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• Is it possible to modify a color scheme and windows decorations in Xfce4?

  - by Juhele

  just testing PCLinuxOS Phoenix XFCE Edition 2011-07 which I would like to install on my grandpa's PC instead older PCLOS 2009 with KDE3 (which is almost impossible to upgrade). The PC is relatively older one (Sempron 2200+ CPU, MSI K7N2GM2 board with integrated GeForce 440MX series graphics, 1GB RAM and 80GB IDE HDD) and I thought that it is too weak for KDE4. I already used Xfce in the past (Sam Linux 2006 and 2007), but in new Xfce4 I am not able to somehow change the windows color scheme and the windows decorations - the settings manager offers me switching between preinstalled themes but it is possible to modify them with some GUI?

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• How to analyse logs after the site was hacked

  - by Vasiliy Toporov

  One of our web-projects was hacked. Malefactor changed some template files in project and 1 core file of the web-framework (it's one of the famous php-frameworks). We found all corrupted files by git and reverted them. So now I need to find the weak point. With high probability we can say, that it's not the ftp or ssh password abduction. The support specialist of hosting provider (after logs analysis) said that it was the security hole in our code. My questions: 1) What tools should I use, to review access and error logs of Apache? (Our server distro is Debian). 2) Can you write tips of suspicious lines detection in logs? Maybe tutorials or primers of some useful regexps or techniques? 3) How to separate "normal user behavior" from suspicious in logs. 4) Is there any way to preventing attacks in Apache? Thanks for your help.

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• Why doesn't it seem to be any development in the field of 3D VR gear, especially with regard to gaming?

  - by neuviemeporte

  I remember that way back around 1995, there was this big craze with VR in the media, a whole bunch of (mostly mediocre) games labeled as "virtual-reality-interactive-movie (...)" were published. If I recall correctly, the first 3D VR helmet was called VFX-1 and was sold bundled with Descent and some dedicated joystick. I never owned one, and I read just one review which was mostly enthusiastic, but pointed to some weak points, like the eyes getting tired after an hour or so of playing. Then the whole thing basically flickered down and died. I suppose the main reason it wasn't successful was that the hardware of the day was not powerful enough, the VR gear's design wasn't perfected to make it comfortable and natural to use, and the companies that made it failed to market it successfully. What I can't understand is why isn't there any development in the field today. There is some vr-ish hardware mostly targeted at the consoles (Kinect, Wii remote, TrackIR), but all projects of creating some 3d head-mounted display system seem to be in early infancy, appear once in a trade show somewhere and aren't heard of again. I think it could work great with head tracking and some of today's shooters, flight sims (trackIR is nice but the movement scale translation is awkward) and other games with an FPP POV. Is there any technological reason why decent vr headgear can't be made today, or is it just that nobody really cares/everyone is scared to repeat the '90s failure?

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• Shell script for replacing string in all PHP-files, for each user

  - by Mads Skjern

  Each user has some php-files using a shared database commondb. I want to iterate over all users (in users.csv), and in their home folder (e.g. /home/joe) find all php files recursively, and replace each occurrence of "commondb" with their own databasename, e.g. "joedb" for "joe". I have tried the following: #!/bin/bash # Execute like this: # bash localize.bash users.csv OLDIFS=$IFS IFS="," while read name dummy do echo $name find /home/${name} -name '*.php' -exec sed -i '' 's/commondb/${name}db/g' "{}" \; done < $1 IFS=$OLDIFS for users.csv joe, Joe J george, George G It does not fail, but the files are unchanged. I am quite weak in bash, and I can't figure out how to debug it :/ Can my script be fixed to work?

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• If you develop on multiple operating systems, is it better to have multiple computers + displays?

  - by dan

  I develop for iOS and Linux. My preferred OS is Ubuntu. Now my software shop (me and a partner) is developing for Windows too. Now the question is, is it more efficient to have multiple workstations, one for each target OS? Efficiency and productivity is a higher priority than saving money. I have a 3.4Ghz i7 desktop workstation running Ubuntu and virtualized Windows with two displays, and I'm putting together an even more powerful i7 Hackintosh with 16GB RAM (to replace my weak 2.2Ghz i5 Macbook Pro). My specific dilemma is whether I should sell the first computer and triple boot on the second one, or buy two more displays and run both desktop systems simultaneously. Would appreciate answers from developers who write software for multiple OSes. Running guest OSes in VirtualBox on one system not ideal, because in my experience performance is seriously degraded under virtualization. So the choice is between dual/triple booting on one system vs having two systems, one for OSX+iOS/Windows (dual boot) and the other for Ubuntu (which I prefer to use as my main OS). For much of our work, I write a server-side application in Linux and a client for iOS (or for Windows or OS X) simultaneously.

