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• Keeping Private SSH Keys Safe

  - by Carmen

  I have a central server where I stored all the private ssh keys to the different machines that I want to ssh to. Currently, only sysadmins have access to this 'central' server. Given the above scenario, I like to ask the following questions: How do you protect your private ssh keys? I read about ssh-agent but I am not sure how to use it or if it can be used in this situation. If a sysadmin leaves and he copies all the private ssh keys, then he has access to all the servers. How do you deal with this situation?

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• Recursive Batch File

  - by MCZ

  I have a file that looks this: head1,head2,head3,head4,head5,head6 a11,a12,keyA,a14,a15,a16 a21,a22,keyB,a24,a25 a31,a32,keyC,a34 a41,a42,keyB,a44,a44 a51,a52,keyA,a54,a55,a56 a61,a62,keyA,a64,a65,a66 a71,a72,keyC,a74 some message Objective: Write list of unique keys to a text file. For example, the result for the file described above should be: keyA, keyB, keyC Here's the pseudocode I would like to implement in batch file recur.bat Read second line of inputfile If no key exist on second line, return else continue Append keyX to list FINDSTR /v keyX inputfile Pipe results to recur.bat I don't know if this is the most efficient way to do this without using actual programming language. Any suggestions for actual batch file code?

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• Set a custom favicon locally, that carries across the entire site.

  - by Iszi

  Is there a way to add a custom favicon to an App Tab? In the above thread, @admintech links to a great plugin for changing favicons which covers both the bookmarks folder and the address bar/tab bar icons. However, it still does not quite fully address what I was hoping to accomplish. I'd like to set an App Tab that has a customized icon, that stays the same in that tab no matter what I do there. Since the navigation within an App Tab is very restricted, the chosen favicon should always be relevant to whatever page is loaded in that tab. The Bookmark Favicon Changer has been effective in allowing me to use a custom favicon in the App Tab. But, the favicon only applies to the specific URL that was bookmarked. Any navigation done from that page will return the favicon to blank. Is there another plugin, or perhaps some special tweak to this plugin or the bookmark itself, that will allow me to make the favicon more persistent across the site?

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• good literature for teaching object oriented thinking in C [closed]

  - by Dipan Mehta

  Quite often C is the primary platform for the development. And when things are large scale, I have seen partitioning of the system as different objects is quite a natural thing. Some or many of the object orientated analysis and design principles are used here very well. This is not a debate question about whether or not C is a good candidate for object oriented programming or not. This is also NOT a question how to do OO in C. You can refer to this question and there are probably many such citations. As far as I am concerned, I have learned some of this things while working with many open source and commercial projects. (libjpeg, ffmpeg, Gstreamer which is based on GObject). I can probably extend a few references that explains some of these concepts such as - 1. Event Helix article, 2. Linux Mag article 3. one of my answers which links Schreiner's reference. Unfortunately, when we induct younger folks, it seems too hard to make them learn all of it the hard way. Usually, when we say it's C, a general reaction is to throw away all of the "Object thinking". Looking for help extending above references from those who have been in the similar areas of work. Are there any good formal literature that explains how Object thinking can be made to use while you are working in C? I have seen tons of book on general "object oriented paradigms" but they all focus on advanced languages mostly not in C. You see most C books - but most focus only on the syntax and the obfuscated corners of C and that's it. There are hardly ANY good reference, specially books or any systematic (I mean formal) literature on how to apply OO in C. This is very surprising given that so many large scale open source projects use C which are truly using this very well; but we hardly see any good formal literature on this subject.

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• Does lighter wallpaper consumes lesser power than a Darker one

  - by Lamb

  My VAIO advised me to switch to a White Background, to reduce power consumption. But it seems contradictory to common logic. Its like saying a brighter Torch consuming less than a dimmer one. Common Logic says that, Screen is BLACK when not using any POWER, so displaying black color should not consume any power (because without powering any pixel it gives black color) Also a white screen gives me more light than a darker one, so it should use more Energy. White Wallpaper = More Light Output = More Electrical Energy Consumed Black Wallpaper = Less Light = Less Electricity Consumed My question is - Is there anything wrong with the above argument ? A Lighter Wallpaper consumes less power than a Darker one. Is it true ? If yes, Why ?

