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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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• System that splits passwords across two servers

  - by Burning the Codeigniter

  I stumbled upon this news article on BBC, RSA splits passwords in two to foil hackers' attacks tl;dr - a (randomized) password is split in half and is stored across two separate servers, to foil hackers that gained access to either server upon a security breach. Now the main question is, how would this kind of system would be made... codespeaking, for PHP which I commonly develop on my web applications, the database password is normally stored in a configuration file, i.e. config.php with the username and password, in that case it is understandable that the passwords can be stolen if the security was compromised. However when splitting and sending the other half to the other server, how would this go on when making a communication to the other server (keeping in mind with PHP) since the other server password would be stored in a configuration file, wouldn't it? In terms of security is to keep the other server password away from the main one, just exactly how would the main server communicate, without exposing any other password, apart from the first server. This certainly makes me think...

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• Harmful temptations in programming

  - by gaearon

  Just curious, what kinds of temptations in programming turned out to be really harmful in your projects? Like when you really feel the urge to do something and you believe it's going to benefit the project or else you just trick yourself into believing it is, and after a week you realize you haven't solved any real problems but instead created new ones or, in the best case, pleased your inner beast with no visible impact. Personally, I find it very hard to not refactor bad code. I work with a lot of bad legacy code, and it takes some deep breaths to not touch it when I have no tests to prove my refactoring doesn't not break anything. Another demon for me in user interface, I can literally spend hours changing UI layout just because I enjoy doing it. Sometimes I tell myself I'm working on usability, but the truth is just I love moving buttons around. What are your programming demons, and how do you avoid them?

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• Search the internet for a term selected in a text editor/viewer

  - by cipricus

  It seems possible (as I learned from a comment to this question made by user55822) to use Artha in order to search a term on the Internet by using "keybinding". What the aforementioned user says is that "you could search mouse selection anywhere by using an app like Artha, or by keybinding sh -c 'firefox "http://translate.google.com/#en/fr/$(xclip -o)"' (example given translate english into french)" A lot of things are obscure for me here. I could use Artha or keybinding (as alternative), or both? How to do that in each case? and "The command I gave you will open google translate in Firefox with your mouse selection (text highlighted) as a query. Use sh -c 'firefox "https://www.google.com/search?q=$(xclip -o)"' if you want regular Google over Google translate. And obviously, that would work everywhere" I do not know what to do with that formula. What should I do exactly? How to use it? In what application?

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• SEO issue - External links rel="nofollow" or NOT!

  - by Mary Melody

  Previously I created a website for promo codes and coupons. That have hundreds of external links to the Retailer's websites and I used rel="nofollow" tag. But my site SEO rank was very very... bad especially on Google. So then I removed the rel="nofollow" tag, but no improvement. The only difference between this site and my other sites is "External links". My other sites have good ranking on Google. Now I'm creating a site for reviews. So this is also similar situation for me. I just want to know about how does SEO react with external links? and then what possibly happened in my case?

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• How to name a method that both performs a task and returns a boolean as a status?

  - by Limbo Exile

  If there is a method bool DoStuff() { try { // doing stuff... return true; } catch (Exception ex) { return false; } } should it rather be called IsStuffDone()? Both names could be misinterpreted by the user: If the name is DoStuff() why does it return a boolean? If the name is IsStuffDone() it is not clear whether the method performs a task or only checks its result. Is there a convention for this case? Or an alternative approach, as this one is considered flawed? For example in languages that have output parameters, like C#, a boolean status variable could be passed to the method as one and the method's return type would be void.

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• How to secure Ubuntu for a non-technical user? (your mom)

  - by Gil

  My mother will be traveling for a while and I need to provide her with a secure laptop so she can work. A windows laptop is out of the question because: she'll be logging into dodgy hotel wireless networks and conference networks price of the windows license to install on a netbook I've installed libreoffice, media players and skype on it. Also enabled SSH so I can intervene but I am worried that I might not be in a position to do so. Possible threats: web browsing USB sticks insecure networks prone to intrusions malware SSH/VNC vulnerabilites Skype vulnerabilities All the "securing Ubuntu" guides out there assume the user has a certain level of technical knowledge but this is not the case with moms in general. If a malware can gain even user level access it might compromise her files.

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• How do I create a LiveUSB that lets me install any Ubuntu version?