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• Using wifi router as bridge to increase signal?

  - by overtherainbow

  A friend of mine lives in an appartment building whose structure is such that wifi signal is very weak. Even a USB key won't work. I was thinking of buying an entry-level wifi router and reconfigure it as a bridge to act as repeater. Would that increase the chance of getting a good signal, or I shouldn't bother? If experience shows that it does improve things significantly, is their another router I should look at besides the Linux-based Linksys models? Thank you.

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• Good design for class with similar constructors

  - by RustyTheBoyRobot

  I was reading this question and thought that good points were made, but most of the solutions involved renaming one of the methods. I am refactoring some poorly written code and I've run into this situation: public class Entity { public Entity(String uniqueIdentifier, boolean isSerialNumber) { if (isSerialNumber) { this.serialNumber = uniqueIdentifier; //Lookup other data } else { this.primaryKey = uniqueIdentifier; // Lookup other data with different query } } } The obvious design flaw is that someone needed two different ways to create the object, but couldn't overload the constructor since both identifiers were of the same type (String). Thus they added a flag to differentiate. So, my question is this: when this situation arises, what are good designs for differentiating between these two ways of instantiating an object? My First Thoughts You could create two different static methods to create your object. The method names could be different. This is weak because static methods don't get inherited. You could create different objects to force the types to be different (i.e., make a PrimaryKey class and a SerialNumber class). I like this because it seems to be a better design, but it also is a pain to refactor if serialNumber is a String everywhere else.

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• slow virtualbox guest

  - by ecoologic

  I run a guest ubuntu 12.04 on a host ubuntu 12.04, with virtual box, and the guest is much, much slower than the host (ALT+TAB costs 4-5secs). I had a look around and I found contradicting opinions on virtualbox vs vmware (free), so I taught to keep the former. Both systems are updated, I installed the additions on the guest and I evenly split memory and video memory (64mb) between guest and host. I am running a toshiba m200 laptop with 4GB ram and shared video memory. The host bios does not include a configuration option for machine virtualization. I have 2 cpus and I can't give them both to the vm. Is there anything I overlooked that could solve my problem? Feel free to ask for more info, and thank you for any help. EDIT Idling with the monitor open the (single) guest cpu never gets below 55% and could raise to 80 - 90% just moving the mouse around, opening ff will cause the monitor to run 100% in the guest, while the host shows that both cpus are evenly working around 60%. My cpu is Intel® Core™2 Duo CPU T5450 @ 1.66GHz × 2. If this is not a configuration problem, does it mean my machine is too weak for virtualization?

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• sharing life experience

  - by gcc

  I am a student of computer engineering. I have never done any programming before, and as you can understand, I don't know how to study it or how to make my own programs. My English is weak [edited for clarity - ed], and so if you don't like the choices I list, please feel free to provide others. How should I study? How should I learn programming languages? Study completely from a book. Don't study from a book, just try writing code. A mix of the two; study from a book, then try writing code. Study half the book, then write the code by hand on paper. Listed to the teacher, then try to solve general problems (those not from any specific chapter). I have send that question to stackoverflow before when I am at first year. Now, I want to construct webpage to guide fresh students by giving advise of yours and mines.Maybe, you wonder Why I want to construct webpage , I just want help the other student. I am giving a link to that question < http://stackoverflow.com/questions/3389465/how-should-i-study-programming-languagess If you have other advice, feel free. EDIT: This web cite, I think , is constructed to share member's life experience and also I know these experiences is valuable . So I have no right to want your opinion, But I want your opinion / experience even if you think it is not so helpful to other

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• How to disable the text shadow in plasma widgets KDE 4.6?