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• SEO for maps-based websites that require user interaction

  - by j0nes

  I have a website that basically shows a lot of locations worldwide on a Google Maps like interface. The map itself is built using the Leaflet library and Open Street Map tiles. In the map, I show markers at each location I have. There is a popup window when I click on a marker that shows additional information and contains links to "detail" pages for this location. I fetch the location data for the viewpoint from an AJAX call from my server, so the additional information is not available in the HTML page itself. The detail pages are the pages my users are interested in. My normal users load the map, search the location they are interested in, click on a marker and click on a link in the popup window. However for search engines, this might look different. As this navigation pattern relies on user interaction, I think they might not be able to find the details page. My questions: Are search engines able to follow a navigation path like outlined above? How can I improve the navigation for search engines? (For example showing textual links below the map, sitemaps...) How important are internal links for SEO?

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• Optimized algorithm for line-sphere intersection in GLSL

  - by fernacolo

  Well, hello then! I need to find intersection between line and sphere in GLSL. Right now my solution is based on Paul Bourke's page and was ported to GLSL this way: // The line passes through p1 and p2: vec3 p1 = (...); vec3 p2 = (...); // Sphere center is p3, radius is r: vec3 p3 = (...); float r = ...; float x1 = p1.x; float y1 = p1.y; float z1 = p1.z; float x2 = p2.x; float y2 = p2.y; float z2 = p2.z; float x3 = p3.x; float y3 = p3.y; float z3 = p3.z; float dx = x2 - x1; float dy = y2 - y1; float dz = z2 - z1; float a = dx*dx + dy*dy + dz*dz; float b = 2.0 * (dx * (x1 - x3) + dy * (y1 - y3) + dz * (z1 - z3)); float c = x3*x3 + y3*y3 + z3*z3 + x1*x1 + y1*y1 + z1*z1 - 2.0 * (x3*x1 + y3*y1 + z3*z1) - r*r; float test = b*b - 4.0*a*c; if (test >= 0.0) { // Hit (according to Treebeard, "a fine hit"). float u = (-b - sqrt(test)) / (2.0 * a); vec3 hitp = p1 + u * (p2 - p1); // Now use hitp. } It works perfectly! But it seems slow... I'm new at GLSL. You can answer this questions in two ways: Tell me there is no solution, showing some proof or strong evidence. Tell me about GLSL features (vector APIs, primitive operations) that makes the above algorithm faster, showing some example. Thanks a lot!

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• Dealing with curly brace soup

  - by Cyborgx37

  I've programmed in both C# and VB.NET for years, but primarily in VB. I'm making a career shift toward C# and, overall, I like C# better. One issue I'm having, though, is curly brace soup. In VB, each structure keyword has a matching close keyword, for example: Namespace ... Class ... Function ... For ... Using ... If ... ... End If If ... ... End If End Using Next End Function End Class End Namespace The same code written in C# ends up very hard to read: namespace ... { class ... { function ... { for ... { using ... { if ... { ... } if ... { ... } } } // wait... what level is this? } } } Being so used to VB, I'm wondering if there's a technique employed by c-style programmers to improve readability and to ensure that your code ends up in the correct "block". The above example is relatively easy to read, but sometimes at the end of a piece of code I'll have 8 or more levels of curly braces, requiring me to scroll up several pages to figure out which brace ends the block I'm interested in.

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• PHP/mail : server sends email originating from wrong domain

  - by Niro

  I have a Mediatemple dv (Plesk) server with two domains, each has static IP. I had domain1 as main domain and domain2 as secondary. When A PHP script from domain2 sends email the headers show the IP address of domain1 as the origin. Received: from domain2.com (domain1.com [70.ipof domain1]). I want only domain2 to be mentioned so I did the following: Changed server name to domain2.com made domain2.com the primary domain (about 30 hours ago) made fixed IP address of domain2.com the default address for the server. Still when the script sends emails I see the same info as above in the header. What do I need to do to make the email origin domain2.com?

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• Difference between tc qdisc and netdev_max_backlog

  - by Mediocre Gopher

  I'm wondering what the difference between these two things on linux is. According to the docs tc qdisc can be used to set the queue size for egress and ingress packets coming in and out of the NIC (or that's how I understood it). But from what I understand netdev_max_backlog can also be used to set this. If I were to set both of them which would be used? Or are there actually two queues that are being manipulated in this case? If there are two queues, which queue is above the other (if the application is at the top and the hardware at the bottom)?

