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• Tar dereference only 1 level

  - by Bart van Heukelom

  I use the following pseudo-script to create a TAR of my installed software mkdir tmp ln -s /path/to/app1/bin tmp/app1 ln -s /and/path/going/to/the-app-2 tmp/app2 tar -c --dereference -f apps.tar tmp I need the --dereference option here to follow the links I just made in tmp. The reason I make the links in the first place is to store the directories with a different name in the archive than they have on the filesystem. Until now it has worked fine. However, I now have the situation that /path/to/app1 also contains links, and those I don't want to follow. Is this possible with some changes to the tar command? Or do I need to completely switch around the way I build the archive?

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• lighttpd silently stops logging

  - by Max Cantor

  I'm on a Slicehost 256MB VPS with Ubuntu 9.04 (Jaunty). lighttpd is the only web server process running; it listens on port 80. My lighttpd.conf can be found here. I'm using Ubuntu's default logrotate setup for lighty. At seemingly random times, lighttpd will stop logging. It is not correlated with log rotation--that is, the errors do not occur when logrotate kicks in. What happens is, I will verify that the server is serving files by hitting a URL with my browser, and I will verify that it is not logging by checking access.log and seeing that the GET request I just made is not there. Using init.d to restart the process starts logging again, without truncating or rotating the log file. That is, new requests will be logged at the end of the existing access.log file. There are no cron jobs running on this box. Any ideas?

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• Share in inbox in Google Apps Standard

  - by Saif Bechan

  I have recently signed up for the Standard account of Google apps. In my company I have certain email addresses that are handled by multiple users. For example the support emails are handled by multiple users. Now I have just multiple users log into the same account, but this is not a good practice. It can get quite messy when some emails are handled by different users but on the same email address. Now I looked into the groups option. I have made a group for [email protected], and added all the users to the group. Now everybody gets a copy of the support message sent. But its got a bigger mess because the users don't know who handles which message. Is there some workaround to this so I can make good use of this all in this way.

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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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• how to rewrite or redirect old or missing or invalid url to 404 page

  - by kath

  I recently upgraded a site and almost all URLs have changed. I have redirected all of them (or so I hope) but it may be possible that some of them have slipped by me. Is there a way to somehow catch all invalid URLs and send the user to a certain page I am using PHP Thanks so much! error file is already in .htaccess but seems nothing going to change you can see the error file as below AddHandler application/x-httpd-php5s .php ErrorDocument 404 /content/404.php <IfModule mod_rewrite.c> RewriteEngine on RewriteBase / here are 2 different url one the first one is old one which i edited and the secound one is edited one #1 old one (which is no longer on the server) http://adsbuz.com/vehicles-cars/toyoya/2009-toyota-land-cruiser-gxr-4686.htm #2 the editet one which is on the server http://adsbuz.com/vehicles-cars-for-sale/toyoya/2009-toyota-land-cruiser-gxr-4686.htm i need only the secound one with the vehicles-cars-for-sale because the other directory is already modified and its not on the server but as you can see after the (adsbuz) site name vehicles-cars and vehicles-cars-for-sale both are opening for same location I hope I made myself clear

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• move existing Windows XP to a new harddrive

  - by MrKanister

  I've bought a SSD for my laptop and made a fresh install of Windows 7. On my old HDD I've got a Windows XP system, which I would like to move to the SSD. I've tried it this way: put the HDD to an USB case moved the Windows XP partition to a partition on my ssd usind DriveImage XML used EasyBCD 2.0 to create a new entry in the boot menue The problem: Windows XP is booting up, but before the login-screen comes up, it seems to freeze. No bluescreens, no errors - just nothing happens. I tried to start it in "protected mode", but the same results. I'm not sure if DriveImage XML didn't worked well or if there's another reason.

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• VPN service for 4in6

  - by Deshene

  I have a local network with internet access. But unfortunately IPv4 internet connection speed is limited to 1mbps, which is realy sad. Fortunately I have a native IPv6, and there is no connection speed limit over IPv6. So, in order to get a good internet connection I made a plan: connect to the VPN-service over IPv6, and pass all IPv4 traffic through IPv6 tunnel, or something like that, I think you get the idea. I suggested to use service like HideMyAss.com, but unfortunately they don't support IPv6. The question is: Is there any existing VPN service that will make my dreams come true, and is easy to use, which I could connect over PPTP or OpenVPN (I want to set up connection to VPN in my router settings).

