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• wmic output well formed xml on remote queries

  - by Mervin

  I want to use the WMI command line tool (wmic) to get information about windows computers on the network and output it as valid xml. However, I can't seem to find the right way to do this as the outputted xml currently contains invalid tokens for which I think I should use the /TRANSLATE:basicxml switch. The command: wmic /NODE:"tech-demo" /IMPLEVEL:Impersonate /USER:MyUser /PASSWORD:MyPassword /PRIVILEGES:DISABLE /AUTHLEVEL:Pkt /AUTHORITY:"ntlmdomain:companydomain.local" PATH Win32_LogicalDisk GET * /FORMAT:rawxml This command runs but returns invalid xml tokens ('<' and '' I think? edit: it appears to fail parsing at ‹) When I add the translate switch I get the message: Can not use credentials for local connections a bit strange that it tries to query the local pc when I add the switch.. Help would be greatly appreciated.

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• Tips on ensuring Model Quality

  - by [email protected]

  Given enough data that represents well the domain and models that reflect exactly the decision being optimized, models usually provide good predictions that ensure lift. Nevertheless, sometimes the modeling situation is less than ideal. In this blog entry we explore the problems found in a few such situations and how to avoid them.1 - The Model does not reflect the problem you are trying to solveFor example, you may be trying to solve the problem: "What product should I recommend to this customer" but your model learns on the problem: "Given that a customer has acquired our products, what is the likelihood for each product". In this case the model you built may be too far of a proxy for the problem you are really trying to solve. What you could do in this case is try to build a model based on the result from recommendations of products to customers. If there is not enough data from actual recommendations, you could use a hybrid approach in which you would use the [bad] proxy model until the recommendation model converges.2 - Data is not predictive enoughIf the inputs are not correlated with the output then the models may be unable to provide good predictions. For example, if the input is the phase of the moon and the weather and the output is what car did the customer buy, there may be no correlations found. In this case you should see a low quality model.The solution in this case is to include more relevant inputs.3 - Not enough cases seenIf the data learned does not include enough cases, at least 200 positive examples for each output, then the quality of recommendations may be low. The obvious solution is to include more data records. If this is not possible, then it may be possible to build a model based on the characteristics of the output choices rather than the choices themselves. For example, instead of using products as output, use the product category, price and brand name, and then combine these models.4 - Output leaking into input giving the false impression of good quality modelsIf the input data in the training includes values that have changed or are available only because the output happened, then you will find some strong correlations between the input and the output, but these strong correlations do not reflect the data that you will have available at decision (prediction) time. For example, if you are building a model to predict whether a web site visitor will succeed in registering, and the input includes the variable DaysSinceRegistration, and you learn when this variable has already been set, you will probably see a big correlation between having a Zero (or one) in this variable and the fact that registration was successful.The solution is to remove these variables from the input or make sure they reflect the value as of the time of decision and not after the result is known. 

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• Setting effects variables in XNA

  - by Badescu Alexandru

  Hello ! I am currently reading a book named "3D Graphics with XNA Game Studio 4.0" by Sean James and have some questions to ask : If i create a effect parameter named lets say SpecularPower and have in my effect a variable named SpecularPower , if i do something like effect.Parameters["SpecularPower"].SetValue(3) That wil change the SpecularPower variable in my effect ? And a second question, not regarding the book : If i have a spaceship and i've created a "boost" functionality that speeds up my spaceship, what effects should i implement to create the impresion oh high speed ? I was thinking of making everything except my spaceship blurry but i think there would be something missing . Any ideas ? Regards, Alex Badescu

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• Transfer .com domain to GoDaddy - websites running on same domain - 3 weeks left until expiration, 2 days left web hosting

  - by Eric Nguyen

  Our company purchased this abc.com domain from a local registrar. The domain will expire in about 3 weeks. We have our main websites running on this abc.com domain and they cannot be down for too long. The web hosting service will end in 2 days. Our websites are already hosted and they are up and running on Amazon EC2. We would like to transfer the domain to GoDaddy now or as soon as possible. (since we have many other domains there and we belive GoDaddy will be better in long-term considering the prices and the features it offers) There are many questions on the decision to transfer the domain to GoDaddy: 1) Cost and time required to move out of our local registrar? This is currently unknown as I'm still trying to retrieve the agreement we have with them 2) How does the 3 week time left until expiration of the domain matters here? Should we wait until the domain expires and then purchase in through GoDaddy? How long would such process take as I suppose our websites will be down during that time? Any other drawbacks? 3) What can I do to ensure our websites will continue functioning regardless of the domain transfer process? It seems the actual registrar here is enom.com and the local registrar here just partners with it I suppose I should then park the abc.com domain with enom.com and make changes to DNS settings so that our websites can continue to be hosted on EC2 as normal. How long does it normally take the domain to be transferred to GoDaddy completely? Is it even possible at all to keep our websites are up and running during the whole domain transfer process? Apologies that I'm throwing many questions at the same time here. It's rather last minutes and I suddenly realised there are too many unknown risks.

