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  • What's shell script's advantage over interpreted programming languages?

    - by Lai Yu-Hsuan
    (I'm not sure if it's a appropriate question here) Shell script, like bash, can do many things. It can call Unix programs, pipe their output, redirect I/O from/to files, control flow, check whether a file exists, etc. But a modern programming language, e.g, python and ruby, can also do these all. And their are (I think) more readable and maintainable. bash is worldwide spreaded. But many distributions have installed python interpreter, too. So what's the advantage of shell script? If I could write python, ruby or perl, is it worth to learn bash?

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  • About partition sizes

    - by Lassi
    I am going to install Ubuntu on a new computer, but I'm not quite sure how big each partition should be. If I create only root, home and swap partitions, on what partition will programs be installed? Will they go to /home or to root? Basically does it make sense for instance to have following partitions: / - 6GB /home - 80GB /swap - 4GB Is 6GB large enough for my root partition? Also are these 3 partitions a good choice, or is there a better configuration? I have at the moment 3 operating systems installed, and I do make changes quite often.

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  • /var/lib/dpkg/lock.....help!

    - by Pycnopodia
    I had to reinstall the entire OS a little while ago and I have been trying to reinstall all of the programs I had before but I got a bit a of a problem now. I was trying to download dropbox from synaptic but it cannot finish the process and as a result I cannot update anything anymore. The line that comes out is: E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? I have tried: sudo apt-get install -f sudo apt-get -f install sudo rm /var/lib/dpkg/lock sudo apt-get -f update sudo dpkg --clear-selections sudo dpkg --configure -a But nothing seems to work. So is there a way to solve this?? Thanks

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  • Finding a job: feedback on my current prodicument and my relentless efforts [closed]

    - by Michael
    I am a very well rounded IT guy, with a passion for programming in particular. I have been through a BS program less the internship as I refuse to go lower than minimum wage (i.e. free) and/or such opportunities find the institution lacking. Since then, the catalog for my degree has changed, so I am making peace without it. I go up for job interviews and get myself no farther than a submitted resume. I have even changed my strategy and made this website: http://goo.gl/qqpN8 to showcase my highlights (but not at all exhaustive) for specific areas in the US and paid for classified ads. The 'internship' is notable as I am just trying to get my foot in the door. Because IT is so vast, with programming and engineering in particular, I spend my time researching the requirements for the job I am applying for. This has made me that well rounded guy I spoke of earlier, but has made me a victim of being a jack-of-all-trades; unfortunately being a master of none. I embrace my gung-ho attitude and find it to be a trait that has powered my career before. But I am starting to lose steam. I want it straight. What is not appealing about everything I am doing? What are the technologies that I need to focus on that are in great demand at the moment?

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  • unity player doesnt support my ubuntu so i cant play battalstar gallactica [closed]

    - by jrwhite3230
    ive been trying to install the unity player that supports battlestar gallactica online at big point.com /but then it is saying that my system (ubuntu) is not supported isnt there a patch by now because the game has been on for years now and there has been many people that i know running ubuntu who has the same difficulty ! also is there another program that would work with ubuntu and battlestar gallactica online?? there has to be a fix or ill just have to uninstall ubuntu/which is my next question how do i do that ??where is the control panel that allows you to uninstall programs within ubunty thank you very much for any support or advice [email protected]

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  • What are the factors that determine the default frequency of a shader call?

    - by user827992
    After i have been played for some days with various vertex and fragments shaders seems clear to me that this programs are called by the GPU at every and each rendering cycle, the problem is that I can't really quantify this frequency and I can't tell if is based on some default values or not because I don't have a big collection of hardware right now to do extensive tests. For what i know the answer could be really trivial like "it's the same of the refresh rate of your monitor", but i would like some good answers on that to be clear on this. For instance looks really odd to me that all the techniques used to control the amount of FPS that i have seen until now uses a call for the OpenGL function glutGet(GLUT_ELAPSED_TIME) to retrieve a value in ms about when the rendering started but I have to relies on the CPU to do the math. Why I can't set an FPS value in OpenGL if OpenGL clearly has a counter and a timer/clock? PS I'm referring to OpenGL 3.0+