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• ubuntu 12.04 desktop Error: unknown command 'gfxmode'. Pressing any key continues

  - by Andy

  Premise: linux noobie here, I have the same issue as OP: fresh 12.04 desktop, changed grub with grub customizer, now I get a: unknown command 'gfxmode' press ...etc was asked to "re-post" this question and link to this thread which I refer to above. I have tried what Tarek said, and nothing seems to work, I find two lines with gfxmode: function gfxmode { gfxmode \$linux_gfx_mode Note: not sure if it matter but in the error the two single quotes before gfxmode are not the same, the first is a slanted quote mark, the second (after gfxmode) is a straight one. I commented out the whole line, I tried to add 'set' before gfxmode, neither did any difference. I found another place that said to remove the line from another file 40_custom, but I checked and those files do not contain anything relating to the line we are looking for: gfxmode $linux_gfx_mode Not sure what I am missing, but the file linux.save has recently appeared when searching for the line. Not sure if its just a temp file of some kind. In any case I cannot seem to get it, what am I missing? Thanks! P.S. sorry for any messups in form :)

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• CLI-Based monitoring tool for KVM

  - by Pinnacle

  I am developing a scheduler for running VMs on KVM. The scheduling has over-commitment of resources like memory and CPU. For this, I need a CLI-based monitoring tool that keeps me giving information about the resource usage of each VM, because it might be the case that due to over-provisioning of resources, VMs on a particular host are running very slowly depending on the benchmarks/programs each VM is running, and then I need to migrate a VM to another host and so on. I looked into libvirt-based tools like collects, MUNIN, Nagios-vert, etc.( http://libvirt.org/apps.html#monitoring ) I also looked into Ubuntu utility perf-kvm ( http://manpages.ubuntu.com/manpages/maverick/man1/perf-kvm.1.html ) I want to ask which CLI-based would be recommended by the community so that I can make a automated scheduler that takes care of the above situation.

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• Windows cmd does not recognize xx.exe even though xx.exe is in system path

  - by July

  I installed 7-zip and add its directory to system path: C:\Program Files\7-Zip to PATH, from windows start-input cmd and press enter, Windows command line is started, i type 7z.exe, then press enter, it just run. However when i start command line this way: cmd.exe /c start {projectDir} /D{driveLetter} cmd /K then i type 7z.exe, it gives me error because it can not find 7z.exe. why and how to fix? P.S. 1. I'm on Win7. 2. For some other apps, the above way did works, that's why i'm so confused how bat works.

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• Why, when on Kubuntu I lose internet connection, am I unable to reconnect?

  - by Jonathan

  Using Kubuntu 11.10. Sony Vaio computer. Network controller: Intel Corporation WiFi Link 5100. If I connect to a wireless network, and the signal drops, then I am unable to connect to any network without a reboot. I can assure that the issue has nothing to do with the computer going to sleep, as I have experienced the above while using my computer continuously. Here is exactly what happens: Connect to network (at University, where the connection is not so great). The connection is broken There are three other possible networks available, but none of them can be connected to. I have tried off and on sometimes for hours. I am always able to reestablish a connection after a reboot. I can only think of two explanations. The first is that a temp file is corrupted when the internet connection is abruptly dropped. The second is that my computer actually corrupts something before the loss of internet connection, which causes the loss in signal, and inability to reconnect. However, I am not confident that my explanations are complete, nor do I have any idea how to test these things.

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• Belkin Wireless G router not working on Windows 7

  - by coore

  I have a Belkin F5D7230-4 Wireless G router which used to work on XP. I have a clean Windows 7 install (on the same desktop PC), and it just won't work. Device Manager lists the adapter as a USB device, but it says "The drivers for this device are not installed", even though the driver installer said the installation was OK. Manage Wiresless Networks says "wireless is not currently enabled". The WLAN AutoConfig service is running. My specific question is which of the two symptoms above should I go for first? Should I try to fix the driver installation somehow, or should I try to enable wireless? Is one caused by the other, or is this two independent problems? Any other thoughs that could help me are also appreciated.

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• RJ45 female to male fault

  - by GeoPhoenix

  i have the following - common - problem, on one end of the cable, there are RJ45 males T586 A which are connected to a 8-port switcher, on the other end, there supposed to be RJ45 females _T586 A which in turn will allow another RJ45 male to be connected. the commonly used color scheme was followed on males (having the head down) blue white blue orange white green green white orange brown white brown the problem i believe is located on female end of cable, which i try multiple time to follow the numbers designated by the module, which is the list above in reverse, and as listed resulting in no signal transmission. tried the T586B (both ends) for device to device once, but no results. Which is the proper way of handling this wiring? There were also additional RJ45 females with the numbers 6-5-4-3, but 1 to 8 isn't supposed to be used for this?