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• How to change location of Maildir/ in postfix mail system

  - by adesh

  I'm using Postfix with imap and pop servers running on ubuntu linux. I want to change the the location of Maildir folder from user's home directory to some other shared folder so that all mail is in one place. I also have problem sending local mails to users who does not have a home directory (e.g. www-data), the system users created by default. I'm getting the following error. postfix/local[32123]: DCE1D221BBD: to=<www-data@********>, orig_to=<www-data>, relay=local, delay=33, delays=33/0/0/0.12, dsn=5.2.0, status=bounced (maildir delivery failed: create maildir file /var/www/Maildir/tmp/1382169296.P32123.********: Permission denied) I'd like to have a folder structure similar to this: /all-mail/<user-name>/<mail-goes-here>

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• How do I set up DNS for an intranet web site?

  - by BradyKelly

  I have a web site running on our local server, 'OBAMA'. In my hosts file on that server, I map engenxt.local to 127.0.0.1, so typing engenxt.local on that machine itself brings up the website. I would like other machines to access the site via domain name 'engenxt'. On a Windows Server 2008 R2 Standard server, where would I begin, where should I go, and where should I end? I know precious little about DNS, or rather precious nothing, but am a quick study, besides, that is why I'm asking how to do this here. Episode 2 When I run DNS as Ryan suggests, it says 'the server OBAMA is unavailable. Do I want to add it?' It adds it, and tells me to choose to 'Configure a DNS server' from the actions menu, but nearly all the actions in that menu are disabled.

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• Apache server in raspberry PI not visible from outside( public IP)

  - by Kronos

  I have made a fresh install of Arch Linux ARM into a Raspberry PI and I mounted there a LAMP, all fresh. I have another Arch(x86) in my laptop with Apache also there, and as far as I know, two web servers cannot run in the same network segment so, the problem is as follows. I my laptop, having Apache running, if I enter via the public ip of my network everything turns ok and I can see my website but, (obviously turning this server down) if I enter from the public IP with the Apache running in the raspberry pi( yes, only that Apache running) i cannot see my website in there. Also, if I access via local network it is a normal success, I can see my website. So, I can enter my raspberry website only via local but in my other web server i can enter it via local and public. I have the same conf files in both of them so what is the difference? I was planning in making the rpi as a development server. Thanks in advance

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• Is it bad to have an "Obsessive Refactoring Disorder"?

  - by Rachel

  I was reading this question and realized that could almost be me. I am fairly OCD about refactoring someone else's code when I see that I can improve it. For example, if the code contains duplicate methods to do the same thing with nothing more than a single parameter changing, I feel I have to remove all the copy/paste methods and replace it with one generic one. Is this bad? Should I try and stop? I try not to refactor unless I can actually make improvements to the code performance or readability, or if the person who did the code isn't following our standard naming conventions (I hate expecting a variable to be local because of the naming standard, only to discover it is a global variable which has been incorrectly named)

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• How can OpenGL graphics be displayed remotely using VNC?

  - by Jared Brown

  I am attempting to run a program that uses OpenGL to render a model in a viewport through VNC unsuccessfully. The error message I receive is - Xlib: extension "GLX" missing on display ":1.0". It was my understanding that VNC can be configured to render all graphics remotely and send a compressed screen grab from the display buffer to the local client. This would seem to negate the need for GLX extensions on the local client. Can VNC be configured this way and could you briefly describe how? Remote host: vncserver on RHEL 5 Local client: UltraVNC on Windows XP

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• "Server not found" for live version of site

  - by user1491819

  I can access my local dev site on my local pc, eg: http://mysite But I cannot access the live site, even though it works fine on other pc's: http://www.mysite.com The live site gives the error in Firefox: Server Not Found. Pinging www.mysite.com gives the error:"Ping request could not find host www.mysite.com" hosts file: 127.0.0.1 mysite I changed the hosts file to the following and rebooted: 127.0.0.1 mysitedev I'm running on XP, and have cleared the DNS cache using: ipconfig /flushdns I have verified the live site is up using: http://www.isup.me/ and the site loads fine using my phone. What could be preventing my local pc from accessing the live site?