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  • Ubuntu won't boot and it is stuck on the loading screen

    - by Jordan March
    I had just installed it as dual boot 2 days ago, and everything was fine. I was installing some programs (i think it was Play On Linux) and I don't think the install was 100% done when the battery died. Since then it won't boot into Ubuntu; it just stays at the loading screen. I did make separate partitions for boot root home and swap. Can anyone help me get it back and running again? Even if I have to reinstall it. I just don't want to go back through getting all those apps. I'm running Ubuntu 12.10 64bit on a Acer Aspire 5750 core i3 cpu 4gb ram

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  • How to fix Fullscreen focus error in Unity?

    - by Vagrant232
    Recently, I've been experiencing an error with programs that have a fullscreen mode with low resolution (80xx600 and below) in Unity. The problem isn't valid in gnomeshell. Whenever I launch an application, unity would enlarge the screen more than it should be and would only show me the upper left corner of the screen (I only see a magnified quarter of the screen). At first I thought that it was an issue related to wine but I later found out that native applications (such as world of goo) are affected as well. Apps that taken on the full screen but have a larger resolution don't face such an issue. Is it possible to get this fixed manually? Or do I have to wait for updates?

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  • Best Technologies for AJAX Web Development

    - by floatingfrisbee
    Hey Everyone, I have some experience in AJAX development, mostly on .NET and MooTools. However, I want to learn more and see what others out there thought about the various other options available. I am looking more for advise about the front end. The back end, I will most probably be coding up in .NET using c# and WCF services. Please feel free to provide me as much information as you can. Also I would appreciate any links to resources. List of Options (feel free to add) Write my own Javascript Use a frame work like MooTools, JQuery etc. Which one is better? Use Google Web Toolkit. Am I tying myself to limitations of GWT? Or are there not limitations? ASP.NET AJAX WPF (Will this run on non IE browsers?) Flash (it'll be a pain to learn action script) Thanks Jaspreet

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  • What are the tactics used to discover what kind of affiliate products will do well in your website?

    - by freethinker
    I'm starting to post some affiliate ads on my website. As it happens, I am not even close to making a sale. I'm not sure if the products I have chosen will appeal to the audience I have. I'm not sure if the volume of traffic is enough to support affiliate programs. I get about 8000-9000 visitors everyday. But since its growing constantly, thats not much of a worry. But I'm surely struggling to figure out what kind of products to market? (its a techie site). Is there a service/tool which can analyze the website and suggest what products will do well and what won't?

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  • How to refactor a myriad of similar classes

    - by TobiMcNamobi
    I'm faced with similar classes A1, A2, ..., A100. Believe it or not but yeah, there are roughly hundred classes that almost look the same. None of these classes are unit tested (of course ;-) ). Each of theses classes is about 50 lines of code which is not too much by itself. Still this is way too much duplicated code. I consider the following options: Writing tests for A1, ..., A100. Then refactor by creating an abstract base class AA. Pro: I'm (near to totally) safe by the tests that nothing goes wrong. Con: Much effort. Duplication of test code. Writing tests for A1, A2. Abstracting the duplicated test code and using the abstraction to create the rest of the tests. Then create AA as in 1. Pro: Less effort than in 1 but maintaining a similar degree of safety. Con: I find generalized test code weird; it often seems ... incoherent (is this the right word?). Normally I prefer specialized test code for specialized classes. But that requires a good design which is my goal of this whole refactoring. Writing AA first, testing it with mock classes. Then inheriting A1, ..., A100 successively. Pro: Fastest way to eliminate duplicates. Con: Most Ax classes look very much the same. But if not, there is the danger of changing the code by inheriting from AA. Other options ... At first I went for 3. because the Ax classes are really very similar to each other. But now I'm a bit unsure if this is the right way (from a unit testing enthusiast's perspective).

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  • How to better start learning programming - with imperative or declarative languages?