  - by Dariopnc

  What I'd like to do: have Ubuntu installed on a USB drive and from there install any ubuntu version on a hdd. This is kinda different from using usb-creator because I'd like to have a persistent ubuntu install on the USB drive and not upgrade it every 6 months. From there I'd like to be able to install the most recent ubuntu version. I think it's just a matter of configuring ubiquity, but don't know if this is the case and how exactly do this. EDIT: Let's clarify the persistent thing: suppose I have my USB with ubuntu precise on it suppose quantal is out in the wild suppose that I want to install quantal on the hdd of a computer suppose that I want/can use only the USB drive with precise on it I should erase/upgrade precise on the USB drive to quantal and then install it on the hard drive I don't want to touch my ubuntu install on the USB drive, I'd like to be able to install the newer ubuntu version (quantal) on a hdd from another one (precise) on a USB drive I'd better avoid upgrading the installation on the hdd Hope this helps

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• Map, Set use cases in a general web app

  - by user2541902

  I am currently working on my own Java web app (to be shown in interview to get a Java job). So I've not worked on Java in professional environment, so no guidance. I have database, entity classes, JPA relationships. Use cases are like, user has albums, album has pics, user has locations, location has co-ordinates etc. I used List (ArrayList) everywhere. I can do anything with List and DB, get some entry, find etc. For example, I will keep the list of users in List, then use queries to get some entry (why would I keep them in Map with id/email as key?). I know very well the working and features, implementing classes of Map, Set. I can use them for solving some algorithm, processing some data etc. In interviews, I get asked have you worked with these, where have you used them etc. So, Please tell me cases where they should be used (DB or any popular real use case).

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• Window controls missing; Cannot maximise or minimize applications

  - by omg_scout

  Ubuntu 12.10 32 bits, fresh installation. How can I make Unity maximize or minimize a window? I see no button,option, anything, do I miss something big? Quick googling did not give me a piece of answer, too: On first screen, I have a terminal window. Only clue about maximizing it I found was pressing F11 which made it fullscreen, hiding left bar as well. I would prefer it to take whole free space instead of whole screen. How can I do that? On second screen, I have an opera browser which takes bigger part of the screen but I can't make it take whole screen. Restarting opera did not work. How do I minimize/maximize apps? Also, in case I would like to see the desktop, only solution I found was closing everything Help guys. I kind of like new GUI, but I can't have simplest tasks done there, I feel like I miss something big there.

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• HP 655 Notebook (Ubuntu 12.04) wireless internet disabled after running updates

  - by Bastian

  Today the update-manaeger suggested that I should download some updates. So I did. After the updates were installed I had to reboot the system. After the reboot my notebook doesn't see any wireless networks. I was looking for a long time on the internet for answers but non of them applies to my case. I have the idea, it has got something to do with the kernel I am currently using (Linux 3.2.0-55). Is this one new for Ubuntu 12.04? When I boot my system I can choose to use an older kernel (linux 3.2.0-32). When I use this one the notebook does see the wireless networks. This is my network card according to the command lspci: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe Anyone an idea to fix my problems with wireless internet?

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• Is it bad style to redundantly check a condition?

  - by mcwise

  I often get to positions in my code where I find myself checking a specific condition over and over again. I want to give you a small example: suppose there is a text file which contains lines starting with "a", lines starting with "b" and other lines and I actually only want to work with the first two sort of lines. My code would look something like this (using python, but read it as pseudocode): # ... clear_lines() # removes every other line than those starting with "a" or "b" for line in lines: if (line.startsWith("a")): # do stuff if (line.startsWith("b")): # magic else: # this else is redundant, I already made sure there is no else-case # by using clear_lines() # ... You can imagine I won't only check this condition here, but maybe also in other functions and so on. Do you think of it as noise or does it add some value to my code?

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• Webcast: SANS Institute Product Review of Oracle Identity Manager 11gR2

  - by B Shashikumar

  Translating the IT-centric, directory based view of access and authorization into the process-driven concerns of business users inevitably creates unique challenges. Enterprises struggle to determine which users have access to what resources and what they are doing with that access. Enforcing governance controls is critical to reduce the risk that an employee or malicious third party with excessive access will take advantage of that access. Dave Shackleford, SANS analyst, recently reviewed the User Provisioning capabilities of Oracle Identity Manager 11gR2. In this webcast, attendees will hear from Dave and other Oracle and customer experts on: The key challenges associated with implementing self-service user provisioning Oracle’s unique online “shopping cart” model for self-service access request Real world case study of user provisioning Best practices for deployment Register today, for this complimentary webcast, hosted by The SANS Institute. Attendees will be among the first to receive a new SANS Analyst Whitepaper on this subject. When: Thur Sep 27  9am PT/12p ET Where: Register here