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• Various problems with software raid1 array built with Samsung 840 Pro SSDs

  - by Andy B

  I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: Serious write speed problems: root [~]# time dd if=arch.tar.gz of=test4 bs=2M oflag=sync 146+1 records in 146+1 records out 307191761 bytes (307 MB) copied, 23.6788 s, 13.0 MB/s real 0m23.680s user 0m0.000s sys 0m0.932s When doing the above (or any other larger copy) the load spikes to unbelievable values (even over 100) going up from ~ 1. When doing the above I've also noticed very weird iostat results: Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 1589.50 0.00 54.00 0.00 13148.00 243.48 0.60 11.17 0.46 2.50 sdb 0.00 1627.50 0.00 16.50 0.00 9524.00 577.21 144.25 1439.33 60.61 100.00 md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 0.00 1602.00 0.00 12816.00 8.00 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 And it keeps it this way until it actually writes the file to the device (out from swap/cache/memory). The problem is that the second SSD in the array has svctm and await roughly 100 times larger than the second. For some reason the wear is different between the 2 members of the array root [~]# smartctl --attributes /dev/sda | grep -i wear 177 Wear_Leveling_Count 0x0013 094% 094 000 Pre-fail Always - 180 root [~]# smartctl --attributes /dev/sdb | grep -i wear 177 Wear_Leveling_Count 0x0013 070% 070 000 Pre-fail Always - 1005 The first SSD has a wear of 6% while the second SSD has a wear of 30%!! It's like the second SSD in the array works at least 5 times as hard as the first one as proven by the first iteration of iostat (the averages since reboot): Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 10.44 51.06 790.39 125.41 8803.98 1633.11 11.40 0.33 0.37 0.06 5.64 sdb 9.53 58.35 322.37 118.11 4835.59 1633.11 14.69 0.33 0.76 0.29 12.97 md1 0.00 0.00 1.88 1.33 15.07 10.68 8.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 1109.02 173.12 10881.59 1620.39 9.75 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.41 0.01 3.10 0.02 7.42 0.00 0.00 0.00 0.00 What I've tried: I've updated the firmware to DXM05B0Q (following reports of dramatic improvements for 840Ps after this update). I have looked for "hard resetting link" in dmesg to check for cable/backplane issues but nothing. I have checked the alignment and I believe they are aligned correctly (1MB boundary, listing below) I have checked /proc/mdstat and the array is Optimal (second listing below). root [~]# fdisk -ul /dev/sda Disk /dev/sda: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 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: 0x00026d59 Device Boot Start End Blocks Id System /dev/sda1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sda2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sda3 4605952 814106623 404750336 fd Linux raid autodetect root [~]# fdisk -ul /dev/sdb Disk /dev/sdb: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 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: 0x0003dede Device Boot Start End Blocks Id System /dev/sdb1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sdb2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sdb3 4605952 814106623 404750336 fd Linux raid autodetect /proc/mdstat root # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb2[1] sda2[0] 204736 blocks super 1.0 [2/2] [UU] md2 : active raid1 sdb3[1] sda3[0] 404750144 blocks super 1.0 [2/2] [UU] md1 : active raid1 sdb1[1] sda1[0] 2096064 blocks super 1.1 [2/2] [UU] unused devices: Running a read test with hdparm root [~]# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 664 MB in 3.00 seconds = 221.33 MB/sec root [~]# hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 288 MB in 3.01 seconds = 95.77 MB/sec But look what happens if I add --direct root [~]# hdparm --direct -t /dev/sda /dev/sda: Timing O_DIRECT disk reads: 788 MB in 3.01 seconds = 262.08 MB/sec root [~]# hdparm --direct -t /dev/sdb /dev/sdb: Timing O_DIRECT disk reads: 534 MB in 3.02 seconds = 176.90 MB/sec Both tests increase but /dev/sdb doubles while /dev/sda increases maybe 20%. I just don't know what to make of this. As suggested by Mr. Wagner I've done another read test with dd this time and it confirms the hdparm test: root [/home2]# dd if=/dev/sda of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 38.0855 s, 282 MB/s root [/home2]# dd if=/dev/sdb of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 115.24 s, 93.2 MB/s So sda is 3 times faster than sdb. Or maybe sdb is doing also something else besides what sda does. Is there some way to find out if sdb is doing more than what sda does? UPDATE Again, as suggested by Mr. Wagner, I have swapped the 2 SSDs. And as he thought it would happen, the problem moved from sdb to sda. So I guess I'll RMA one of the SSDs. I wonder if the cage might be problematic. What is wrong with this array? Please help!

