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• Restrict Overriding memory_limit in php.ini

  - by Rohit Batra

  We have a issue that just came to our notice, some of our developers used ini_set('memory_limit', -1) to over-ride the php.ini memory_limit settings in their code files. Due to which sometimes our Memory/CPU usage is way far more than usual and we even have experienced server hanging/crashing many times. Is there any way to restrict these changes for certain params like memory_limit, upload_max_filesize & post_max_size? Users should not be able to edit them after a certain limit set? Sorry if i asked a dumb question, tried searching but there was no reference to this only found answers asking for increasing these parameters.

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• Large keepalive_requests values are severely slowing-down Nginx

  - by Gil

  When running a bacon (43-byte transparent pixel) load test on Nginx, we have tried several keepalive_requests values (from 10 to 100,000) and the optimal value seems to be 10. Here are the server HTTP headers of this tiny reply: HTTP/1.1 200 OK Server: nginx/1.5.6 Date: Wed, 23 Oct 2013 12:39:45 GMT Content-Type: image/gif Content-Length: 43 Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT Connection: keep-alive Nginx is twice slower with keepalive_requests 100000 than with keepalive_requests 10. Can you help understanding that result? Or tell what we do wrong? For reference, here is the nginx.conf file.

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• OS X Terminal using default ANSI colours for every theme

  - by FrogBot

  For some reason, every theme I palette I've had installed for the OS X Terminal.app has reverted to using the default ANSI colours. The themes have been working fine up until this point and I can't seem to determine what could have caused them to revert in this way. For reference, my standard Solarized Dark colour scheme should look like this … … but it currently looks like this: A quick look in the preferences panel shows that all the colours are correct save for the ANSI colours which have reverted to their defaults. I don't know what other information would be helpful but if you need any other info to help me troubleshoot just ask and I'll update as quickly as I can.

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• What to do if my computer is infected by a virus or a malware?

  - by Gnoupi

  This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive answer. I expect our best minds to participate, so we can have a comprehensive reference for this problem. What should I do if my Windows computer seems to be infected with a virus or malware? What are the symptoms of an infection? What should I do after noticing an infection? How can I get rid of it? As this is community wiki, feel free to edit this question to improve it as well.

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• What do you do when you need whole-words search in Firefox?

  - by romkyns

  Example: I am looking to see if "arg" is a special keyword in Lua. I go to the Lua reference manual at http://www.lua.org/manual/5.1/manual.html. I search for "arg". I find hundreds of occurrences of the word "argument(s)" or "vararg". Any ideas? I know Firefox won't implement whole words as a core feature (something about cluttering up the ui... argh...), and I couldn't find a good addon that implemented this well.

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• Point subdirectory to another domain is IIS 6

  - by Liviu

  Is it possible to rewrite somehow www.mysite.com/Pictures to point to test.mysite.com/Pictures or even more broadly www.someothersite.com/Pictures ? Note: www.mysite.com and test.mysite.com are on separate machines and built with different technologies (one is ASP.NET and the other is PHP) but I have access to both of them. I want that when I reference a picture like www.mysite.com/Pictures/pic12345.png the picture to display correctly, even though there is not /Pictures folder on that server and the pictures has to be retrieved by going to test.mysite.com/Picture/pic12345.png Ideally I want to do this in IIS6 to test it. However I am interested if it possible to do in any webserver (Apache, IIS7)

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• Apache Subversion and Sudo - Why can't I resolve this hostname?

  - by Hollowsteps

  Okay, I made a mistake and I'll be the first to admit I'm new at this setup. I built a bare bones kit, installed Ubuntu on it, and attempted to set up a source control server for a project some friend and I were going to work on. Unfortunately, I screwed up. I followed a dodgy tutorial from 2005 and when it didn't work, started mixing and matching trying to get to the source of my problem. So now I sit before you, a broken and miserable man. Desperate to escape this annoying echo of 'Unable to resolve host computer.repositoryname.com', I uninstalled apache and subversion. That did not fix it. Next I tried to edit my /etc/hosts, going so far as to remove the reference to '127.0.1.1 computername'. Still I'm plagued. I know I messed up, is there any way to track down this wayward bug?

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• Best way to find the computer a user last logged on from?