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• Unable to connect to sites using IIS7 Manager

  - by Phil.Wheeler

  I'm a developer who has been assigned the task of managing and configuring a new IIS7 instance on a remote server. My domain account has been added as to the local Administrators group on the box, but IIS7 has been configured to accept connections only from accounts with Windows credentials. I've added my domain account to the IIS Manager Permissions for one of my sites, but I'm still unable to connect to either that site, the IIS instance or the server in general from my local machine. There's obviously a missing element to the configuration of this setup but I don't know where to start looking. The event logs on the IIS box show audit failures for my account when trying to connect remote via the IIS7 Manager tool on my local machine. Suggestions gratefully received.

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• rsync creating thousands of ..ds_store files from mounted volume

  - by daniel Crabbe

  I've been using rsync on OS X to sync all our website admins. It was working fine until the OS X 10.6.3 update! Now it creates thousands of empty (0-kb) folders. It only does it when synching to a mounted network drive (which we need to do) as when I sync to my local drive it works as usual! I've tried excludes which don't seem to be working... also tried a different version of rsync so it's an OS X issue. echo "" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" echo " SYNCING up KINEMASTIK" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" /usr/local/bin/rsync -aNHAXv --progress --exclude-from 'exclude.txt' /Volumes/Groups/Projects/483_Modern_Activity_Website/web/youradmin/ /Users/dan/Dropbox/documents/WORK/kinemastik/WEBSITE/youradmin/ echo "" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" echo " SYNCING up CHRIS BROOKS YOURADMIN" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" /usr/local/bin/rsync -aNHAXv --progress --exclude-from 'exclude.txt' /Volumes/Groups/Projects/483_Modern_Activity_Website/web/youradmin/ /Volumes/Groups/Projects/516_ChrisBrooks/website/youradmin/ Has anyone experienced the same problem?

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• How to install PHP, Pear, PECL, and APC with Homebrew on Mac OS X?

  - by Andrew

  I'm trying to install APC for PHP 5.3 in the easiest way possible. I love Homebrew so I started down that route. I was able to install PHP 5.3.6 with this command: brew install https://github.com/adamv/homebrew-alt/raw/master/duplicates/php.rb --with-mysql I think this is supposed to install PHP, Pear, and PECL. It seems to install these just fine. Now when I try to install APC: $ pecl install apc downloading APC-3.1.9.tgz ... Starting to download APC-3.1.9.tgz (155,540 bytes) .................................done: 155,540 bytes Warning: require_once(Archive/Tar.php): failed to open stream: No such file or directory in PackageFile.php on line 305 Warning: require_once(Archive/Tar.php): failed to open stream: No such file or directory in /usr/local/Cellar/php/5.3.6/lib/php/PEAR/PackageFile.php on line 305 Fatal error: require_once(): Failed opening required 'Archive/Tar.php' (include_path='/usr/local/Cellar/php/5.3.6/lib/php') in /usr/local/Cellar/php/5.3.6/lib/php/PEAR/PackageFile.php on line 305 How can I fix this?

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• Apache HTTPS ProxyPass certificate location

  - by oz1cz

  I'm trying to set up an Apache server that uses ProxyPass to pass HTTPS requests on to another server. Let's call the proxy server ALPHA and the target server BETA. ALPHA does not run HTTPS, but BETA does. I first tried using this virtual host specification on ALPHA: <VirtualHost *:443> ServerName mysite.com ProxyPass / https://192.168.1.105/ # BETA's IP address ProxyPassReverse / https://192.168.1.105/ # BETA's IP address ProxyPreserveHost On ProxyTimeout 600 SSLProxyEngine On RequestHeader set Front-End-Https "On" CacheDisable * </VirtualHost> But when I tried this, Apache complained saying, "[error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile]". I had to copy the SSL certificate from BETA to ALPHA and add these lines to the host specification on ALPHA: SSLEngine on SSLCertificateKeyFile /usr/local/ssl/private/BETA_private.key SSLCertificateFile /usr/local/ssl/crt/BETA_public.crt SSLCertificateChainFile /usr/local/ssl/crt/BETA_intermediate.crt Now the system works. But I have a feeling that I have done something wrong or unnecessary. I have the web site's private key and certificate lying on both ALPHA and BETA. Is that necessary? Should I have done it differently?