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• Unity: Nautilus folder opens in background

  - by JJD

  I am used to open a folder from the keyboard with a shortcut. The alternatives are: Use Unity Dash with the shortcut SUPER + F to open the Dash File Lens Open Kupfer with the configured shortcut (CTRL + ALT + SPACE, in my case) Then I type the name of the folder and press ENTER if it is selected. However, the window that opens up is not active but in the background. I have to press ALT + TAB to bring it into foreground. I use Ubuntu Precise (12.04.). Question: How can I configure Ubuntu, Unity, Nautilus so newly opened windows become foreground immediately? Edit: This behavior only happens when another application is already open such as GEdit. It does not happen when the only other selectable entity is the Desktop.

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• How to support tableless columns with WYSIWYG editor?

  - by Andy

  On the front page of a site I'm working on there's a small slideshow. It's not for pictures in particular, any content can go in, and I'm currently setting up the editing interface for the client. I'd like to be able to have one/two/more columns in the editable area, and ideally that would be via CSS - does anyone know of a WYSIWYG editor that supports this? I'm using Drupal (would prefer not to involve Panels as it would require a bit of work to make it a streamlined workflow for content entry) in case that matters to anyone. To start the ball rolling, one way would be to use templates. I know CKEditor supports templates, and it looks like TinyMCE might have something similar. I don't know how well these work with tableless columns (the CKEditor homepage demo uses tables to achieve its two column effect). Holding out for a cool solution!

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• How to specify 'root' in path in text file

  - by DeanGrobler

  I'm following this tutorial located here on how to create a launcher for eclipse in unity. Everything is going pretty well so far, I've managed to successfully create the launcher but when I click on it, my system complains that the path to the exec is wrong. My exec for eclipse is located here: ~/opt/eclipse/eclipse And if you look at the tutorial you have to create a file and set it's contents like so: [Desktop Entry] Type=Application Name=Eclipse Comment=Eclipse Integrated Development Environment Icon=eclipse Exec=./opt/eclipse/eclipse Terminal=true Categories=Development;IDE;Java; In my case I have to provide the full location for the exec and there are a number of things that I tried that didn't work I set 'exec' to 'Exec=~/opt/eclipse/eclipse' , 'Exec=/opt/eclipse/eclipse' and 'Exec=root/opt/eclipse/eclipse' and none of these worked.. What should I set it to in order to fix the path so that my luancher works? Update------------------ I tried to list those 2 directories and what i get is this:

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• Unity-2D ALT F1,F2 custom configuration

  - by LGB

  I have been using Ubuntu since the first public version (I used Debian before). I always have had the policy to change between 8 workspaces with ALT F1...F8. I know this is not a "standard" or so, but I prefer this. It worked well with Unity (Unity-2D, I mean) too, after some configuration. But currently the odd thing happened that after a system restart this is not the case anymore, I am totally lost what could happened. Now ALT F3...F8 works, but not ALT-F1...F2, which just focuses launcher/dash, which is not the thing I want. I know this is the standard meaning of these key combinations (AFAIK) but defining my own key combinations worked before and now it stopped working ... If someone have any idea how to restore my custom configured meaning for ALT F1...F2 too, please share with me. Thanks!

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• Why is Android VM-based? [closed]

  - by adib

  By about 2004, it was clear that ARM is the clear winner for mobile CPUs, beating out MIPS, SH3, and DragonBall. PocketPC (Windows Mobile) applications was natively-compiled (at least most of them - except for .NET compact and its competitors). Likewise, Apple's iOS (named iPhone OS at the time) prefers natively-compiled applications. Then why Android chose a virtual machine based system stack? (the Dalvik VM). Wouldn't it be simpler to just compile applications down to ARM code using GCJ or something? Is the decision influenced by the J2ME-way of doing things, or was just because it's "cool"? Perhaps like most things Java, the culture that prefers multiple levels of indirection and abstractions, they just added another layer of abstraction for "just in case"?