  - by Garrett

  I am hoping that somewhere in Active Directory the "last logged on from [computer]" is written/stored, or there is a log I can parse out? The purpose of wanting to know the last PC logged on from is for offering remote support over the network - our users move around pretty infrequently, but I'd like to know that whatever I'm consulting was updating that morning (when they logged in, presumably) at minimum. I'm also considering login scripts that write the user and computer names to a known location I can reference, but some of our users don't like to logout for 15 days at a time. If there is an elegant solution that uses login scripts, definitely mention it - but if it happens to work for merely unlocking the station, that would be even better!

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• Alt-tab icon list in Gnome and metacity?

  - by Vinh Nguyen

  Can anyone provide a reference or explain how the icons to the alt-tab list is populated? I would like to specify some icons for some programs that do not have icons, e.g. xterm. I'm using Ubuntu 11.04 with Gnome 2 (Ubuntu Classic) and metacity as the window manager. I did see this thread that mentions /usr/share/pixmap/, but if I use cp gnome-terminal.xpm xterm.xpm the icon was not populated in the alt-tab icon list (even after a logout/login). I do see that the icon is populated when I added the xterm command to the Program Menu.

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• How to fore Word to recompute image numbers?

  - by Vojtech Ruzicka

  I have a word document containing images and tables. These have captions which are numbered, like "Image 1-Example of something". Later on I decided to rearrange some of chapters of my document. However numbering of objects remained the same, so the first image is image 8, the second is image 3, etc. I want to force Word to recompute image numbering so first image in document would be image 1, the second - image 2, etc. Is that possible? Will references (added through cross reference feature) to those objects be updated?

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• What is the meaining of "deassert" in this context?

  - by Sam.Rueby

  The English majors over at Dell provided me with this error message provided by a PowerEdge 2950. CPU2 Status: Processor sensors for CPU2, IERR was deasserted I've Googled it, random forum posts aren't providing me with a clear answer. It's also apparently not a word: http://dictionary.reference.com/browse/deassert?s=t I can guess the meaning. Assert: to state with assurance, confidence, or force Okay. So the negative of that. The state of lack-of-confidence? What is this error message trying to tell me? Memory errors were grouped with this one: is it trying to say that IERR for CPU2 should be set, but is not? That the current system state is SNAFU but CPU2 sees everything as fine?

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• Upgrading from php 5.3 to php 5.4 with Macport

  - by dr.stonyhills

  PHP5.4 has been available for sometime now and Macport recently caught up with the release of port php54 but the process of upgrading is not as clear as possible. Even worst for those who are new to maintaining multiple versions of PHP on the same machine. I am keen on trying out some of the new features in PHP5.4 like traits, new array form etc but falling back on to php5.3 for other compatibility stuff. So i sudo port install php5+ (all the variants, apache2 etc) Then i tell it what PHP port to use as default sudo port select --set php php54 Check what version of PHP is active in the terminal using php -v outputs php 5.4.3. But i seem to be having issues with choosing the right non cli version as in the version of the module run by apache etc is still php5.3.12. Do i have to change the reference to the libphp5 in apache httpd.conf? Any advice on the right workflow for switching between php version on macport greatly appreciated!

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• Advanced (?) Excel sorting

  - by Preston Grayskull

  First of all, I'd like to admit that I don't really know anything about Excel, but I have tried to look up a solution to this in Excel books and Googling. Here's what I'm trying to do: I have a really long spreadsheet There are 7 columns total, but only two columns that I'm most interested in. Here's an example CSV that is much more simple than my actual dataset, but the search/sort is analogous: John, Apple Dave, Apple Dave, Orange Steve, Apple Steve, Orange Steve, Kiwi Bob, Apple Bob, Banana I'm interested in extracting the entire rows (all of the columns) that meet the following criteria: ["Apple"] OR ["Apple" and "Orange"] NOT ["Apple" and "Orange" and Anything Else] NOT ["Apple" and Anything that isn't Orange] So with the above CSV, I would get the entire rows for John and Dave, but not Steve and not Bob. I started doing this manually, and will likely finish by the time this question has an answer, but I would like to know this for future reference. Thanks!

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• fsck: FILE SYSTEM WAS MODIFIED after each check with -c, why?