  - by piedro

  I just switched completely to Kubuntu for the sake of the more suitable applications for my purposes and their overall integration in the system. But I'm not very happy with all those desktop effects and tranparent looks everywhere. Some things a matter of taste I guess. Some things just unbearable for me having weak eyes. One of them is that about every light theme seems to be using a text shadow effect on the plasma widgets. A white "spilled milk" effect underneath dark text on light grey or glassy background. Drives my eyes nuts! I can remove this effect on the desktop folder by unselecting "shadow" as text effect. I can't find any way to switch it of in the panel and the plasma widgets. My second, related question is, is there a plasma theme matching the oxygen look of the default desktop in light colors that uses the same colors as the ones chosen in the KDE color settings, - simple, opaque, no effects, gnome-like? Plz help someone! thx, piedro

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• How should I approach learning programming languages?

  - by gcc

  I am a student of computer engineering. I have never done any programming before, and as you can understand, I don't know how to study it or how to make my own programs. My English is weak [edited for clarity - ed], and so if you don't like the choices I list, please feel free to provide others. How should I study? How should I learn programming languages? Study completely from a book. Don't study from a book, just try writing code. A mix of the two; study from a book, then try writing code. Study half the book, then write the code by hand on paper. Listed to the teacher, then try to solve general problems (those not from any specific chapter). I have send that question to stackoverflow before when I am at first year. Now, I want to construct webpage to guide fresh students by giving advise of yours and mines.Maybe, you wonder Why I want to construct webpage , I just want help the other student. I am giving a link to that question < http://stackoverflow.com/questions/3389465/how-should-i-study-programming-languagess If you have other advice, feel free. EDIT: This web cite, I think , is constructed to share member's life experience and also I know these experiences is valuable . So I have no right to want your opinion, But I want your opinion / experience even if you think it is not so helpful to other

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• If I don't want subdomains to send out email, do I need SPF records for them?

  - by Phil

  I have a main domain with (now) valid SPF record, but we also programmatically create lots and lots of subdomains for clients via cpanel PHPXML API. These subdomains are not intended to send any mail. When we create them, they are getting an A record of my ip, and a TXT record of "v=spf1 +a +mx +ip4:[MY IP] ?all". Those are all the DNS records they have Recently we have had a lot of email spoofing and realized there was an invalid (duplicate SPF) for our main domain. We just fixed that, but are unsure if: 1) Can spammers still spoof email from subdomains without MX records, with above current listed SPF? 2) Is it better to have no SPF for subdomains than the one I have listed? 3) Is there a way to prevent subdomains from sending/spoofing email via my main domain's SPF? Here is the main domain SPF that our host suggested we switch to: "v=spf1 a mx ptr a:dedrelay.[webhost].com include:dedrelay.[webhost].com ~all"

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• Google Cloud DNS and DNSSEC?

  - by Joe Burnett

  Since Google Cloud DNS does not currently support the record types for DNSSEC, is there any way to begin implementation of DNSSEC using TXT records? If I were using Google Cloud DNS, which I am, and they currently only support record types which include SOA, A, AAAA, CNAME, MX, NS, SPF, SRV, PTR and TXT: am I able to do it while constricted to these record types? Or do I have to wait until support is hard-coded into the service? I am just wondering because I would really like to ensure absolute integrity for my company so that I only convey realness in it's purity. =D

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• Matlab: Why is '1' + 1 == 50? [migrated]

  - by phi

  Matlab has weak dynamic typing, which is what causes this weird behaviour. What I do not understand is what exactly happens, as this result really surprises me. Edit: To clarify, what I'm describing is clearly a result of Matlab storing chars in ASCII-format, which was also mentioned in the comments. I'm more interested in the way Matlab handles its variables, and specifically, how and when it assigns a type/tag to the values. Thanks. '1' is a 1-by-1 matrix of chars in matlab and '123' is a 1-by-3 matrix of chars. As expected, 1 returns a 1-by-1 double. Now if I enter '1' + 1 I get 50 as a 1-by-1 double, and if I enter '123' + 1 I get a 1-by-3 double [ 50 51 52 ] Furthermore, if I type 'a' + 1 the result is 98 in a 1-by-1 double. I assume this has to do with how Matlab stores char-variables in ascii form, but how exactly is it handling these? Are the data actually unityped and tagged, or how does it work? Thanks.

