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• How do I get a 300Mbps connection over 802.11n?

  - by Daniel Schaffer

  I just bought a new wireless setup, consisting of a Cisco E2000 router, Edimax 7718un USB adapter for my laptop and an Edimax 7728in PCI adapter for my HTPC (which isn't in a location I can run cat5 to). I have to stay in the 2.4GHz band because I have an iPhone and a Wii that will need to connect. I'm aware that 11g devices will drop speeds for 11n devices, but they aren't connected yet. The fastest connection I've been able to get, with the router within 5 feet of either the laptop or HTPC is 144Mbps. The router has settings for "20MHz" and "Auto (20 MHz or 40Mhz) channel width, which I've set to the "Auto" setting. I haven't been able to find anything similar for either of the Edimax adapters. This is the first I've dealt with 11n, so I'm not even sure what else could be causing a problem. How do I get up to 300Mbps, or at least a fair bit closer?

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• mongod fork vs nohup

  - by Daniel Kitachewsky

  I'm currently writing process management software. One package we use is mongo. Is there any difference between launching mongo with mongod --fork --logpath=/my/path/mongo.log and nohup mongod >> /my/path/mongo.log 2>&1 < /dev/null & ? My first thought was that --fork could spawn more processes and/or threads, and I was suggested that --fork could be useful for changing the effective user (downgrading privileges). But we run all under the same user (process manager and mongod), so is there any other difference? Thank you

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• IPTABLE & IP-routed netwok solution for HOST net and VM's subnet

  - by Daniel

  I've got ProxmoxVE2.1 ruled KVM node on Debian and bunch of VM's guests machine. That is how my networking looks like: # network interface settings auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address 175.219.59.209 gateway 175.219.59.193 netmask 255.255.255.224 post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp And I've got two working subnet solution auto vmbr0 iface vmbr0 inet static address 10.10.0.1 netmask 255.255.0.0 bridge_ports none bridge_stp off bridge_fd 0 post-up ip route add 10.10.0.1/24 dev vmbr0 This way I can reach internet, to resolve outside hosts, update and download everything I need but can't reach one guest VM out of any other VM's inside my network. The second solution allows me to communicate between VM's: auto vmbr1 iface vmbr1 inet static address 10.10.0.1 netmask 255.255.255.0 bridge_ports none bridge_stp off bridge_fd 0 post-up echo 1 > /proc/sys/net/ipv4/ip_forward post-up iptables -t nat -A POSTROUTING -s '10.10.0.0/24' -o vmbr1 -j MASQUERADE post-down iptables -t nat -D POSTROUTING -s '10.10.0.0/24' -o vmbr1 -j MASQUERADE I can even NAT internal addresses: -t nat -I PREROUTING -p tcp --dport 789 -j DNAT --to-destination 10.10.0.220:345 My inexperienced mind is ready to double VM's net adapters: one for the first solution and another - for second (with slightly different adresses) but I'm pretty sure that it's a dumb way to resolve the problem and everything can be resolved via iptables/ip route rules that I can't create. I've tried a dozen of "wizard manuals" and "howto's" to mix both solution but without success. Looking for an advice (and good reading links for networking begginers).

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• Apache: Assign SSL server / client certs to directories

  - by Daniel Amaya

  I have multiple directories on my system, e.g., /var/www/dir1 /var/www/dir2 /var/www/dir3 And what I'd like to do is to generate a server/client SSL certificate for each directory, and then set up each directory such that the client cert must match the server cert in order to access said directory. Now, if someone has the client cert for /var/www/dir2 and they try to access /var/www/dir1, they will be unable to do so since those directories use different certs. Each of these directories is hosted on the same domain (i.e., domain.com/dir1, domain.com/dir2). Now, the problem I am having is that I am not exactly sure how to accomplish this in Apache. (Also, I don't really care for domain.com to require SSL, but I do want the directories to require it.)

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• How do you open a folder in OSX using the keyboard?

  - by Daniel T.

  On Windows, pressing enter when you highlight on a folder in Windows Explorer will open that folder. On OSX, pressing enter when you highlight a folder edits the folder's name (like F2 in Windows). Is there a keyboard shortcut to do the same thing on Windows, so that you'll open the folder? It doesn't have to be enter, but I'd like to know if there's another hotkey that does it. The reason why I ask is because I like to navigate through deep folder structures by using the arrow keys for navigation and enter to drill down into them.