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• firehol (firewall) with bridge: how to filter

  - by Leon

  I have two interfaces: eth0 (public address) and lxcbr0 with 10.0.3.1. I have a LXC guest running with ip 10.0.3.10 This is my firehol config: version 5 trusted_ips=`/usr/local/bin/strip_comments /etc/firehol/trusted_ips` trusted_servers=`/usr/local/bin/strip_comments /etc/firehol/trusted_servers` blacklist full `/usr/local/bin/strip_comments /etc/firehol/blacklist` interface lxcbr0 virtual policy return server "dhcp dns" accept router virtual2internet inface lxcbr0 outface eth0 masquerade route all accept interface any world protection strong #Outgoing these protocols are allowed to everywhere client "smtp pop3 dns ntp mysql icmp" accept #These (incoming) services are available to everyone server "http https smtp ftp imap imaps pop3 pop3s passiveftp" accept #Outgoing, these protocols are only allowed to known servers client "http https webcache ftp ssh pyzor razor" accept dst "${trusted_servers}" On my host I can connect only to "trusted servers" on port 80. In my guest I can connect to port 80 on every host. I assumed that firehol would block that. Is there something I can add/change so that my guest(s) inherit the rules of the eth0 interface?

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• RoundhousE now supports Oracle, SQL2000

  - by Robz / Fervent Coder

  RoundhousE, the database migration software that is based on sql scripts has added support for Oracle and SQL 2000.  There have also been numerous other little things, including better logging and a script run errors table. The script errors table captures what went wrong when/if your scripts are not quite up to par or there is some other issue. A special thanks goes out to http://twitter.com/PascalMestdach and http://twitter.com/jochenjonc. They worked hard on this and all I did was provide guidance and help bring it back to the trunk. This is what an entry in the database looks like: This is a preview of new log: ================================================== Versioning ================================================== Attempting to resolve version from C:\code\roundhouse\code_drop\sample\deployment\_BuildInfo.xml using //buildInfo/version. Found version 0.5.0.188 from C:\code\roundhouse\code_drop\sample\deployment\_BuildInfo.xml. Migrating TestRoundhousE from version 0 to 0.5.0.188. Versioning TestRoundhousE database with version 0.5.0.188 based on http://roundhouse.googlecode.com/svn. ================================================== Migration Scripts ================================================== Looking for Update scripts in "C:\code\roundhouse\code_drop\sample\deployment\..\db\TestRoundhousE\up". These should be one time only scripts. -------------------------------------------------- Running 0001_CreateTables.sql on (local) - TestRoundhousE. Running 0002_ChangeTable.sql on (local) - TestRoundhousE. Running 0003_TestBatchSplitter.sql on (local) - TestRoundhousE. -------------------------------------------------- But what are you waiting for? Head out and grab the latest release today!

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• C++ difference between "char *" and "char * = new char[]"

  - by nashmaniac

  So, if I want to declare an array of characters I can go this way char a[2]; char * a ; char * a = new char[2]; Ignoring the first declaration, the other two use pointers. As far as I know the third declaration is stored in heap and is freed using the delete operator . does the second declaration also hold the array in heap ? Does it mean that if something is stored in heap and not freed can be used anywhere in a file like a variable with file linkage ? I tried both third and second declaration in one function and then using the variable in another but it didn't work, why ? Are there any other differences between the second and third declarations ?

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• Why enumerator structs are a really bad idea

