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• Why can't I get a working session with vnc4server

  - by ysap

  We have a couple of (identical) Ubuntu 11.10 machines, configured with gnome-classic, which we use as remote servers, and let our clients log into personal user accounts we create for them using vnc4server. We configured all the machines in the same way, following a short manual we compiled, describing how to download, install and prepare a few tools and our software. The connection usually works fine, but today I set up a fresh machine, and experienced problems. After installing vnc4server, I ran vncpasswd and copied the following startup file to ~/.vnc/xstartup: #!/bin/sh unset SESSION_MANAGER unset DBUS_SESSION_BUS_ADDRESS gnome-session --session=gnome-classic & [ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources xsetroot -solid grey vncconfig -iconic & Then, I started vnc4server and used two viewers (the Ubuntu Remote Desktop Viewer and Windows RealVNC Client) in two other machines, but instead of getting my desktop, I see an empty window with a grey-ish background pattern like this: and the cursor is a bold X. What is wrong with the setup and why don't I get a remote session as expected?

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• Why should a class be anything other than "abstract" or "final/sealed"

  - by Nicolas Repiquet

  After 10+ years of java/c# programming, I find myself creating either: abstract classes: contract not meant to be instantiated as-is. final/sealed classes: implementation not meant to serve as base class to something else. I can't think of any situation where a simple "class" (i.e. neither abstract nor final/sealed) would be "wise programming". Why should a class be anything other than "abstract" or "final/sealed" ? EDIT This great article explains my concerns far better than I can.

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• Why is this by passing the SUDO password?

  - by John Isaacks

  I have a bash script I am using to automate a SVN checkout. The contents of the file were: #!/bin/bash cd /var/www-cake sudo svn checkout file:///usr/local/svn/bash_repo/repo/ Then when I double click the file it would ask me what to do, I would click the button "Run In Terminal" and then a terminal would pop up and ask me for the SUDO password. I would enter it, the script would execute and the terminal would close. I wanted to give some sort of indication that the script ran successfully so I edited my file to look like: #!/bin/bash cd /var/www-cake sudo svn checkout file:///usr/local/svn/bash_repo/repo/ echo "Head revision has been pushed to live server" I expected the terminal to now stay open and tell me the message afterwards. To my surprise it now opens and immediately closes. The script does execute and I no longer have to put in the SUDO password. Is this right? I do not understand why this is happening, seems like a security issue.

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• Why is a linked list implementation considered linear?

  - by VeeKay

  My apologies for asking such a simple question. Instead of posting such basic question in SO, I felt that this is more apt a question here. I tried finding an answer for this but none of them are logically appealing or convincing to my understanding. Typically, computer memory is always linear. So is the term non linear used for a data structure in a logical sense? If so, to logically achieve non linearity in a linear computer memory, we use pointers. Right? In that case, if pointers are virtual implementations for achieving non linearity, Why would a data structure like linked list be considered linear if in reality the nodes are never physically adjacent?

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• Reasons why crontab does not work

  - by Adam Matan

  Many a time and oft, crontab scripts are not executed as expected. There are numerous reasons for that, for example: wrong crontab notation, permissions, environment variables and many more. This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer. Please include one reason per answer - details about why it's not executed - and fix(es) for that one reason. Please write only cron-specific issues, e.g. commands that execute as expected from the shell but execute erroneously by cron.

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• Why will Google Analytics not allow our URL?

  - by Linda H

  In Google Analytics we're trying to add a property for each website of a WordPress multisite network. It works well for all of the sub-site but one. In the Default URL field we used the following: www.mywebsite.no/ - works www.mywebsite.no/nurse - works, as does a few other sub-sites www.mywebsite.no/doctor - doesn't work In the last case we get the following error: Value is not a valid domain. (e.g. example.com, www.example.com) We can't change the name of the sub-site but GA just won't accept the URL. Why is this and what can we do to solve this?

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• Why make JavaScript class based?

  - by Carnotaurus

  JavaScript is a prototype language. To turn it into a class based language adds little value? I am not talking about best-practice here. I remember reading an article from way back, which claimed that the class-based worldview is perceivably more flawed than the one of prototypes. My summary can be found here: http://carnotaurus.tumblr.com/post/3248631891/class-based-javascript-or-not. I am resisting to use the class-based jQuery add-on and other attempts at faciliating class-based JavaScript. Peer pressure is strong but is there a stronger theoretical or practical reason why I stop resisting?

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• Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

  - by Chris Hoffman

  The “Do Not Track” option is enabled by default in Windows 8’s Internet Explorer 10 and available in Firefox, Safari, and Opera. Google is even adding it to Chrome. There’s just one problem: it doesn’t actually prevent tracking. The Do Not Track check box can provide a false sense of security. While a few websites will pay attention to it, the vast majority of websites will ignore your preference. Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference

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• Why isn't LISP more widespread?