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• Looking for a software / something to automate some simple audio processing

  - by Daniel Magliola

  I'm looking for a way to take a 1-hour podcast MP3 file and split it into several several 2-minute MP3s. Along the way, I'd like to also do a few things like Amplify the volume. The problem I'm solving is that I have a crappy MP3 player that won't let me seek forward or backward, nor will it remember where I left it when I turn it off, plus, I listen to these in a seriously high-noise situation. Thus, I need to be able to skip forward in large chunks (2-5 minutes) to the point where I left it. Is there any decent way to do this? Audacity doesn't seem to have command-line capabilities. I'm willing to write some code, for example, to call something over the command line and get how long the MP3 file is, to later know how many pieces i'll have, and then say "create an MP3 with 0:00 to 2:00", "create an MP3 with 2:00 to 4:00", etc. I'm also willing to pay for the right tools if necessary. I also don't care how slow this runs, as long as I can automate it :-) I'm doing this on Windows. Any pointers / ideas? Thanks!

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• TF2010 Build Definition and Access to Path is Denied error?

  - by Daniel DiVita

  I am new to TFS with regards to build definitions. I have a a build folder setup where I have set the permissons so EVERYONE has full control. Here is the exact error I am getting: E:\Builds\PIMSite\PIM.Site\PIM_Site.metaproj: Unable to copy file "C:\Builds\1\PIM System\PIM Site Build\Binaries\HtmlAgilityPack.xml" to "..\PIM.Site\Bin\HtmlAgilityPack.xml". Access to the path '..\PIM.Site\Bin\HtmlAgilityPack.xml' is denied. I have tried everyhitng. I have removed everything from that folder adn can delete it just fine so it is not being used by another process. Any thoughts?

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• Simple IPV6 Address Question

  - by Daniel

  Hello, I have a /96 block of IPV6 addresses and i'm wondering how i could some how find the next address (Since ipv6 addresses can contain numbers and letters). I know the first address could be in numbers but i've yet to find out how i could really find in some kind of order for that amount of addresses E.G: What technique could i use to make sure i'll actually be able to use all of the addresses

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• How to clean this Dell Precision M6400

  - by Daniel Pratt

  I have (well, ok, my employer has and I use) a Dell Precision M6400 notebook. It's a decent piece of hardware, but I have at least one major gripe: It's a dust and...uh...crumb (I repent! I repent!) magnet! And I cannot seem to exorcise the dust/crumbs from it! There is a strip of metal above the keyboard that is punched full of tiny holes. Well, maybe it's better to describe them as 'pits'. If a sufficiently small particle finds its way into one of those pits, there is only about a 50% that I will manage to get it out. Consequently, there is now a chorus of tiny little particles silently chiding me about eating cookies a cracker whilst I browse the intarwebs. Does anyone have any suggestions about how I could remove these particles from this machine...while still preserving the function of the machine?

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• Developing high-performance and scalable zend framework website [on hold]

  - by Daniel

  We are going to develop an ads website like http://www.gumtree.com/ (it will not be like this one but just to give you an ideea) and we are having some issues regarding performance and scalability. We are planning on using Zend Framework for this project but this is all that I'm sure off at this point. I don't think a classic approch like Zend Framework (PHP) + MySQL + Memcache + jQuery (and I would throw Doctrine 2 in there to) will fix result in a high-performance application. I was thinking on making this a RESTful application (with Zend Framework) + NGINX (or maybe MongoDB) + Memcache (or eAccelerator -- I understand this will create problems with scalability on multiple servers) + jQuery or maybe throw Backbone.js in there, a CDN for static content, a server for images and a scalable server for the requests and the rest. My questions are: - What do you think about my approch? - What solutions would you recommand for developing an high performance, scalable application expected to have a lot of traffic using PHP(Zend Framework 2)...I would be interested in your approch. I should note that I'm a Zend developer, I'm working with Zend for over 3 years, this is why I'm choosing it.

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• What's the strengths and weaknesses of existing configuration management systems?

  - by Daniel C. Sobral

  I was looking up here for some comparisons between CFEngine, Puppet, Chef, bcfg2, AutomateIt and whatever other configuration management systems might be out there, and was very surprised I could find very little here on Server Fault. For instance, I only knew of the first three links above -- the other two I found on a related google search. So, I'm not interested in what people think is the best one, or which they like. I'd like to know the following: Configuration Management System's name. Why it was created (as opposed to using an existing solution). Relative strengths. Relative weaknesses. License. Link to project and examples.