  - by Simon Cooper

  If you've ever poked around the .NET class libraries in Reflector, I'm sure you would have noticed that the generic collection classes all have implementations of their IEnumerator as a struct rather than a class. As you will see, this design decision has some rather unfortunate side effects... As is generally known in the .NET world, mutable structs are a Very Bad Idea; and there are several other blogs around explaining this (Eric Lippert's blog post explains the problem quite well). In the BCL, the generic collection enumerators are all mutable structs, as they need to keep track of where they are in the collection. This bit me quite hard when I was coding a wrapper around a LinkedList<int>.Enumerator. It boils down to this code: sealed class EnumeratorWrapper : IEnumerator<int> { private readonly LinkedList<int>.Enumerator m_Enumerator; public EnumeratorWrapper(LinkedList<int> linkedList) { m_Enumerator = linkedList.GetEnumerator(); } public int Current { get { return m_Enumerator.Current; } } object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { return m_Enumerator.MoveNext(); } public void Reset() { ((System.Collections.IEnumerator)m_Enumerator).Reset(); } public void Dispose() { m_Enumerator.Dispose(); } } The key line here is the MoveNext method. When I initially coded this, I thought that the call to m_Enumerator.MoveNext() would alter the enumerator state in the m_Enumerator class variable and so the enumeration would proceed in an orderly fashion through the collection. However, when I ran this code it went into an infinite loop - the m_Enumerator.MoveNext() call wasn't actually changing the state in the m_Enumerator variable at all, and my code was looping forever on the first collection element. It was only after disassembling that method that I found out what was going on The MoveNext method above results in the following IL: .method public hidebysig newslot virtual final instance bool MoveNext() cil managed { .maxstack 1 .locals init ( [0] bool CS$1$0000, [1] valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator CS$0$0001) L_0000: nop L_0001: ldarg.0 L_0002: ldfld valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator EnumeratorWrapper::m_Enumerator L_0007: stloc.1 L_0008: ldloca.s CS$0$0001 L_000a: call instance bool [System]System.Collections.Generic.LinkedList`1/Enumerator::MoveNext() L_000f: stloc.0 L_0010: br.s L_0012 L_0012: ldloc.0 L_0013: ret } Here, the important line is 0002 - m_Enumerator is accessed using the ldfld operator, which does the following: Finds the value of a field in the object whose reference is currently on the evaluation stack. So, what the MoveNext method is doing is the following: public bool MoveNext() { LinkedList<int>.Enumerator CS$0$0001 = this.m_Enumerator; bool CS$1$0000 = CS$0$0001.MoveNext(); return CS$1$0000; } The enumerator instance being modified by the call to MoveNext is the one stored in the CS$0$0001 variable on the stack, and not the one in the EnumeratorWrapper class instance. Hence why the state of m_Enumerator wasn't getting updated. Hmm, ok. Well, why is it doing this? If you have a read of Eric Lippert's blog post about this issue, you'll notice he quotes a few sections of the C# spec. In particular, 7.5.4: ...if the field is readonly and the reference occurs outside an instance constructor of the class in which the field is declared, then the result is a value, namely the value of the field I in the object referenced by E. And my m_Enumerator field is readonly! Indeed, if I remove the readonly from the class variable then the problem goes away, and the code works as expected. The IL confirms this: .method public hidebysig newslot virtual final instance bool MoveNext() cil managed { .maxstack 1 .locals init ( [0] bool CS$1$0000) L_0000: nop L_0001: ldarg.0 L_0002: ldflda valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator EnumeratorWrapper::m_Enumerator L_0007: call instance bool [System]System.Collections.Generic.LinkedList`1/Enumerator::MoveNext() L_000c: stloc.0 L_000d: br.s L_000f L_000f: ldloc.0 L_0010: ret } Notice on line 0002, instead of the ldfld we had before, we've got a ldflda, which does this: Finds the address of a field in the object whose reference is currently on the evaluation stack. Instead of loading the value, we're loading the address of the m_Enumerator field. So now the call to MoveNext modifies the enumerator stored in the class rather than on the stack, and everything works as expected. Previously, I had thought enumerator structs were an odd but interesting feature of the BCL that I had used in the past to do linked list slices. However, effects like this only underline how dangerous mutable structs are, and I'm at a loss to explain why the enumerators were implemented as structs in the first place. (interestingly, the SortedList<TKey, TValue> enumerator is a struct but is private, which makes it even more odd - the only way it can be accessed is as a boxed IEnumerator!). I would love to hear people's theories as to why the enumerators are implemented in such a fashion. And bonus points if you can explain why LinkedList<int>.Enumerator.Reset is an explicit implementation but Dispose is implicit... Note to self: never ever ever code a mutable struct.

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• Suspending my laptop breaks ethernet over firewire, are there commands which can fix it?