  - by Chris

  I use a script to partition and format CF cards (connected with a USB card writer) in an automated way. After the main process I check the card again with fsck. To check bad blocks I also tried the '-c' switch, but I always get a return value != 0 and the message "FILE SYSTEM WAS MODIFIED" (see below). I get the same result when checking the very same drive several times... Does anyone know why a) the file system is modified at all and b) why this seems to happen every time I check and not only in case of an error (like bad blocks)? Here's the output: linux-box# fsck.ext3 -c /dev/sdx1 e2fsck 1.40.2 (12-Jul-2007) Checking for bad blocks (read-only test): done Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information Volume (/dev/sdx1): ***** FILE SYSTEM WAS MODIFIED ***** Volume (/dev/sdx1): 5132/245760 files (1.2% non-contiguous), 178910/1959896 blocks

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• Use DOS batch to move all files up 1 directory

  - by Harminoff

  I have created a batch file to be executed through the right-click menu in Win7. When I right-click on a folder, I would like the batch file to move all files (excluding folders) up 1 directory. I have this so far: PUSHHD %1 MOVE "%1\*.*" ..\ This seems to work as long as the folder I'm moving files from doesn't have any spaces. When the folder does have spaces, I get an error message: "The syntax of the command is incorrect." So my batch works on a folder titled PULLTEST but not on a folder titled PULL TEST. Again, I don't need it to move folders, just files. And I would like it to work in any directory on any drive. There will be no specific directories that I will be working in. It will be random. Below is the registry file I made if needed for reference. Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\Directory\shell\PullFiles] @="PullFilesUP" [HKEY_CLASSES_ROOT\Directory\shell\PullFiles\command] @="\"C:\\Program Files\\MyBatchs\\PullFiles.bat\" \"%1\""

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• How do I force a specific MTU for only certain TCP ports?

  - by Dave S.

  Background I have a set of embedded hardware deployed in the field. These remote machines connect back to my servers at AWS running Ubuntu and I use the iptables mangle chain to lower the MTU to 500 so these devices are happy. For reference, this is the iptables rule I am using: -A POSTROUTING -p tcp --sport 12345 --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --set-mss 500 Current Problem I'm trying to spin up some servers on the Joyent Cloud using SmartOS, but I can't find any information on selectively changing the MTU like I can on Linux (e.g. all info I've found is on changing it globally, which is not what I want). How would I do it so that all connections on TCP port 12345 get the MTU I want?

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• How to enable Sqlite on a Mac OS X Mavericks [migrated]

  - by sehummel

  I upgraded my Mac with OS X Mavericks last week. It appears to have taken away support for Sqlite -- not Sqlite3, but sqlite. I need that for a website I work on. I went to Sqlite's website, but all I could find was older versions of Sqlite3. Where can I find a version of Sqlite? I've been through the php.ini and can only find one reference to sqlite. In short, how do I get Sqlite support on my Mac? I have Sqlite3 enabled and the issue isn't going away. I uncommented pdo_sqlite in the php.ini and I still have the issue.

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• How to charge an iPhone on a Windows PC without Installaing iTunes

  - by Martin Hollingsworth

  I want to be able to charge my iPhone on my work computer, which is running Windows Server 2008 SP1 64-Bit. When I plug the iPhone in with the USB cable, it will not charge. Windows attempts to locate a driver for the device but only comes up with a generic Camera device and even if I allow that to be installed, the iPhone still does not charge. I have checked the computer's BIOS settings and did not find anything relating to power on the USB devices. I also tried this on ports at the back of the computer in addition to those on the front. The PC is a Dell Optiplex 780. As far as I can tell USB devices do not charge unless Windows has installed an appropriate driver. Since it is a work computer I do not want to install iTunes which does include a driver. I have a workaround that I will post as an answer for reference.

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• DNS Zone file and virtual host question

  - by Jake

  Hi all, I'm trying to set up a virtual host for redmine.SITENAME.com. I've edited the httpd.conf file and now I'm trying to edit my DNS settings. However, I'm not sure exactly what to do. Here's an snippet of what's already in the named.conf file (the file was made by someone else who is unreachable): zone "SITENAME.com" { type master; file "SITENAME.com"; allow-transfer { ip.address.here.00; common-allow-transfer; }; }; I figure if I want to get redmine.SITENAME.com working, I need to copy that entry and just replace SITENAME.com with redmine.SITENAME.com but will that work? I was under the impression I needed a .db file but I don't see any reference to one in the current named.conf file. Any advice would be great and if you need more info to answer the question, don't hesitate to ask.