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• SSD suddenly full

  - by Daniel

  Today the hard drive of our server was suddenly full. The disk usage always stayed around 50 % in the weeks and months before (old data is regularly expunged from the server). I deleted 10 GB of files in /tmp, which strangely freed 51 GB. Here is what I did: root@***:~# df -h Dateisystem Size Used Avail Use% Eingehängt auf /dev/sda3 139G 137G 0 100% / tmpfs 3,9G 0 3,9G 0% /lib/init/rw udev 3,9G 116K 3,9G 1% /dev tmpfs 3,9G 0 3,9G 0% /dev/shm /dev/sda1 985M 25M 910M 3% /boot root@***:/var# du -hs * 3,3M backups 438M cache 9,4G lib 4,0K local 12K lock 76M log 24K mail 4,0K opt 88K run 184K spool 10G tmp 12K www root@***:/var/tmp# find -type f -print0 | xargs -0 rm root@***:/var/tmp# df -h Dateisystem Size Used Avail Use% Eingehängt auf /dev/sda3 139G 81G 51G 62% / tmpfs 3,9G 0 3,9G 0% /lib/init/rw udev 3,9G 116K 3,9G 1% /dev tmpfs 3,9G 0 3,9G 0% /dev/shm /dev/sda1 985M 25M 910M 3% /boot Any explanation as to why deleting 10 GB in /tmp gave me back 51 GB on the disk? Could this point to an SSD failure? Are there any tools for Debian to test SSD health? I already have checked syslog. The first entry relating to this incidient is a mysql message: 1:22:02 [ERROR] /usr/sbin/mysqld: Disk is full writing... So I have absolutely no idea what caused this.

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• Microsoft Exchange mail features and AD question

  - by Daniel Fukuda

  Hello, I wanted to ask is there a feature that allows Microsoft Exchange to download emails through POP3 from another mail provider like Google Apps (Gmail for your own domain), then store it and allowing users to download (POP3/IMAP) emails to Outlook/Live Mail. So I want to Microsoft Exchange to become like middle mail provider. My another question is regarding Microsoft Server Active Directory, is Windows Server 2008 Active Directory working with Windows XP Professional and is there any new feature added to Win2k8 AD?

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• How do I verify that Time Machine backed up my system properly?

  - by Daniel

  I just used Apple's Time Machine for the first time on my new laptop...I wonder if everything backed up ok, what is the best way to check?

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• On clients use generic driver for printer shared by CUPS

  - by Daniel

  I know this worked really easy with a recent CUPS version some years ago. Unfortunately I fail to do the following with latest CUPS nowadays. How to share a printer without using printer specific drivers on the clients with CUPS? The printer is a Samsung ML-2010. The important fact is that it needs a quite specific library for printing called splix. That is installed on the server and prints well. What makes trouble is using that printer over the network. I found out how to use Avahi under Linux to make use of DNSSD to advertise and discover printers. But as far as I understand the new CUPS offers the internal driver interface on the network. This has 2 major issues: anybody can fiddle with the driver and I don't trust any uncommon printer library to be "network secure" anyone who wants to use my printer including guests needs to install the specific drivers first I remember the old days when I could enable "Share this printer" on the CUPS server and all clients would magically detect the printer and just send their job data to the server and have it do the driver stuff. After everything a read I guess this is related to the changes Apple introduced with CUPS including dropping of the integrated network discovery protocol. If it helps: Server: Ubuntu LTS 12.04 Server with CUPS 1.5.3 Client: Arch Linux with current CUPS 1.6.1 On another box with Ubuntu the printer was setup automatically at least but the mechanism used the Splix library for that.

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• HAProxy crashes on all requests in 1.5-dev12

  - by Daniel Hough

  I'm having an issue where HAProxy is crashing with no explanation when I switch from 1.4.12 to 1.5-dev12. The reason I'm switching is for the SSL offloading. My config file doesn't have any errors, it's quite simple and it works well with 1.4 - but for some reason when I run it with 1.5-dev12 I see the logs noting that the two backends I have have been set up, and then when I hit one of the frontends, I get an HTTP 400 in the browser and suddenly HAProxy isn't running anymore when I check. I understand that a common workaround to the lack of SSL support for HAProxy is to use Stud, and I may go with that since I am in need of an SSL solution for my service, but before I dele into that world I thought I might see if anybody has experienced the same problems and might know how to fix it. The server is Ubuntu 10.04 and I followed the make instructions on the Exceliance blog here. EDIT: On the advice of Kyle Brandt, I did a bit more investigation. I attached gdb to the haproxy process and when the crash occurred this is what I got: Program received signal SIGSEGV, Segmentation fault. 0x0804e5c2 in dequeue_all_listeners (list=0x9e1a418) at src/protocols.c:184 184 list_for_each_entry_safe(listener, l_back, list, wait_queue) { P.S. HAProxy is awesome, so thank you Exceliance for providing us with something so useful :)

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• Windows 7 Paging file apparently not being used

  - by Daniel F.