    - by user712092
    Someone is interested in learning to program. What language paradigm should I recomend him - imperative or declarative? And what programming language should he start with? I think that declarative because it is closer to math. And I would say that Prolog might be the best start because it is based on logic and programs are short. On the other hand at school we started learning from imperative languages and I am not sure whether there is a benefit to start with them instead of declarive ones. Thanks. :)

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  • How Is My Computer Able to Restart Itself?

    - by Jason Fitzpatrick
    It’s such a common place activity that most of us have likely never stopped to even think about it: the automatic restart. Whether user or application-initiated, what exactly happens when your computer cycles its own power? 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 Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer

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  • Workspeace view shows first workspaces out of border at left

    - by Jeremi Roivas
    I am using nvidia-current and edited from settings my monitors so that my second monitor is at left and unity-panel shows only in my main monitor. How ever now the workspaces images have shifted so that second monitor first workpsaces are moved out of the left border and when the monitor is not turn on I can't see the the workspaces there. Sometimes programs have been moved when monitor is been flashed to the workspace shown in out of border and I have no means to move the program windows into my main workspace views. Image: http://but.fi/2em As you see the second monitor works as it should work but my main monitor is fooked. Is this possible way to fix this some how?

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  • EASY: How does one release memory correctly in the attached C array?

    - by Tricky
    Hi, I'm just trying to work out why the following code is leaking memory and I have a funny feeling that i'm not releasing the array memory correctly. This is a C function in a wider objective-c app and I'm not native to C... i've tried just using free() on the array, but have a feeling this isn't the whole story... Could someone have a look and see what I'm missing here. Thanks! CFIndex theNumberOfSettings = 3; CTParagraphStyleSetting theSettings[3] = { {kCTParagraphStyleSpecifierAlignment, sizeof(CTTextAlignment), &alignment}, {kCTParagraphStyleSpecifierLineSpacing, sizeof(lineSpacing), &lineSpacing}, {kCTParagraphStyleSpecifierHeadIndent, sizeof(headIndent), &headIndent} }; CTParagraphStyleRef theParagraphRef = CTParagraphStyleCreate(theSettings, theNumberOfSettings); CFAttributedStringSetAttribute(attrString, CFRangeMake(0, CFAttributedStringGetLength(attrString)-1), kCTParagraphStyleAttributeName, theParagraphRef); CFRelease(theParagraphRef); free(theSettings);

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  • Make application automatically detect system language

    - by hakermania
    What should an application developed under a Linux System like Ubuntu do so as to automatically detect the system language? There are applications, like Liferea that automatically change their language to match the system's, without altering any preference of the program itself: Should this be the "default" behavior for all the programs? Should there be an option on the program so as to let the user choose the language nonetheless? Are all these translations coming along with the program itself? What if the user has set a system language not available in the translations of the program? Is this Ubuntu or most-linux-distros specific?

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  • Can't run TOR from terminal

    - by Thi G.
    So... I can't run TOR from my terminal. I have tried many different things, but I couldn't make it run. Once, it didn't stop to run when I wanted to. At my other attempt I also ended up failing because when it stopped to run I couldn't connect myself to the internet. I hope you can help me here guys. To be more specific, what I mean by "can't run from terminal" is that I can't hide my IP if I'm installing a program from terminal, for instance. Or if I'm running another program that is making a connection with the internet, my IP isn't being hidden. What I want is to make TOR work for all my programs. So my IP would be hidden in any connection with the internet.

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  • Bring the Windows 8 'Start Menu' back!

    - by ihaynes
    I've been using the the Windows 8 RTM from MSDN for a week but the more of my normal software I load onto the machine the more awkward it becomes using the new 'Metro' (yes I know that name is now not used) 'Start' screen. Yes, you can oraganise your programs in groups, or you can add them to the Quick Launch bar, or you can create alphabetic folders on the desktop but sorry Microsoft, none of these are as logical as the alphabetic Start menu of previous Windows versions.Fortunately the good people at Stardock have a solution in 'Start8', which brings the Start Menu we know and love back to Windows 8. It's still in Beta and the current one runs out in October. I'm looking forward to the final release and like lots of other users, I'll be happy to pay for this.Lets hope Microsoft either reinstate the Start Menu in the first service pack or gives us a usable alternative. In the meantime, here's an excellent solution.http://www.stardock.com/products/start8/

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  • How to install (or mock) Internet Explorer?