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• Redirect rss feed users

  - by Jeremy Love

  I made a redirect but when I subscribe to it, it doesnt get the feed from my new url it gets the one from my old url heres what I have. <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] RewriteCond %(REQUEST_URI) ^/articles$ [NC] RewriteRule ^(.*)$ htp://newsite.mysite.com/articles [R=301,L] RewriteCond %(REQUEST_URI) /(.) RewriteRule ^(.*)$ htp://newsite.mysite.com [R=302] RewriteCond %{HTTP_HOST} ^www\.oldsite.mysite\.com$ RewriteRule ^(.*)$ http://newsite.mysite.com [R=301,L] Redirect 301 / http://newsite.mysite.com/ </IfModule> any help is greatly appreciated, also do to me having no points i had to rename 2 of the urls to htp instead of http

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• Back in Town and Ready for New Beginnings

  - by MOSSLover

  Originally posted on: http://geekswithblogs.net/MOSSLover/archive/2013/11/03/back-in-town-and-ready-for-new-beginnings.aspxI just took a super long trip that lasted from September 27th until today.  I flew into St. Louis and then rented a car and drove over 12,000 miles.  I just dropped the rental off last night.  I went to a ton of states, did a lot of really cool things, saw a lot of really cool people, and bought a ton of beer.  I made some decisions, but this post isn't really about my decisions.  It's more about the question that everyone has been asking, "Where am I going to work?".So here's the answer...BlueMetal Architects as a Senior SharePoint Engineer.  Here is their website: http://www.bluemetal.com/.  I basically start tomorrow.  I didn't want to post anything super early, because I didn't want to jinx things.  I am really excited.  Now that I'm back I'm hoping that things will start to turn around for me.  I look forward to the future.

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• Windows 7 XPS Document Writer has stopped working

  - by jamie

  I have successfully used the Windows 7 XPS Document writer for quite a while under windows 7 (64 bit). Now however when i try to print i get prompted twice for the output file name and then get different error messages depending upon the application being used. e.g. Notepad gives a 'The I/O operation has been aborted because of either a thread exit or an application request'. I have disabled and reenabled the XPS facilities of windows features and have similiarly removed and readded the printer. But the end result is the same. I've uninstalled all applications i have installed since the time when i know it worked but this also has not made any difference. Suggestions please!

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• how to architect this to make it unit testable

  - by SOfanatic

  I'm currently working on a project where I'm receiving an object via web service (WSDL). The overall process is the following: Receive object - add/delete/update parts (or all) of it - and return the object with the changes made. The thing is that sometimes these changes are complicated and there is some logic involved, other databases, other web services, etc. so to facilitate this I'm creating a custom object that mimics the original one but has some enhanced functionality to make some things easier. So I'm trying to have this process: Receive original object - convert/copy it to custom object - add/delete/update - convert/copy it back to original object - return original object. Example: public class Row { public List<Field> Fields { get; set; } public string RowId { get; set; } public Row() { this.Fields = new List<Field>(); } } public class Field { public string Number { get; set; } public string Value { get; set; } } So for example, one of the "actions" to perform on this would be to find all Fields in a Row that match a Value equal to something, and update them with some other value. I have a CustomRow class that represents the Row class, how can I make this class unit testable? Do I have to create an interface ICustomRow to mock it in the unit test? If one of the actions is to sum all of the Values in the Fields that have a Number equal to 10, like this function, how can design the custom class to facilitate unit tests. Sample function: public int Sum(FieldNumber number) { return row.Fields.Where(x => x.FieldNumber.Equals(number)).Sum(x => x.FieldValue); } Am I approaching this the wrong way?

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• What should you do when presented with a horrible design?