  - by Josh

  As mentioned in this question I am using a firewire cable to provide a private network between my laptop and my desktop, because it makes using the screen sharing program synergy much nicer than using WIFI. However when I leave my office for the day and I suspend my laptop, when I return the next day, the desktop and the laptop cannot communicate over firewire anymore. The firewire0 device still has an IP address. but when I try and ping the desktop I get no route to host I'm using kernel 2.6.35-24-generic #42-Ubuntu SMP x86_64 on Ubuntu 10.10. Is there some way I can remedy this without a reboot? Like, removing some kernel modules and re-inserting them? Here's what I have tried so far and the results: root@token:~# dmesg|tail -n 1 [592525.204024] firewire_core: phy config: card 0, new root=ffc1, gap_count=5 root@token:~# modprobe -r firewire_net firewire_ohci firewire_core root@token:~# modprobe -v firewire_ohci insmod /lib/modules/2.6.35-24-generic/kernel/lib/crc-itu-t.ko insmod /lib/modules/2.6.35-24-generic/kernel/drivers/firewire/firewire-core.ko insmod /lib/modules/2.6.35-24-generic/kernel/drivers/firewire/firewire-ohci.ko root@token:~# dmesg|tail [592525.204024] firewire_core: phy config: card 0, new root=ffc1, gap_count=5 [592563.410868] firewire_ohci: Removed fw-ohci device. [592579.160086] firewire_ohci: Added fw-ohci device 0000:02:00.0, OHCI v1.10, 4 IR + 8 IT contexts, quirks 0x2 [592579.160137] firewire_ohci: isochronous cycle inconsistent [592579.660294] firewire_core: created device fw0: GUID 0000000000000000, S400 [592579.663805] firewire_core: created device fw1: GUID 0017f2fffe89bce6, S400 [592579.663813] firewire_core: phy config: card 0, new root=ffc1, gap_count=5 [592579.700720] firewire_core: phy config: card 0, new root=ffc1, gap_count=5 [592579.700842] firewire_core: refreshed device fw0 [592579.702603] firewire_net: firewire0: IPv4 over FireWire on device 0000000000000000 root@token:~# ping stan.firewire PING stan.firewire (192.168.100.1) 56(84) bytes of data. From token.local (192.168.100.3) icmp_seq=1 Destination Host Unreachable From token.local (192.168.100.3) icmp_seq=2 Destination Host Unreachable From token.local (192.168.100.3) icmp_seq=3 Destination Host Unreachable I also tried removing the modules prior to suspending, and re-inserting after resuming. This did not work either :-(

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• Missing APR on apache2 ./configure

  - by arby

  I want to build the latest stable version of apache2. I downloaded the source and put APR & APR-util in the srclib folder, then changed directories to ./srclib/apr and ran: ./configure --prefix=/usr/local/apr sudo make sudo make install This seemed to install APR ok, but when I run ./configure from the apr-util directory, I receive the error: configure: error: APR could not be located. Please use the --with-apr option. Using ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr, the error becomes: checking for APR... configure: error: the --with-apr parameter is incorrect. It must specify an install prefix, a build directory, or an apr-config file. Why can't it find APR?

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• Project Euler 2: (Iron)Python

  - by Ben Griswold

  In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 2.  As always, any feedback is welcome. # Euler 2 # http://projecteuler.net/index.php?section=problems&id=2 # Find the sum of all the even-valued terms in the # Fibonacci sequence which do not exceed four million. # Each new term in the Fibonacci sequence is generated # by adding the previous two terms. By starting with 1 # and 2, the first 10 terms will be: # 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... # Find the sum of all the even-valued terms in the # sequence which do not exceed four million. import time start = time.time() total = 0 previous = 0 i = 1 while i <= 4000000: if i % 2 == 0: total +=i # variable swapping removes the need for a temp variable i, previous = previous, previous + i print total print "Elapsed Time:", (time.time() - start) * 1000, "millisecs" a=raw_input('Press return to continue')

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• what could cause a script to fail to find python when it has `#!/usr/bin/env python` in the first line?