  - by Andrea

  I am starting to learn Scheme by the SICP videos, and I would like to move to Common Lisp next. The language seems very interesting, and most of the people writings books on it advocate that it has unequalled expressive power. CL seems to have a decent standard library. Why is not Lisp more widespread? If it is really that powerful, people should be using it all over, but instead it is nearly impossible to find, say, Lisp job advertisements. I hope it is not just the parenthesis, as they are not a great problem after a little while.

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• Why does Google Analytics show false referrals?

  - by Peter Merrill

  Ever since Google revamped their Analytics interface I've been noticing a weird "bug" while viewing the "Real-Time" overview area. From this area I can obviously see live stats of visitors to my website but when I visit my website by opening a new tab (Chrome) and manually visit website the real time stats sometimes look like the image linked below. http://i.stack.imgur.com/mfniY.png Is there any reason why Google is saying that I was referred by Stack Overflow when I'm visiting my website from a new tab? Could this be something do to with how I installed the analytics on my site or could this be an issue with browser cookies? Have anyone else noticed this? I am mainly concerned about this because in the standard reporting area of my Analytics panel my referral stats are getting thrown off every time I visit my own website.

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• Discover Why Computer Shut Down

  - by kzh

  I was at school SSHing to my homebox. All of a sudden, my connection was closed. Attempting to reconnect failed. When I returned home, I discovered that my computer was off. Nobody was at my house and I am sure that I did not have a power outage. How can I figure out how or why my computer shut off? Is there some log in /var/log that could point me in the right direction? Should there be a core dump somewhere that I should find? If so, how do I use core dumps?

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• Why do we need REST service security if we have HTTPS

  - by Vangel

  I refer to this excellent article http://www.thebuzzmedia.com/designing-a-secure-rest-api-without-oauth-authentication/ which speaks of amazon like security for web service. However I was asked a question in the team of why do we need it if we already use HTTPS. I was unable to answer as it really seems to me they may be right although gut tells me otherwise. Also is there places when providing REST services where HTTPS may not work? Like 3rd party websites? If anyone has experience in securing Web Services over the public interwebs please shed some light with your experience. Thanks in advance. EDIT: To clarify I am not speaking of user authentication but more of client authentication. The user authentication can be assumed to be plain text over HTTPS+ REST. My worry is that this still allows anyone to use the web service without my client to access it since everything is plai text although over HTTPS the client end point can still use my web service without the client application.

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• Why Nodes.js being that "unique"?

  - by Adrian Shum

  Recently years there are lots of praise to Nodes.js. I am not a developer that have much exposure on network application. From my bare understanding of Nodes.js, its strength is: We are having only on thread handling multiple connections, providing a event-based architecture. However, for example in Java, what if I am having only one thread, using NIO/AIO (which is non-blocking APIs from my bare understanding), and handle multiple connections using that thread, and I provide an event-based architecture to implement the data handling logic (shouldn't be that difficult by providing some callback etc) ? Given JVM being a even more mature VM than V8 (I expect it run faster too), and event-based handling architecture seems not something difficult to create. I am not sure why Nodes.js is attracting so much attention. Did I miss some important points?

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• Reasons why crontab does not work

  - by Adam Matan

  Many a time and oft, crontab scripts are not executed as expected. There are numerous reasons for that, for example: wrong crontab notation, permissions, environment variables and many more. This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer. Please include one reason per answer - details about why it's not executed - and fix(es) for that one reason. Please write only cron-specific issues, e.g. commands that execute as expected from the shell but execute erroneously by cron.

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• Why is Google still not indexing my !# website?

  - by Zubair

  I have been working on a website which uses #! (2minutecv.com), but even after 6 weeks of the site up and running and conforming to the Google hash bang guidelines stated here, you can still see that Google still hasn't indexed the site yet. For example if you use Google to search for 2MinuteCV.com benefits it does not find this page which is referenced from the homepage. Can anyone tell me why Google isn't indexing this website? Update: Thanks for al lthe help with this answer. So just to make sure I understand what is wrong. According to the answers Google never actually indexes the pages after the Javascript has run. I need to create a "shadow site" which google indexes (which google calls HTNL snapshots). If I am right in thinking this then I can pick a winner for the bounty

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• Why is Lubuntu default desktop environment

  - by John

  So I just wanted to try things out on 14.04, so I did sudo apt-get install lxde sudo apt-get install lubuntu-desktop When I get to the greeter, it reads Lubuntu (Default) Lubuntu Netbook LXDE Openbox Ubuntu Why is Lubuntu default? I don't know if its because its the last thing I installed or if its because it is in alphabetical order. I'm tempted to test this theory by installing Xubuntu and see if it becomes default. I'd like it to read Ubuntu (Default) and have the Ubuntu splash instead. When I open lightdm.conf, there is no line "user-session" nor "greeter-session". They are missing. Is this normal and I have to add it manually?

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• Why don't more companies hire remotely?