  - by plua

  Our firm makes websites. We also design websites. But sometimes our client brings his/her own design. This is often made by an in-house designer, or it is the same design they used for something else. However, sometimes these designs look awful. And I am talking really unprofessional, unbalanced, uncool. But the client really wants this design. I really do not like working with a design that is so awful. It takes away all pleasure in coding. You code. You check the demo. Works great. Looks awful. It's just not fun. And ultimately the client might be happy, but 1) I do not feel proud of the final product and 2) the community sees you 'develop' ugly websites, which is bad for your image. Anybody experiencing this kind of stuff? What do you recommend? I've been thinking: Blocking these clients. If somebody has an 'own' design, ask to see it first. Then somehow politely decline. Drawback: you lose a client. Create a new design. Have our in-house designers work one something really cool. Drawbacks: client would need to pay for this (without asking for it), or it will be declined and the company loses time = money. And it might come as an insult if you propose a new design out of the blue. THEIR designer won't like it for sure. Put a clear disclaimer at the bottom of the site: Website design by XXXXX, Website development by US. Helps for the community-impact (if people pay attention), but not for the uneasy feeling.

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• configure vpn so that it is not the preferred route

  - by pstanton

  Hi all, I recently re-installed XP on my PC. I had a vpn set up on the old system and remember being advised to change one setting so that it wasn't the preferred route for all network traffic. This was ideal as only connections to the target network would be made through the vpn and all normal traffic would go through the regular path unmolested. i remember thinking "why isn't this the default setting!?". now i've formatted my drive and lost the config for that vpn (besides host, username, passwd). does anyone know of the setting i'm referring to? thanks, paul.

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• Problem in multi booting Ubuntu 12.04 with existing Windows XP, 7 and 8 in 500GB HDD with 5 Partitions

  - by Dhruva

  Here's my case. I have 500GB HDD with 5 Partitions with XP, Windows7 and Windows8 RP in the first three. As per one of the instruction I've seen in this forum, I did shrink my 4th Partition to create a 30GB unallocated free space to install Ubuntu 12.04. But, when next I'm trying to boot the Ubuntu CD and choosing "Something Else", its only recognizing my 500GB HDD in whole as "/sda" and not reading the free 30GB space separately to install Ubuntu in it as suggested in the instruction mentioned in this forum. I've also tried to install in from within Windows7, by mounting the Ubuntu ISO file and using the .exe file and instruction thereupon (choosing free drive, user name, installation size, etc.), but that also failed after the PC restarted to continue the installation, showing as error for file extension, partition something error. One thing to be noted that the PC I'm trying to install Ubuntu in it is my Home PC and doesn't have any internet connection. Hence, no updates or otherwise online help. What shall I do?? Kindly suggest. Sorry if I made some grammatical mistakes as English is not my first language. Thanks in advance.

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• RewriteRule in htaccess in subdirectory

  - by Jay

  Windows server, running Apache. In my Apache conf, I have AllowOverride None for the root of a site and then I have a subdirectory set to AllowOverride All: <Directory /> AllowOverride None </Directory> <Directory "/safe/"> AllowOverride All </Directory> However, when I try to set up a rewrite rule in the subdirectory's htaccess file, nothing happens, I just get a 404 page not found error. Example: RewriteEngine On RewriteRule (.*) /blah?test=$1 [R=302,NC,NE,L] Rwewriting URLs are working fine from the root via the Apache conf. I don't understand why the rule is ignored. I don't want to do the URL re-writing within the conf because for this case I may need to be changing the redirects constantly and don't want to reload the server every time a change is made. I also don't want to affect server performance by enabling htaccess files site-wide, just in the subdirectory I need it.

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• Why do my websites have a first page rank on Bing and Yahoo but not Google? [closed]