  - by jcollum

  Trying to get casperjs running on Ubuntu 12.04. After installing it when I run I get: 09:20 $ ll /usr/local/bin/casperjs lrwxrwxrwx 1 root root 26 Nov 6 16:49 /usr/local/bin/casperjs -> /opt/casperjs/bin/casperjs 09:20 $ /usr/bin/env python --version Python 2.7.3 09:20 $ cat /opt/casperjs/bin/casperjs | head -4 #!/usr/bin/env python import os import sys 09:20 $ casperjs : No such file or directory 09: 22 $ python Python 2.7.3 (default, Sep 26 2013, 20:03:06) [GCC 4.6.3] on linux2 So Python is present and runnable, casperjs is pointing to the right place and it is a python script. But when I run it I get "No such file". I can fix it by changing the first line of the casperjs python file from: #!/usr/bin/env python to: #!/usr/bin/python Result: $ casperjs --version 1.1.0-DEV I managed to fix it, but I'm wondering why it didn't work with #!/usr/bin/env python, since that seems to be a normal interpreter line. Do I have something configured wrong? Here are the steps to get casperjs: $ git clone git://github.com/n1k0/casperjs.git $ cd casperjs $ ln -sf `pwd`/bin/casperjs /usr/local/bin/casperjs $ casperjs : No such file or directory

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• Multiple PHP versions running as cgi

  - by Pierre

  I'm trying to install a second version of PHP, to run alongside the current version of php. I've compiled the latest php source from github (5.5-DEV), and I'm trying to run it as CGI. Here is my virtual host config: <VirtualHost *:8055> DocumentRoot /Library/WebServer/Documents/ ScriptAlias /cgi-bin/ /usr/local/php55/cgi Action php55-cgi /cgi-bin/php-cgi AddHandler php55-cgi .php <Directory /Library/WebServer/Documents/> Options Indexes FollowSymLinks Includes ExecCGI AllowOverride All Order Allow,Deny Allow from all </Directory> DirectoryIndex index.html index.php </VirtualHost> But when I go to http://127.0.0.1:8055/info.php, I get the following error: Forbidden You don't have permission to access /cgi-bin/php-cgi/info.php on this server Edit I'm now switching between LoadModule php5_module /usr/local/php54/libphp5.so and LoadModule php5_module /usr/local/php55/libphp5.so It works for now, but is not ideal. I would like to have the different versions of php on different virtual hosts

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• ssh login successful, but scp password gives me "Permission denied"