  I'm running Windows 7 Home Premium 32bit on a mobo with 24GB RAM. Of those 24GB, 20GB are assigned as a RAMDISK via ASRock XFastRAM. This RAMDISK has the drive letter X assigned to it. On X:\ I'm storing the temporary files folder, as well as pagefile.sys. Pagefile.sys has 6GB of size. The X:\ has usually around 14GB free space, so the temporary files are negligible, it's mostly the browsers which are storing their caches on there. Now my issue is that Firefox is crashing a lot on me, no error message pops up, but I know that this is because it's out of memory. I could kind of live with that, but now that I switched from using Eclipse to Android Studio, I know that I'm in trouble, because Java isn't capable of allocating, and Android Studio, together with the Java instances it launches, is quite a memory hog. So I tried to figure out what's wrong, and apparently Windows isn't swapping out memory onto the paging file. While my applications are crashing (firefox) / not starting (java vm's), the paging file is only using constantly around 15% of its size (checked with the performance monitor). 15% equals to 1GB aprox. I know that the correct solution would be to switch to 64 bit Windows, but I had to use the 32 bit version because of driver issues which I had about two years ago, and I guess that I'll have them again if I reformat and install the 64 bit version. Also, the machine is running quite stable, the only issue is the memory, so I'd like to use it as it is (as the apps are installed and configured) Is there a way to make Windows use the paging file more efficiently? None of my processes require more than 1GB, I'd just like it to swap out some seldomly used stuff, like GoogleCrashHandler.exe and stuff like that in order to have "more physical memory avaliable". Is that possible?

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• logfile deleted on Oracle database how to re-create it?

  - by Daniel

  for my database assignment we were looking into 'database corruption' and I was asked to delete the second redo log file which I have done with the command: rm log02a.rdo this was in the $HOME/ORADATA/u03 directory. Now I started up my database using startup pfile=$PFILE nomount then I mounted it using the command alter database mount; now when I try to open it alter database open; it gives me the error: ORA-03113: end-of-file on communication channel Process ID: 22125 Session ID: 25 Serial number: 1 I am assuming this is because the second redo log file is missing. There is still log01a.rdo, but not the one I have deleted. How can I go about recovering this now so that I can open my database again? I have looked into the database created scripts, and it specified the log02a.rdo file to be size 10M and part of group 2. If I do select group#, member from v$logfile; I get: 1 /oradata/student_db/user06/ORADATA/u03/log01a.rdo 2 /oradata/student_db/user06/ORADATA/u03/log02a.rdo 3 /oradata/student_db/user06/ORADATA/u03/log03a.rdo 4 /oradata/student_db/user06/ORADATA/u03/log04a.rdo So it is part of group 2. If I try to add the log02a.rdo file again "already part of the database". If I drop group 2 and then add it again with these commands: ALTER DATABASE ADD LOGFILE GROUP 2 ('$HOME/ORADATA/u03/log02a.rdo') SIZE 10M; Nothing. Supposedly alters the database, but it still won't start up. Any ideas what I can do to re-create this and be able to open my database again?

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• Why are PNG-8 files mangled when opened in Photoshop?

  - by Daniel Beardsley

  Why are some 32 bit PNGs opened in Photoshop with Indexed Colors and no transparency? For instance, I grabbed a png icon file of the Stack Overflow logo at: http://blog.stackoverflow.com/wp-content/uploads/icon-so.png When opening it in Photoshop CS3, it apparently treats it as indexed color and gets rid of the alpha channel. The image on the right is a screen grab of the icon. Changing the Image mode in Photoshop to RGB doesn't change the image at all. I've tried this with a few other PNGs and it seems hit or miss. When viewed in other programs, it displays fine. left:png opened in Photoshop, right:screen grab of png from browser What gives?, does Photoshop not interpret the PNG file format correctly?

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• Serious 64-bit laptop

  - by Daniel Gehriger

  For the past couple of years, I have been using an IBM Thinkpad T60p for daily work (software development, desktop & embedded). I am extremely satisfied with this machine, due to its robustness. It also has a few features I depend on: a high resolution display: 15.0" TFT FlexView display with 1600x1200 (UXGA); excellent keyboard; decent graphics and CPU performance. Some of the software I develop benefits from larger amounts of RAM, and 3GB (Windows 7 32-bit) or 4GB (Windows 7 64-bit on T60p) are no longer sufficient. My customers run desktop computers with 20GB and more, and I need to have at least 8GB to at least be able to run reasonable test cases. So I'm shopping around for a new laptop, but I'm struggling to find anything that matches my requirements: must run Windows 7 64-bit Pro or higher; must support at least 8GB of RAM (more is better) high screen resolution! While I prefer 4:3 I can live with wide screen. But I really hope to find something with a vertical screen resolution similar to what I have now... portable, so < 16" but = 14" I realize that FlexView isn't available anymore, but I'd like to avoid a glossy screen if possible. decent (not more) graphics performance, ideally hybrid (I'm doing a lot of CAD, never games). good keyboard reasonable CPU -- but I'm still fine with my current Core 2 Duo, so that shouldn't be too complicated. The T60p fits all those requirements, except the 8GB of RAM. Can you help me find a current notebook that would match most of them? I don't mind changing brand. Thanks!