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• How to adopt scrum agile methodology for a small .Net team

  - by Thabo

  I am working on a small product based company developing .Net applications. There is a small team with 5-6 developers. I am a person responsible for planning everything. But my primary role is Software developer. Now our current project is very unstable because of poor organization. Today my boss called me and told to submit a report about required resources, appropriate methodology, required man power and their salary scales to make the current project success. I know I don’t have enough organization skills and I need to go deep in my programming skills. So I need to focus only in the development. So I can’t manage the project anymore. Now I am searching some other ways to make ongoing development success. My questions are What is the suitable agile methodology to my team? Is Scrum is suitable for above mentioned scenario? If we adopt Scrum, what we have to do next? (I think hiring new one to manage the project is more suitable. So we have to get Scrum master and some other developers.) Are there any resources (books, Blogs and etc) to get some tips and advices to solve this problem? If Scrum is not a suitable methodology for our scenario, what else can be more suitable methodology to adopt? Can anyone give a good solution for my problem?

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• what are security implications of running Ubuntu inside Windows 7?

  - by EndangeringSpecies

  I am thinking of switching to Ubuntu as a way of making web browsing more secure. So, suppose I will go the easy route and run Ubuntu as an app inside Windows and then run Firefox inside of that. What will this do to the security given the current threat environment? E.g. do most online threats nowadays target the browser and flash (which presumably would be safely sandboxed inside easy to wipe Ubuntu environment) or do they target the Windows TCP-IP stack where Ubuntu would give no protection? Well, most likely the above question does not come near to covering all the security implications of this setup :-), so please do discuss whatever other issues that may be relevant here.

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• Why would Java app make RPC call to itself?

  - by amphibient

  I am working with a multithreaded homegrown multi-module app in my new job. We use the the Thrift protocol to communicate RPC calls between different stand-alone applications in a distributed system. One of them listens on multiple ports and I just noticed that it actually makes an RPC call to itself from one thread invoked from one socket it listens to (web service call) to another port within the same app. I verified that it could accomplish the same thing if it just went and directly called the method that the remote procedure ultimately invokes as it is all within the same application, same JVM. To make it even more mysterious, the call is completely synchronous, i.e. no callbacks involved. The first thread totally sits and waits until it makes a call across the wire to itself and comes back. Now, I am perplexed why anybody would do it this way. It seems like calling somebody on the phone that sits in the same room as you do. Can anybody provide an explanation why the developer before me would come up with the above mentioned model? Maybe there is a reason and I am missing something.

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• Where to look for challenging jobs with a relaxed atmosphere?

  - by RBTree

  I'm a dev at one of the big-name tech companies. I like the job for many reasons: I do interesting work on a cool product I solve challenging problems and use a lot of high-level skills (quantitative, creative, writing, presenting) It pays well The problem is that I feel I need a more relaxed atmosphere (shorter hours, less performance pressure, and more flexibility), in order to free up time for other pursuits and reduce stress. The ideal would be a job that's around 30-35 hours a week, where there is flexibility to work more or less in a given week. Can anyone suggest where to look for a job like this, where I wouldn't have to sacrifice too much on the above points? (Obviously I would have to sacrifice pay.) My employer does not generally offer part-time employment. The closest thing I can think of is when I did summer internships at my university's CS department. The work was very intellectually challenging, but if I needed to go home a couple hours early or get flexibility on a due date, nobody batted an eyelash. However, I'd like to find out if there are alternatives to academia since from what I've seen the pay there is a gigantic drop from what I'm currently making. I've done freelance development before, but I do like that as an employee of a large company I have a lot of things taken care of for me (e.g. benefits and guaranteed stable employment).

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• How can I improve my isometric tile-picking algorithm?