  - by YANewb

  I'm trying to get some blogging software up on an organizational remote server. I tried to set up a SSH Key but was having problems and decided that getting the blog up and running was more important than dealing with the SSH Key issue, so I ssh-keygen -R remoteserver.com. Now I can successfully login with ssh -v [email protected] and the correct password. Once logged in I can move around and read any file and directory that I should be able to read. But when I try to edit an existing -rw-r--r-- file with VIM, it shows up as read-only, if I try to edit permissions I get chmod: file.ext: Operation not permitted, and if I try to scp a new file from my local machine I'm prompted for the remote user's password, and then get scp: /home/path/to/file.ext: Permission denied. Since I didn't have any of these problems before I tried to set up the ssh key, I suspect these anomalies are a side effect of that, but I don't know how to troubleshoot this. So what does a foolish server-newb, such as myself, need to do to get edit capability back as a remote user? Addendum 1: My userids are different between my local machine and the remote server. For ssh I ssh -v [email protected]. if I whoami I get remoteuser For scp I scp file.ext [email protected]:/path/to/file.ext from the local directory with file.ext while logged in as the local user. if I whoami I get localuser The ls -l for two different files I've tried scp: -rw-r--r--@ 1 localuser localgroup 20 Feb 11 21:03 phpinfo.php -rw-r--r-- 1 root localgroup 4 Feb 11 22:32 test.txt The ls -l for the file I've tried to VIM: -rw-r--r-- 1 remoteuser remotegroup 76 Jul 27 2009 info.txt Addendum 2: In the past I've set up ssh-keys for git repositories. I don't want to completely destroy them, so in an attempt to follow a deer's train of thinking I renamed my ~/.ssh/ to ~/.ssh-bak/, then tested the different types of access. The abridged version of the terminal commands and results is below; I think everything is working until the 8th line from the end. localcomputer:~ localuser$ ssh -v [email protected] OpenSSH_5.2p1, OpenSSL 0.9.8l 5 Nov 2009 debug1: Reading configuration data /etc/ssh_config debug1: Connecting to remoteserver.com [###.###.###.###] port 22. debug1: Connection established. debug1: identity file /Users/localuser/.ssh/identity type -1 debug1: identity file /Users/localuser/.ssh/id_rsa type -1 debug1: identity file /Users/localuser/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.8p2 FreeBSD-20110503 debug1: match: OpenSSH_5.8p2 FreeBSD-20110503 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY The authenticity of host 'remoteserver.com (###.###.###.###)' can't be established. RSA key fingerprint is ##:##:##:##:##:##:##:##:##:##:##:##:##:##:##:##. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'remoteserver.com,###.###.###.###' (RSA) to the list of known hosts. debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/localuser/.ssh/identity debug1: Trying private key: /Users/localuser/.ssh/id_rsa debug1: Trying private key: /Users/localuser/.ssh/id_dsa debug1: Next authentication method: password [email protected]'s password: debug1: Authentication succeeded (password). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. Last login: Sun Feb 12 18:00:54 2012 from 68.69.164.123 FreeBSD 6.4-RELEASE-p8 (VKERN) #1 r101746: Mon Aug 30 10:34:40 MDT 2010 [remoteuser@remoteserver /home]$ ls -l total ### -rw-r--r-- 1 remoteuser remotegroup 76 Aug 12 2009 info.txt [remoteuser@remoteserver /home]$ vim info.txt ~ {at the bottom of the VIM screen it tells me it's [read only]} [remoteuser@remoteserver /home]$ whoami remoteuser [remoteuser@remoteserver /home]$ logout debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0 debug1: channel 0: free: client-session, nchannels 1 Connection to remoteserver.com closed. Transferred: sent 3872, received 12496 bytes, in 107.4 seconds Bytes per second: sent 36.1, received 116.4 debug1: Exit status 0 localcomputer:localdirectory name$ scp -v phpinfo.php [email protected]:/home/www/remotedirectory/phpinfo.php Executing: program /usr/bin/ssh host remoteserver.com, user remoteuser, command scp -v -t /home/www/remotedirectory/phpinfo.php OpenSSH_5.2p1, OpenSSL 0.9.8l 5 Nov 2009 debug1: Reading configuration data /etc/ssh_config debug1: Connecting to remoteserver.com [###.###.###.###] port 22. debug1: Connection established. debug1: identity file /Users/localuser/.ssh/identity type -1 debug1: identity file /Users/localuser/.ssh/id_rsa type -1 debug1: identity file /Users/localuser/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.8p2 FreeBSD-20110503 debug1: match: OpenSSH_5.8p2 FreeBSD-20110503 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'remoteserver.com' is known and matches the RSA host key. debug1: Found key in /Users/localuser/.ssh/known_hosts:1 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/localuser/.ssh/identity debug1: Trying private key: /Users/localuser/.ssh/id_rsa debug1: Trying private key: /Users/localuser/.ssh/id_dsa debug1: Next authentication method: password [email protected]'s password: debug1: Authentication succeeded (password). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Sending command: scp -v -t /home/www/remotedirectory/phpinfo.php Sending file modes: C0644 20 phpinfo.php Sink: C0644 20 phpinfo.php scp: /home/www/remotedirectory/phpinfo.php: Permission denied debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: channel 0: free: client-session, nchannels 1 debug1: fd 0 clearing O_NONBLOCK debug1: fd 1 clearing O_NONBLOCK Transferred: sent 1456, received 2160 bytes, in 0.6 seconds Bytes per second: sent 2322.3, received 3445.1 debug1: Exit status 1

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• Segfault with rtorrent on Debian Lenny

  - by digital

  Hi, My debian lenny server keeps segfaulting with rtorrent, it happens once every 24 hours. Libcurl has been recompiled to the latest version and it still seems to happen. I'm not the best when it comes to linux server admin but if you require more info about the system I'll try and get it for you. lib/rtorrent are 0.8.5/0.12.5 Any help would be appreciated as I'd like rtorrent up 24/7 Caught Segmentation fault, dumping stack: 0 rtorrent [0x439686] 1 rtorrent [0x43e06a] 2 /lib/libc.so.6 [0x7f73ce780f60] 3 /usr/lib/libcurl.so.4 [0x7f73d04f4431] 4 /usr/lib/libcurl.so.4 [0x7f73d04f47da] 5 /usr/lib/libcurl.so.4(curl_multi_remove_handle+0x341) [0x7f73d050acb1] 6 rtorrent [0x480221] 7 rtorrent [0x482915] 8 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1f95] 9 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1fea] 10 /usr/local/lib/libtorrent.so.11 [0x7f73d02b4cfc] 11 rtorrent [0x48058a] 12 rtorrent [0x439f49] 13 /lib/libc.so.6(__libc_start_main+0xe6) [0x7f73ce76d1a6] 14 rtorrent(_ZNSt8ios_base4InitD1Ev+0x71) [0x40ea99]

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