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• Windows 7 - Can't get my TV working as primary display with nVidia 7900GS

  - by Daniel Schaffer

  I just installed Windows 7 Ultimate 64 RTM (from MSDN) on my HTPC, which is connected to a 42" Magnavox LCD TV via component cables to my nVidia 7900GS. Everything was fine through the installation until I went to install the official driver from nVidia. Towards the end of the installation, the TV blinked off and wouldn't come back on. I went and got an LCD monitor and plugged it into a DVI port and the monitor came right up, but was automatically selected as the primary display. Now, if I set the TV to be the primary display, the TV just blanks until I hit escape to cancel the "settings have changed, do you want to keep them" dialog. Any suggestions? Update: I'm able to set the TV as the primary display using the Windows 7 "screen resolution" configuration panel. However, if I try to remove the LCD monitor either by unplugging it or using the configuration, the TV blanks out again. Update 2: This setup was working correctly in Vista Home Premium 32-bit. Update 3: I've uninstalled the nVidia driver and am using the driver that Windows Update installed. As much as this offends my geek sensibilities (must use the "right" driver!!), well, It Works™.

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• Mac failing (failed?) hard drive - is all hope lost?

  - by Daniel

  It's a 500 GB Seagate laptop hard drive that came with my Macbook Pro. Apple partition format. Already replaced and now have it external, connected via SATA/USB adapter. Trying to get just a few files that I worked on while out of town when it crashed (and thus did not have my time machine backup drive). Drive will not mount, but OS X Disk Utility detects it and can read the capacity, model number, and even the name of the partition, which leads me to believe all hope may not be lost. Failed attempts so far: Disk Utility verify+repair says drive cannot be repaired and that I should back up immediately (lovely) Disk Warrior says it cannot rebuild the directory due to hardware failure Data Rescue quick & deep scans immediately failed PhotoRec says "error reading sector" for every sector (at least for the few minutes I let it run before closing it to explore other options) What else can I try here? Again, I'm just looking for a few, small files (python scripts to be specific) - not a full recovery.

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• Apache Balancing by source IP

  - by Daniel

  I am using Apache's Proxy Balancer to balance one sub domain (e.g. subdomain.domain.com) to an application which is located on 2 servers. Here an extract from my Apache configuration file: <Proxy *> Order deny,allow Allow from all </Proxy> <Proxy balancer://cluster1> BalancerMember http://server1:28081 route=w1 BalancerMember http://server2:28082 route=w2 </Proxy> ProxyPass /path balancer://cluster1/path ProxyPassReverse /path balancer://cluster1/path My question is, if it's possible to decide with the source IP-address which BalancerMember should be used for the request? To e.g. Requests from 1.2.3.4 to Member 1?

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• Is paravirtualization evil?

  - by Daniel

  I have an VMWare ESX Server v3.5 with a few virtualized Debian Lenny VMs (kernel 2.6.22 with vmi) running Apache Tomcat 5.5. I enabled paravirtualization, and Disk IO increased from about 240MB/s to 380MB/s, making me a happy admin. The problem now is that my apache tomcat becomes deadlocked during startup, running with 200% CPU (I have 2 CPUS assigned to the VM), and don't know how to get both: A stable system and a fast system. I somewhere heared that paravirtualization is legacy anyway and won't be available on newer ESX servers. Is there a replacement for this seemingly performance-improving option, or is it discontinued becauses it is just unstable? What is the state of paravirtualization? Should I ignore it completely? Thanks for all answers in advance.

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• MS Windows issue - "Filename or extension is too long"

  - by Daniel

  I run Microsoft windows on a few of my machines. I don't know if many people know about this issue in the OS but you can't have very long filenames, from what I know Linux can have longer names, I have never run into this issue on my Linux machines. Anyway I run into issues whenever copying folders & files to backup drives. I manually backup of my data, finding and changing names of files, this is very very tedious. Is there a software tool to shorten folders or filenames that are found to be to long on Windows? I have drive image duplication software which does the job but in a way that I don't like, plus moving files can become a hassle at times if the names are too long to copy.

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