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• reaching 99.9999% uptime

  - by christopher-mccann

  I am currently developing a project which is mission-critical. The actual domain name is registered with 1 & 1 and I plan on purchasing DynDNS Custom DNS service (which has 5 different geographical locations for DNS) and then another secondary DNS service to make sure my DNS is as failover safe as possible. Does it matter that the registration is with 1 & 1 - are they a weak link in the chain? All I really use them for is to say that DynDNS is my primary DNS nameserver and then my secondary DNS is my other nameserver. I can transfer the registration to DynDNS - Im just not sure if it really matters or not. Thanks

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• Routing based on source address in Windows Server 2008 R2

  - by rocku

  I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving packets with the external IP address and respond to them appropriately. However our infrastructure requires that traffic which is being load-balanced should go through a different gateway then any other traffic originating from the server, ie. updates etc. So basicly I need to route packets based on source address (external IP) to another gateway. The built-in Windows 'route' command allows routing based on destination address only. I've tried setting a default gateway on the loopback interface and mangled with weak/strong host send/receive parameters on the interfaces, however this didn't work. Is there any way around this, possibly using third party tools?

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• Accessing C$ over LAN on Win2008R2 - cannot by hostname but can by IP and FQDN

  - by Idgoo

  Having an issue with one of our Win2k8 R2 file servers. Trying to access C$ or the Admin share is giving us an error (see error details that the bottom), however we are able to connect using the server's IP and FQDN. can access \\172.16.x.x\c$ with domain cred can access \\server.domain.local\c$ with domain creds cannot access \\servername\c$ with same domain creds Server pings fine with Hostname, IP, FQDN, the Primary DNS suffix is also correct. DNS, PTR and Wins records are all correct for the Server I have checked that I am not trying to connect with cached credentials in the Windows vault, the server is also appending primary and connection specific DNS suffixes to the hostname. Any ideas what might be causing this issue? Error Details: c$ is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions

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• Extremely poor WiFi reception on new desktop

  - by guy

  I just received a new desktop with a built-in WiFi card (Windows 7 Home Premium x64). However, I am only able to receive any WiFi signal when the computer is within 1-2 meters of a router. Even then, the signal is very weak (Windows 7 says it is "poor"). I have tried this with 2 different routers and see similar results. I have somewhere around a dozen other devices that can connect to both routers with greater signal strength (usually full strength) from much, much further away. When I tried calling support I was instructed to reinstall my drivers and attempt to change the WiFi channel of the router. Neither worked. I was then told that the problem was with my routers and that the computer was functioning normally and that it was certainly not a hardware problem. What would be the cause of this and is there anything I can do to fix it?

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• Configuring an Engenius 3500

  - by dsiddens

  The title speaks to only half of the issue: the other half are the settings in Ubuntu and the sequences therein. The computer in this issue does receive internet with the external antenna jack at the back being fed with a simple magnetic base antenna designed for putting on the roof of an automobile. However, that signal is weak and the Engenius with an external antenna (Rootenna ~15db gain) and ehternet wire will supply a stronger, faster signal. I've set the Engenius to the desired source and entered the correct WEP password. The lights on the Engenius indicate that it's connected to the access point. At the Ubuntu side of this I've worked to no avail changing settings with "Edit Connections" to the point I'm Ask(ing)Ubuntu for help. I have and have RTFM for Engenius 3500 There is an embarrassing side note to this issue: At one time I had the Engenius working! It seems that I can't recall the settings and sequences I used way back when. And I may as well confess to not knowing the Command Line. I'm a GUI guy. Thank you for your time, Doug

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• Files copying between servers by creation time

  - by driftux

  My bash scripting knowledge is very weak that's why I'm asking help here. What is the most effective bash script according to performance to find and copy files from one LINUX server to another using specifications described below. I need to get a bash script which finds only new files created in server A in directories with name "Z" between interval from 0 to 10 minutes ago. Then transfer them to server B. I think it can be done by formatting a query and executing it for each founded new file "scp /X/Y.../Z/file root@hostname:/X/Y.../Z/" If script finds no such remote path on server B it will continue copying second file which directory exists. File should be copied with permissions, group, owner and creation time. X/Y... are various directories path. I want setup a cron job to execute this script every 10 minutes. So the performance is very important in this case. Thank you.

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• What are the memory-management capabilities of MySQL + JDBC (in light of autonomic computing)?