  - by Cypher

  I've spent the last few days researching isometric tile-picking algorithms (converting screen-coordinates to tile-coordinates), and have obviously found a lot of the math beyond my grasp. I have come fairly close and what I have is workable, but I would like to improve on this algorithm as it's a little off and seems to pick down and to the right of the mouse pointer. I've uploaded a video to help visualize the current implementation: http://youtu.be/EqwWcq1zuaM My isometric rendering algorithm is based on what is found at this stackoverflow question's answer, with the exception that my x and y axis' are inverted (x increased down-right, while y increased up-right). Here is where I am converting from screen to tiles: // these next few lines convert the mouse pointer position from screen // coordinates to tile-grid coordinates. cameraOffset captures the current // mouse location and takes into consideration the camera's position on screen. System.Drawing.Point cameraOffset = new System.Drawing.Point( 0, 0 ); cameraOffset.X = mouseLocation.X + (int)camera.Left; cameraOffset.Y = ( mouseLocation.Y + (int)camera.Top ); // the camera-aware mouse coordinates are then further converted in an attempt // to select only the "tile" portion of the grid tiles, instead of the entire // rectangle. this algorithm gets close, but could use improvement. mouseTileLocation.X = ( cameraOffset.X + 2 * cameraOffset.Y ) / Global.TileWidth; mouseTileLocation.Y = -( ( 2 * cameraOffset.Y - cameraOffset.X ) / Global.TileWidth ); Things to make note of: mouseLocation is a System.Drawing.Point that represents the screen coordinates of the mouse pointer. cameraOffset is the screen position of the mouse pointer that includes the position of the game camera. mouseTileLocation is a System.Drawing.Point that is supposed to represent the tile coordinates of the mouse pointer. If you check out the above link to youtube, you'll notice that the picking algorithm is off a bit. How can I improve on this?

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• Signal strength and Speed of wireless network

  - by Tim

  As shown by Lenovo Access Connections on my Windows 7, the wireless network I am using has a speed of 54.0Mbps but a signal strength of 88%. I am using WinSCP with unlimited speed to download files. WinSCP shows that the speed fluctuates between 100 and 120KiB/s. I was wondering what are the difference between the two speeds from Lenovo Access Connections and WinSCP? How can I tell the actual speed performance, for example, from the above measurements: speeds and the signal strength mentioned in the two places. Thanks and regards!

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• Bizarre SSH Problem - It won't even start

  - by thallium85

  I recently got Ubuntu 12.04 Precise, got it up and running with some MediaWiki software, static IP on the box and router and was able to access the main page even from a cell phone. Everything seemed great... Then I wanted to finally get rid of the monitor and keyboard and login remotely via SSH. I installed openssh-server, let everything point to port 22 for a test run and installed putty on my Windows XP machine. I got a connection refused. Went back and started checking the Ubuntu install itself... (I'm under root from this point on) $ sudo -s $ service ssh status ssh stop/waiting $ service ssh start ssh start/running, process 2212 $ service ssh status ssh stop/waiting Apparently ssh has stopped or is waiting for something.... $ ssh localhost ssh: connect to host localhost port 22: Connection refused I can't even connect to myself... I checked ufw (firewall) to see if port 22 is doing alright... $ sudo ufw status Status: active To Action From 22 ALLOW Anywhere 22/tcp ALLOW Anywhere 22 ALLOW Anywhere (v6) 22/tcp ALLOW Anywhere (v6) sshd_config shows only Port 22 Is ssh not using the right IP address at all? I just don't get what I did wrong here. When this is up and running I will def change the port number, but for now, I don't want to mess with the default install too much until a test run with putty is successful. Edit: Here are my sshd_config file and my ssh_config file. The command /usr/sbin/sshd -p 22 -D -d -e returns: /etc/ssh/sshd_config line 159: Subsystem 'sftp' already defined. Edit: @phoibus moving the sshd_config file and reinstalling did the trick! service ssh status the above command shows that ssh is now running and I am now able to log in from my windows xp computer remotely via putty. Thanks so much! I can now use my monitor for other things!

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• Mass editing videos on Ubuntu?

  - by rick

  Hi, I'm trying to add a watermark and a credits image to all of my old videos. I downloaded them off YouTube so they are all flv (H.264?). Is there some software that will allow me do simple edits in batches? I know a little bit of Python and tried looking at some of the library but they all seem like overkill (and way above my head). So is there a solution besides getting some software and going through all my videos and doing it manually? They are all mostly the same length, but it would be nice to specify a relative position for my credits. e.g. show a static image for 10 seconds when the video is at 95%

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