  - by Linda Cullum

  I have 3 websites suffering from a drop in ranking with Google and hence a huge drop in traffic. The instant drop ocurred in September and I have not been able to remedy it. For the past 6-10 years my main website http://LearnToSail.Net has ranked from #3 to #1 on the 1st page of Google and all the other engines with the search term "learn to sail" Now it shows on the 1st page of Bing and Yahoo but does not show up on ANY pages of Google. The only way it does come up is if I add "cd" to the "learn to sail" phrase. We sell a sailing cd on that website. The other websites are http://LearnToSailOnLine.com ..search terms are "learn to sail online" or learntosailonline and historyofthepilgrims.com search terms are "history of the pilgrims" "historyofthepilgrims" I get the same result. Gone on Google but 1st pages for Bing and Yahoo. I have researched, edited,updated blogs, made sitemaps, prayed to the universe and use Google Webmaster tools but nothing is changing and I have lost alot of business. I host with 1and1.com and have been back and forth with them but to no avail and no change in traffic. I thought maybe some DNS mapping was off. I used to have alot of traffic now I have hardly any. Any advice would be greatly appreciated. I am still in the process of working on the issue of course! This is a really great website here and I am glad I came across it. Thank you, LS Cullum Little Pines Multimedia

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• Is it viable to make a port from a C++ application to Java through LLVM

  - by Javier Mr

  how viable is it to port a C++ application to Java bytecode using LLVM (I guess LLJVM)? The thing is that we currently have a process written in C++ but a new client has made mandatory to been able to run the program in a multiplatform way, using the Java Virtual Machine with obviously no native code (no JNI). The idea is to be able to take the generated jar and copy then to different systems (Linux, Win, 32 bits - 64 bits) and it should just work. Looking around looks like it is possible to compile C++ to LLVM IR code and then that code to java bytecode. There is no need of the generated code to be readable. I have test a bit with similar things using emscripten, this takes C++ code and compile it to JavaScript. The result is valid JS but totally unreadable (looks like assambler). Does anybody done a port of an application from C++ to Java bytecode using this tecnique? What problems could we face? Is a valid approach for production code? Note: I am aware that currently we have some non standard C++ and close source libraries, we are looking to removing this non standard code and all close source libraries and use Free Libre Open Source Software, so lets suppose all code is standard C++ code with all code available at compile time. Note: It is not an option to write portable C++ code and then compile it to the desired target platform, the compiled program must be mltiplatform thus the use of JVM (right now we are not looking in similar solutions but Python or other language base, but i would also like to heard about it)

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• How to back up OWA exchange emails without Outlook

  - by fpghost

  My university uses Microsoft Outlook Web Access (OWA) e-mail. Soon they will close my e-mail account as my course has ended, but I really do not want to lose the archive of emails and attachments. I've read a backup to something called a .pst can be made if one has access to Microsoft Outlook but I do not. Is there any other way I could back these up? (preferably on Ubuntu 12.04 but I also have access to Win 7 if need be). One idea I played with is using davmail to allow access via Thunderbird and performing some kind of backup with that. However, I cannot seem to get past Authentication failed: invalid user or password, retry with domain\user.

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• How to prevent Network Manager from auto creating network connection profiles with "available to everyone" by default

  - by airtonix

  We have several laptops at work which use Ubuntu 11.10 64bit. I have our Wifi Access Point requiring WPA2-EAP Authentication (backed by a LDAP server). I have the staff using these laptops when doing presentations by using the Guest Account. So by default when you have a wifi card, network manager will display available Wireless Access Points. So the logical course of action for a Novice(tm) user is to single left click the easy to use option in the Network Manager drop down list... At this point the Staff Member (who is logged in with the guest account) expects to just be able to connect and enter any authentication details if required. But because they are using the Guest account, they won't ever have admin permissions (nor do I want them to), and so PolKit kicks in with a request for admin authorisation. I solved this part by modifying the PolKit permissions required to allow all users to create System Network Connections... However, because these Staff members are logging onto the Wifi Access Point with Ldap Credentials and because the Network Manager is now saving those credentials as a System Connection, their password is available for the next guest user session (because system connection profiles are stored in /etc/NetworkManager/system-connections.d/* ). It creates system connections by default because "Available to all users" is ticked by default when you quickly connect to a new wifi access point. I want Network Manager to not tick this by default. This way I can revert the changes I made to Polkit and users network connection profiles will be purged when they log out.

