862] (--) NVIDIA(0): ACB QHD270 (DFP-0) (boot, connected) [ 7.862] (--) NVIDIA(0): DFP-1 [ 7.862] (--) NVIDIA(0): DFP-2 [ 7.862] (--) NVIDIA(0): DFP-3 [ 7.862] (--) NVIDIA(0): DFP-4 [ 7.862] (--) NVIDIA(0): CRT-0: 400.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): ACB QHD270 (DFP-0): 330.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): ACB QHD270 (DFP-0): Internal Dual Link TMDS [ 7.862] (--) NVIDIA(0): DFP-1: 165.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS [ 7.862] (--) NVIDIA(0): DFP-2: 165.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): DFP-2: Internal Single Link TMDS [ 7.862] (--) NVIDIA(0): DFP-3: 330.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): DFP-3: Internal Single Link TMDS [ 7.862] (--) NVIDIA(0): DFP-4: 960.0 MHz maximum pixel clock [ 7.862] (--) NVIDIA(0): DFP-4: Internal DisplayPort

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  • How to fix the apt-get -f install error [duplicate]

    - by Satish Patel
    This question already has an answer here: How do I fix a “Could not get lock /var/lib/dpkg/lock” problem? 12 answers I am getting continuous error when I run the command sudo apt-get -f install The output of the command is as follows: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: default-jre-headless icedtea-7-jre-jamvm openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib Suggested packages: fonts-ipafont-gothic fonts-ipafont-mincho ttf-telugu-fonts ttf-oriya-fonts ttf-kannada-fonts ttf-bengali-fonts The following NEW packages will be installed: default-jre-headless icedtea-7-jre-jamvm openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib 0 upgraded, 5 newly installed, 0 to remove and 28 not upgraded. 2 not fully installed or removed E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/cache/apt/archives/ satish@satish-Inspiron-N5010 ~ $ please guide ASAP

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  • Python 2.4 on Ubuntu 12.04

    - by veepsk
    I want to develop a Python application on Ubuntu 12.04 using python 2.4, but since the default version of python on ubuntu is 2.7. I cannot get the libraries and packages to work for python 2.4. I have tried using virtualenv but even with virtualenv I was not successful in installing packages for python2.4. So I would like to know if there is any reliable method to get python 2.4 to work with Ubuntu. I know that I shouldnt mess with the default version of python on ubuntu and hence I am looking for a better alternative. Thanks in advance.

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  • Setup Convergence Address Book DisplayName Lookup

    - by user13332755
    At Convergence Address Book the default lookup for 'Display Name' is the LDAP attribute 'cn', which leads into confusion if you start to setup 'displayName' LDAP attributes for your users. LDAP User Entry with diaplyName attribute: This behavior can be controlled by the configuration file xlate-inetorgperson.xml. Change the default value of XPATH abperson\entry\displayname from 'cn' to 'displayName'. <convergence_deploy_location>/config/templates/ab/corp-dir/xlate-inetorgperson.xml Note: In case the user has no 'displayName' attribute in LDAP you might noticed '...' at the user entry, if found via 'mail' attribute.

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  • "AND Operator" in PAM

    - by d_inevitable
    I need to prevent users from authenticating through Kerberos when the encrypted /home/users has not yet been mounted. (This is to avoid corrupting the ecryptfs mountpoint) Currently I have these lines in /etc/pam.d/common-auth: auth required pam_group.so use_first_pass auth [success=2 default=ignore] pam_krb5.so minimum_uid=1000 try_first_pass auth [success=1 default=ignore] pam_unix.so nullok_secure try_first_pass I am planning to use pam_exec.so to execute a script that will exit 1 if the ecyptfs mounts are not ready yet. Doing this: auth required pam_exec.so /etc/security/check_ecryptfs will lock me out for good if ecryptfs for some reason fails. In such case I would like to at least be able to login with a local (non-kerberos) user to fix the issue. Is there some sort of AND-Operator in which I can say that login through kerberos+ldap is only sufficient if both kerberos authentication and the ecryptfs mount has succeeded?

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  • time it takes to develop 4*N lines of code. Nonlinear, but how nonlinear ?

    - by Andrei
    It took me time T to develop program A, 1000 lines of code (SLOC), in certain language/area/complexity. Then how much time it will take to develop program B which is expected 4000 lines, in same area/complexity/language ? I expect it to be 4*N, right ? Any formula how T grows with SLOC ? For contractor, these estimates are important. Is there formula from software enginering books, or from people's experience ? Also, what methods exist to make the code bug-free before it hits QA ?

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  • apache permissions problem

    - by nishan
    Im running ubuntu 12.04 lts 2gb ram 500gb hdd. My hdd have 4 partitions. Partition 1 = 40 gb Windows (NTFS, lable = win32) Partition 2 = 320 gb Windows (FAT label = common) Partition 3 = 40 gb Ubuntu (EXT4) I installed apached2 now to change its default www directory, I used 'gksu gedit /etc/apache2/sites-enabled/000-default' and chaged to /media/common/www After all I run in terminal chmod 777 /media/common/www chmod 777 /media/common/www/. After that I type in firefox 127.0.0.1/index.php It says "Forbidden You don't have permission to access / on this server. Apache/2.2.22 (Ubuntu) Server at 127.0.0.1 Port 80" Before my changes it was working fine. How should i run my websites???

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