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• Outlook Registry Key Damaged; Tried "Fix It" and lost everything

  - by Ray

  My outlook 2007 (on Windows 7 64 bit) worked fine for two weeks. I then installed a printer/scanner/copier and the Outlook Window wouldn't open. I went to Microsoft's website and found a page that said my registry key was damaged. The page had a link to a Fix It program. I ran the program and it looks like all my Outlook data was wiped out. Can I get the data back? For future reference, how should I protect myself if the key goes bad again? Do you think I should unistall Outlook and re-install?

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• Error mounting samba share, cannot mount block device xxxx read-only

  - by Jeff Ward

  After installing Ubuntu 12.04, I'm trying to mount a samba share from Windows under Linux, using a scripted command that's always worked, and the server hasn't changed. The error is as follows: $ mount -t cifs //<host>/<share> /media/<share> -o username=<user>,password=<pass> mount: block device //<host>/<share> is write-protected, mounting read-only mount: cannot mount block device //<host>/<share> read-only $ I've read a lot of discussions about permissions, but unfortunately, that wasn't the issue. I'm submitting my own answer below for reference, hope this helps someone else.

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• How to make PDF pages with U3D images print properly?

  - by David Thornley

  I'm creating some PDF files that have three-dimensional images (U3D) in them. When I bring them up in Acrobat, everything is fine until I try to print the file. If I've viewed a page, it prints fine, showing the U3D image as I last saw it. If I haven't viewed a page yet, the printout is blank. (I can demonstrate this right from the Print dialog, by previewing pages.) The only reference I've seen to printing U3D is in the PDF Standard, which says, basically, that this should work. It recommends "PV" or "PO" for the A key in the 3D activation dictionary, and I'm using libharu which uses "PV".

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• Why do we still have to use drive letters to identify file systems?

  - by Charles E. Grant

  A friend has run into a problem where they installed Windows 7 from an external drive, and the internal boot drive is now assigned to H:. Theoretically this shouldn't cause problems because there are programming interfaces for getting the drive letter for the system drive. In practice though, there are quite a few programs that assume that C: is the only possible location for the system directories, and they refuse to run with the system directories on H:. That's not Microsoft's fault, but it's a pain none-the-less. The general consensus seems to be that a re-install, setting the internal boot drive to C:, is the only way to avoid fix these problems. UNIX-like systems display all file systems in a single unified directory tree and mostly seem to avoid problems like this. Is it possible to configure a Windows system without reference to drive letters, or does the importance of backwards compatibility mean that Windows will be working with drive letters from now until doomsday?

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• Best practice, or generally best way to set up web-hosting server, permissions, etc.

  - by Jagot

  Hi, I'm about to set up a server upon which a friend and I will be hosting web sites, and I'll be using Debian. I've set up a LAMP solution many times just to using for local testing purposes, but never for actual production use. I was wondering what are the best practices are in terms of setting the server up, in reference specifically to accessing the web root directory. A couple of the options I have seen: Set up a single user account on the server for us both to use and use a virtual host to point to the somewhere in the home directory, e.g. /home/webdev/www. Set each of us up a user account, and grant permissions in some way to /var/www (What would be the best way? Set up a new group?) I want to get this right when I first set this up as there won't be any going back for a while once our first site is up and running. Appreciate any guidance in advance.

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• What does dd conv=sync,noerror do?

  - by dding

  So what is the case when adding conv=sync,noerror makes a difference when backing up an entire hard disk onto an image file? Is conv=sync,noerror a requirement when doing forensic stuff? If so, why is it the case with reference to linux fedora? Edit: OK, so if I do dd without conv=sync,noerror, and dd encounters read error when reading the block (let's size 100M), does dd just skip 100M block and reads the next block without writing something (dd conv=sync,noerror writes zeros to 100M of output - so what about this case?)? And if is hash of original hard disk and output file different if done without conv=sync,noerror? Or is this only when read error occurred?

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