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• International Pricing of Software [closed]

  - by arachnode.net

  I operate a small company that charges $99 for a piece of software. I'd like to know what would be a fair price for non-US customers. Today I sold a license to a party in South Africa. He told me he had been watching the project for two years while business justification could be made for the purchase as SA's currency is nine times weaker than the US dollar. I found this resource detailing how much a Big Mac costs in various countries: http://howmuchatyourplace.com/how_much_does/Big%20Mac_cost.php I realize that the cost of producing a Big Mac varies from locale to locale as does the demand for one. I am aware that many software companies charge prices in local currencies that equate to the price in US dollars. I am aware that my costs remain fixed, and I obviously I cannot discount the rate at which my time costs me. I'm OK with earning less per sale as I would rather get my software onto the desktops of those that need it rather than having them try to write it themselves. Support is light and I can usually point a user to an existing blog or forum post. Being a resident of Hawaii, I am aware that certain goods and services cost more here. Power is up to six times as much per KWH as it is in, say, Seattle, and wages are approximately 60% of what they are for my profession (programmer). I'd like to offer my software at a price that would be fair for everyone around the globe. If a currency is 2 foreign units to 1 US dollar, and goods and services cost 50% more and pay for an equivalent job is 50% of what it is here, should I charge, say, $50 instead of $99? Is there a resource which would allow me to input a price in US dollars and adjust for a list of international locations?

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• How to get Apache web server to run on other computers?

  - by Eric

  I have been using Apache Web Server for a while now and one thing I have noticed is that outside of my computer I can not access it. I use my Apache server for PHP development on my computer, but I would like to access stuff I have made outside of my computer. I am on a linksys router network. I usually run it of http://localhost/ or http://127.0.0.1/. I IPCONFIGED my computer and got 192.168.1.105 so I went there with my browser and got the page just fine. I tried doing this on another computer on the same network but it didn't work. How do I fix this? Sorry about the bad wording. I am in ah hurry Information you might need to know: Server: Apache 2.2 Operating System: Windows 7 ULTIMATE

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• What are some ways to separate game logic from animations and the draw loop?

  - by TMV

  I have only previously made flash games, using MovieClips and such to separate out my animations from my game logic. Now I am getting into trying my hand at making a game for Android, but the game programming theory around separating these things still confuses me. I come from a background of developing non game web applications so I am versed in more MVC like patterns and am stuck in that mindset as I approach game programming. I want to do things like abstract my game by having, for example, a game board class that contains the data for a grid of tiles with instances of a tile class that each contain properties. I can give my draw loop access to this and have it draw the game board based on the properties of each tile on the game board, but I don't understand where exactly animation should go. As far as I can tell, animation sort of sits between the abstracted game logic (model) and the draw loop (view). With my MVC mindset, it's frustrating trying to decide where animation is actually supposed to go. It would have quite a bit of data associated with it like a model, but seemingly needs to be very closely coupled with the draw loop in order to have things like frame independent animation. How can I break out of this mindset and start thinking about patterns that make more sense for games?

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• MacBook repeatedly disconnects from Wi-Fi

  - by redwall_hp

  I have an early 2008-model MacBook (2.4 GHz). The Wi-Fi router I have at home is a Linksys WRT54GX2 that I have had for a few years. My MacBook has recently started disconnecting from the router every few minutes, which is rather annoying. I can reconnect again without having to restart the router or anything, as it seems that the MacBook is just dropping the connection. I have tried changing the channel on the router, and upgrading the laptop from Leopard to Snow Leopard made no difference either. I'm only about six feet from the Linksys device, so distance isn't an issue. This only happens with the Linksys router, while I can use the local library's open network without any issues. The problem also seemingly becomes more pronounced after midnight. What could the problem be? Edit: Here are the logs that Spiff requested: http://pastie.org/951761

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• .htaccess deny from all does not work?

  - by jeffery_the_wind

  I am running Apache 2.2.20 on a Ubuntu 11.04 web server. I have a Joomla site running on it, but I have also added some custom content. In the main web directly I have added a folder /images/sub_folder and in this sub_folder I have put a bunch of pictures. I do not want anyone to be able to simply access these pictures directly from the web, so I made a .htaccess file in that sub_folder and just put the following line in it: deny from all There doesn't seem to be any effect, I can still access the images directly from a web browser. I have restarted the Apache service. What am I doing wrong? Thanks Tim

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