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• NEW - Oracle Certifications and Documentation Available for Pre-Acquisition Sun/BEA Products

  - by PCat

  If you have been looking for Oracle certification information or documentation for the pre-Acquisition Sun/BEA products, such as WebLogic Portal (WLP) or WebCenter Interaction (WCI), formerly ALUI, you can now find them at the Certifications Central Hub.Use this Hub if you're looking for WLP/WCI documentation and certified configurations and more. Scroll down, below the bullets, to the bottom of the table to find: Of course, you can still find a great wealth of certification information for current products at this hub, as in the past. Be sure to check before you install! In case you haven't used this page before, notice that you can get to the documentation, certifications and downloads for WLP/WCI products by clicking on "WebLogic Portal" or "WebCenter Interaction" in the leftmost pane. In the new screen, you will see tabs for Overview, Downloads, Documentation and Community. Let us know if you don't find what you are looking for. Happy Trails.

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• What tools exist to report bugs

  - by Luis Alvarado

  As of today I only knew about ubuntu-bug which I could use to report bugs about a specific program. But now I learned about apport-collect and apport-bug which basically are: apport-bug - Reports problems to launchpad using Apport to collect a lot of information about your system to help the developers fix the problem and avoid unnecessary questions and answers. apport-collect - Works as apport-bug but it send the information to an already existing bug report. In my case it was apport-collect 1060268 Thanks to Brad Figg in Launchpad. Are there any other tools to report bugs?

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• Display current layout (language code/country flag) in keyboard indicator

  - by Jono

  Just upgraded from 10.04 to 10.10, and the keyboard indicator applet no longer displays the two-letter country code for the active layout. This is terrible. Is this the default behaviour? Anyone using two layouts can't tell which language they're in. I can't seem to find the setting for this, it used to be in the preferences for keyboard layout. Update 1: In case this wasn't obvious - I have two keyboard layouts - English and Hebrew. I just upgraded form 10.04, where the country code (USA/IL) was displayed, overlaid on the flag. Now all I get is a vague keyboard icon, and can't find the settings for this. Update 2: this seems to be a bug that people have been reporting since Lucid, and is now back in Maverick

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• How important is the unit test in the software development?

  - by Lo Wai Lun

  We are doing software testing by testing a lot if I/O cases, so developers and system analysts can open reviews and test for their committed code within a given time period (e.g. 1 week). But when it come across with extracting information from a database, how to consider the cases and the corresponding methodology to start with? Although that is more likely to be a case studies because the unit-testing depends on the project we have involved which is too specific and particular most of the time. What is the general overview of the steps and precautions for unit-testing?

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• How-To: AutoVue Bug Status Tracking & Email Notifications

  - by Graham McKendry

  I’ve posted a number of different Support process-related and tool-related blog entries over the past few years, and one common question I received back from various customers and partners is “How can I easily track AutoVue bugs & enhancements for status updates?” The capability to track bug status through the My Oracle Support (MOS) portal has existed in different forms for a while, although hasn’t necessarily been easy to find without going through specific segments of the extensive MOS training. Recently, the instructions were consolidated into the following highly recommended knowledge base article: KM Note 1298390.1 - How to Monitor a Bug from My Oracle Support The note covers various capabilities, including: How to add the new ‘Bug Tracker’ widget to your MOS dashboard How to add and manage bugs within the Bug Tracker and probably most interesting to MOS users... How to enable email notifications for bug status updates Make sure to pass this KM Note along to your MOS users in case they haven’t already configured this valuable feature.

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• Why can i download anything from the internet?

  - by Nicole

  I get this error message: Archive: /home/nicole/Downloads/iLividSetupV1.exe [/home/nicole/Downloads/iLividSetupV1.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /home/nicole/Downloads/iLividSetupV1.exe or /home/nicole/Downloads/iLividSetupV1.exe.zip, and cannot find /home/nicole/Downloads/iLividSetupV1.exe.ZIP. Why is ubuntu doing this?. I can no longer use my ipod, download songs, download software.

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• Do search engines rank internal redirects negatively?

  - by siverd

  A client is in the late stages (code complete) of a website redesign and unfortunately hasn't implemented 301 redirects to point high traffic pages to the new URL's. As I understand it our only option at this point is to create redirects within the CMS. Our CMS allows us to do this: www.mysite.com/category/current-page.html will redirect to www.mysite.com/new-category-name/new-page.html The site now uses custom logic on our 404 page to check this list of redirects and if one exists forwards the user to the new-page.html I understand that using 301 redirects would be the correct way to maintain our page rank but I think that would require a code change which isn't possible. Question How will search engines respond to this? Will they wait until the redirect happens and allow us to keep our page rank (authority, trust, etc) or will they see the 404 page and down-rank us? Worst case...will they make our new-page.html start from a rank of "0"? Thanks for your help.

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