  - by James

  I keep hearing about the desperate recruiting efforts of companies in tech hubs such as SF and NYC. However, every time I'm contacted by a startup I'm told the position is on-site and working remotely isn't possible. Let me clarify that these are tech startups. They should be very comfortable with the idea of using technology to get things done and connect teams together. With the housing market the way it is, many of us can't relocate even if we wanted to pay the higher cost of living. Why are so many companies still stuck in the industrial mindset of butts in seats?

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• About floating point precision and why do we still use it

  - by system_is_b0rken

  Floating point has always been troublesome for precision on large worlds. This article explains behind-the-scenes and offers the obvious alternative - fixed point numbers. Some facts are really impressive, like: "Well 64 bits of precision gets you to the furthest distance of Pluto from the Sun (7.4 billion km) with sub-micrometer precision. " Well sub-micrometer precision is more than any fps needs (for positions and even velocities), and it would enable you to build really big worlds. My question is, why do we still use floating point if fixed point has such advantages? Most rendering APIs and physics libraries use floating point (and suffer it's disadvantages, so developers need to get around them). Are they so much slower? Additionally, how do you think scalable planetary engines like outerra or infinity handle the large scale? Do they use fixed point for positions or do they have some space dividing algorithm?

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• Case convention- Why the variation between languages?

  - by Jason

  Coming from a Java background, I'm very used to camelCase. When writing C, using the underscore wasn't a big adjustment, since it was only used sparingly when writing simple Unix apps. In the meantime, I stuck with camelCase as my style, as did most of the class. However, now that I'm teaching myself C# in preparation for my upcoming Usability Design class in the fall, the PascalCase convention of the language is really tripping me up and I'm having to rely on intellisense a great deal in order to make sure the correct API method is being used. To be honest, switching to the PascalCase layout hasn't quite sunk in the muscle memory just yet, and that is frustrating from my point of view. Since C# and Java are considered to be brother languages, as both are descended from C++, why the variation in the language conventions? Was it a personal decision by the creators based on their comfort level, or was it just to play mindgames with new introductees to the language?

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• Why don't I have the option ''Install Ubuntu alongside with them''

  - by almqgh

  Why dont I have this option? here are my disk sudo fdisk -l Disk /dev/sda: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x5b53cc54 Device Boot Start End Blocks Id System /dev/sda1 * 2048 409599 203776 7 HPFS/NTFS/exFAT /dev/sda2 409600 1153767021 576678711 7 HPFS/NTFS/exFAT /dev/sda3 1216962560 1250050047 16543744 7 HPFS/NTFS/exFAT /dev/sda4 1250050048 1250261679 105816 c W95 FAT32 (LBA) Disk /dev/sdb: 4005 MB, 4005527552 bytes 32 heads, 63 sectors/track, 3880 cylinders, total 7823296 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x20d8782d Device Boot Start End Blocks Id System /dev/sdb1 * 63 7822079 3911008+ c W95 FAT32 (LBA)

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• why google ignore my links page?

  - by Yaniv

  I have a website, where im loading all the data via AJAX. since, google doesn't work with AJAX, and the ways to make it AJAX-friendly are a bit odd, i thought that by creating a links page, where it links, from server side, to all the links that im loading in ajax - will solve the problem. but unfortunately, that doesnt seem to work. google webmaster shows that even though my links page discovered, the content of it - the links - are totally ignored. I can only assume that google tend to ignore links in such pages. my question is - WHY?! and furthermore, how to overcome this. Thanks.

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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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• 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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• Why to let / not let developers test their own work

  - by pyvi

  I want to gather some arguments as to why letting a developer testing his/her own work as the last step before the product goes into production is a bad idea, because unfortunately, my place of work sometimes does this (the last time this came up, the argument boiled down to most people being too busy with other things and not having the time to get another person familiar with that part of the program - it's very specialised software). There are test plans in this case (though not always), but I am very much in favor of making a person who didn't make the changes that are tested actually doing the final testing. So I am asking if you could provide me with a good and solid list of arguments I can bring up the next time this is discussed. Or to provide counter-arguments, in case you think this is perfectly fine especially when there are formal test cases to test.

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• Why does Zend discourage "floating functions"?

  - by kojiro

  Zend's Coding Standard Naming Convention says Functions in the global scope (a.k.a "floating functions") are permitted but discouraged in most cases. Consider wrapping these functions in a static class. The common wisdom in Python says practically the opposite: Finally, use staticmethod sparingly! There are very few situations where static-methods are necessary in Python, and I've seen them used many times where a separate "top-level" function would have been clearer. (Not only does the above StackOverflow answer warn against overuse of static methods, but more than one Python linter will warn the same.) Is this something that can be generalized across programming languages, and if so, why does Python differ so from PHP? If it's not something that can be generalized, what is the basis for one approach or the other, and is there a way to immediately recognize in a language whether you should prefer bare functions or static methods?

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