    - by Ivan
    I need to install a Windows application, which checks if there is Internet Explorer of at least 5th version installed and refuses to install (while I believe it does not really need it to work) if it is not. I've tried winetricks to install ie 8, 7, 6 full, 6 versions it offers - none worked - versions 7 and 8 installers report a function missing in msvcr (installing all msvcr versions didn't help), ie6 report some other error (I'll specify if it matters). I've also tried IEs4Linux - it also fails, complaining for a "BadIDChoice" X Window System error received by ies4linux-gtk.py. Is there a way to install any IE version in Ubuntu 10.10 with Wine or to mock its presence? I don't even need it to work, just to be installed in the Wine system so that other Windows programs could see it's there. I use Ubuntu 10.10 with Wine 1.3.8.

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  • How do I draw a dotted or dashed line?

    - by Gagege
    I'm trying to draw a dashed or dotted line by placing individual segments(dashes) along a path and then separating them. The only algorithm I could come up with for this gave me a dash length that was variable based on the angle of the line. Like this: private function createDashedLine(fromX:Float, fromY:Float, toX:Float, toY:Float):Sprite { var line = new Sprite(); var currentX = fromX; var currentY = fromY; var addX = (toX - fromX) * 0.0075; var addY = (toY - fromY) * 0.0075; line.graphics.lineStyle(1, 0xFFFFFF); var count = 0; // while line is not complete while (!lineAtDestination(fromX, fromY, toX, toY, currentX, currentY)) { /// move line draw cursor to beginning of next dash line.graphics.moveTo(currentX, currentY); // if dash is even if (count % 2 == 0) { // draw the dash line.graphics.lineTo(currentX + addX, currentY + addY); } // add next dash's length to current cursor position currentX += addX; currentY += addY; count++; } return line; } This just happens to be written in Haxe, but the solution should be language neutral. What I would like is for the dash length to be the same no matter what angle the line is. As is, it's just adding 75 thousandths of the line length to the x and y, so if the line is and a 45 degree angle you get pretty much a solid line. If the line is at something shallow like 85 degrees then you get a nice looking dashed line. So, the dash length is variable, and I don't want that. How would I make a function that I can pass a "dash length" into and get that length of dash, no matter what the angle is? If you need to completely disregard my code, be my guest. I'm sure there's a better solution.

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  • What are some good, simple examples for queues?

    - by Michael Ekstrand
    I'm teaching CS2 (Java and data structures), and am having some difficulty coming up with good examples to use when teaching queues. The two major applications I use them for are multithreaded message passing (but MT programming is out of scope for the course), and BFS-style algorithms (and I won't be covering graphs until later in the term). I also want to avoid contrived examples. Most things that I think of, if I were actually going to solve them in a single-threaded fashion I would just use a list rather than a queue. I tend to only use queues when processing and discovery are interleaved (e.g. search), or in other special cases like length-limited buffers (e.g. maintaining last N items). To the extent practical, I am trying to teach my students good ways to actually do things in real programs, not just toys to show off a feature. Any suggestions of good, simple algorithms or applications of queues that I can use as examples but that require a minimum of other prior knowledge?

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  • Is there a difference between multi-tasking and time-sharing?

    - by Dummy Derp
    Just going over my school notes, my teacher identifies multi-tasking OS, and time-sharing OS as two different things. I really don't see a difference between the two. MULTI-TASKING: You load a number of programs in the memory and execute them. You execute another program if the time quantum allocated to the current program expires OR if it goes on to do I/O and leaves the CPU OR if it finishes execution. TIME-SHARING: the same,again. The same applies in case of serial processing and batch processing. Although they are the same, I guess the only difference would be the way in which control information is passed to the CPU. Maybe, and again MAYBE, in serial processing you need to provide the punch cards with all the processes while in batch, the entire batch uses the same set of control information. Like all the print jobs would have the same control information.

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