  - by Adel

  I'm interested in implementing some kind of autonomic-computing functionality using MySQL. By autonomic-computing I mean roughly some failsafe abilities, whereby the application appears to be at least slightly "intelligent" For reference, the main parts of autonomic computing we'd like are the "self-configuring" and "self-healing" features (the other two - "self-optimizing" and "self-protecting", are too abstract/futuristic for us, at this time). Sofor example, if we have a sample Java application that utilizes a MySQL database, we might want to automatically restart the MySQL database if we take up too much memory. Or maybe we want to have the ability to dynamiccally adjust the database memory as needed. So for example, when we start the application the database begins with a 56 Megabyte buffer; but then as we insert so many rows we want to have it automatically jump up to 512 MB, then to 1024, until a max of 4096 MB. Does all of the above suggest that MySQL is too "weak" for the task? Do you suggest using Oracle database? My professor believes that by using Java we can basically make up for any memory-management deficiencies that MySQL has in relation to Oracle DB. I'm new to MySQL , but have experience with Oracle. If all of the above sounds wishy-washy, it is because I'm still fleshing it out. thanks

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• Error on /home prevents OS boot

  - by mdrg

  Ok, I'll try to explain it listing the events: motherboard battery is weak, loses config everytime I shut the PC down; system clock usually back to 1990-something; this time, it went up to 2148; ubuntu became somewhat unusable (firefox refusing certificates, dropbox blocked), so I restarted; manually set the clock to current date and restarted; during boot, ubuntu detects errors and start auto-fix, rebooting itself in the middle of it (like a hard reboot, no shutdown messages) next time, shows boot animation screen in text mode, with an error message after a while: "Errors were found while checking the disk drive or /home", with "attempt to fix, ignore, skip mounting or manual recovery" None of the options during the boot work, they just type the text to the screen, then I'm forced to physically restart. Now I'm using Mint LXDE live CD, and I can see all my partitions just fine, including /home (my home folder blocked due to encryption, the other user folder is accessible and everything in place). I'm not sure how to proceed now. I'd like to just fix ubuntu boot without reinstalling or anything like it (at least until 12.04). What should I do now? can I easily fix this somewhow? Thanks!

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• Sending a mail to gmail from my local mail server

  - by tambia

  I just configured a mail server and tried sending a mail to my gmail account with a local email I created with my mail servers dns. I didn't go well. I use redhat server and sendmail and the testing was done with evolution mail. I had the following error : "RCPT TO<[email protected]> failed: <[email protected]>... relaying temporarily denied. Cannot resolve PTR for my ip" How can I solve this?

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• What's the benefit to learn Java programming?

  - by user30139

  I'm from the PHP world. Recently I'm trying to learn about Java. Because simply I'm a bit interested in Android development. Learning about Java gives more control about my cellphone. Say I could fine tune some applications to fit my personal requirements or even make my own ones. Still Java is a new world to me. I guess I'm already too comfortable with weak typed languages such as PHP. Honestly I think application development of no matter which kind wouldn't make too much difference. Because just as web development mostly framework based, what the developer do is to fill the blanks meaning to follow the protocols the given by the framework. Most of the code is still about business logic, that's what application development all about, right? The big difference seems to lie on the programming languages. Comparing to PHP, Java holds a whole package of constraints and practices. At this point, what are the benefits to learn programming in it?

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• Laser range finder, what language to use? Beginner advice

  - by DrOnline

  I hope this is the right place. I am a programming beginner, and I want to make a laser range finder, and I need advice about how to proceed etc. In a few weeks I will get a lot of dirt cheap 3-5V lasers and some cheap usb webcams. I will point the laser and webcam in parallel, and somehow use trigonometry and programming to determined distance. I have seen online that others made done it this way, I have purposefully not looked at the details too much because I want to develop it on my own, and learn, but I know the general outline. I have a general idea of how to proceed. The program loads in a picture from the webcam, and I dunno how images work really, but I imagine there is a format that is basically an array of RGB values.. is this right? I will load in the red values, and find the most red one. I know the height difference between the laser and the cam. I know the center dot in the image, I know the redmost dot. I'm sure there's some way to figure out some range there. TO THE POINT: 1) Is my reasoning sound thus far, especially in terms of image analysis? I don't need complete solutions, just general points 2) What I need to figure out, is what platform to use. I have an arduino... apparently, I've read it's too weak to process images. Read that online. I know some C I know some Python I have Matlab. Which is the best option? I do not need high sampling rates, I have not decided on whether it should be automated or whether I should make a GUI with a button to press for samples. I will keep it simple and expand I think. I also do not need it to be super accurate, I'm just having fun here. Advice!

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