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• Install VirtualBox on Ubuntu 12.04.1 (on [Samsung] Chromebook)

  - by iphonedev7

  I have dual booted Ubuntu Linux 12.04.1 LTS on my Samsung Series 5 ChromeBook, and am trying to run/install Oracle VirtualBox (from the generic .run file downloaded from their website). However, every time I try to run it (as root from the command line), it gives me the following error occurs: Please install the build and header files for your current Linux kernel. The current kernel version is 3.4.0 Problems were found which would prevent VirtualBox from installing. I have tried the version from the Software Center, as well as the command line installation, both of which gave me errors based on my linux-headers/linux-kernel/linux-[kernel]-image. Here's an error I keep getting (on the command line): First Installation: checking all kernels... It is likely that 3.4.0 belongs to a chroot's host Building only for 3.5.0-18-generic Building initial module for 3.5.0-18-generic ERROR (dkms apport): kernel package linux-headers-3.5.0-18-generic is not supported Error! Bad return status for module build on kernel: 3.5.0-18-generic (x86_64) Consult /var/lib/dkms/virtualbox/4.1.12/build/make.log for more information. Setting up virtualbox-qt (4.1.12-dfsg-2ubuntu0.2) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place ...And one of the more cryptic errors I get when trying to start any Virtual Machine: Result Code: NS_ERROR_FAILURE (0x80004005) Component: Machine Interface: IMachine {5eaa9319-62fc-4b0a-843c-0cb1940f8a91}

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• Turn Excel spreadsheet into a formula

  - by ?????? ??????????

  I have an Excel spreadsheet that has a complex computation that is not trivial to turn into a macro or a single-cell formula. The spreadsheet has a about 10 different inputs (values a human enters in different cells of the spreadsheet) and then it outputs 5 independent calculations (in different 5 cells) based on that input. There calculation is using some pre-entered data in the spreadsheet (about 100 different constants) and doing some look-ups on them. Now I would like to use this whole spreadsheet as a formula on a different spreadsheet to calculate a set of input values and produce the corresponding set of output values. Imagine this as creating different table with 10 columns for the input variables and 5 columns for the outputs, then copying each input into the other spreadsheet and copying back the output in the results table. For instance: - A1, A2, A3,... A10 are cells where someone enters values - through a series of calculations B1, B2, B3, B4 and B5 are updated with some formulas Can I use the whole series of calculations from A1..A10 into B1..B5 without creating one massive huge formula or a VBA macro? I want to have a set of input values in 100 rows from A100, B100, C100,... J100 onward. Then do some Excel magic that will: 1. copy the values from A100...J100 into A1 to A10 2. wait for the result to appear in B1 to B5 3. copy the values from B1 to B5 into K100 to O100 4. repeat steps 1 to 3 for all rows from 100 to 150

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• Replacing quotes in a file

  - by Matthijs

  I have a large number of large semicolon-separated data files. All string fields are surrounded by double quotes. In some of the files, there are extra quotes in the string fields, which messes up the subsequent importing of the data for analysis (I'm importing to Stata). This code allows me to see the problematic quotes using gnu-awk: echo '"This";"is";1;"line" of" data";""with";"extra quotes""' | awk 'BEGIN { FPAT = "([^;]+)|(\"[^\"]+\")"}; {for ( i=1 ; i<=NF ; i++ ) if ($i ~ /^"(.*".*)+"$/) {print NR, $i}}' 1 "line" of" data" 1 ""with" 1 "extra quotes"" but I do not know how to replace them. I was thinking of doing the replace manually, but it turns out that there are several hundred matches in some of the files. I know about awk's -sub-, -gsub-, and -match- functions, but I am not sure how to design a search and replace for this specific problem. In the example above, the respective fields should be "This", "is", 1, "line of data", "with", "extra quotes", that is: all semicolons are separators, and all quotes except for the outermost quotes should be removed. Should I may be use -sed-, or is -awk- the right tool? Hope you can help me out! Thanks, Matthijs

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• Permanently deleting files on Mac OS

  - by Jonik

  A while back, as relatively new Mac OS X user, I was surprised to learn that you cannot easily delete files. Directly, that is, without moving them to the trash first. On Windows and Linux this can obviously be done with ease, but not so on the Mac. I noticed this when trying clear up files from a USB memory stick — removing the files ("move to trash") does not free up space; that happens only after emptying the whole system-wide Trash. Not particularly convenient! (It seems stupid to have to empty the whole trashcan just to make some space on the USB stick. There might be gigabytes of stuff in there, and this sort of defeats its purpose - what if you'd actually need to restore something from the trash some day.) So, what's your way of getting around this? Have you bought a 3rd party application like RAW Trash for $16.95 just to delete files, or do you diligently empty the trashcan whenever needed? Or did I miss something? Also, can you convince me that this is actually the way it should be — that users shouldn't be able to fiddle with the filesystem easily? :)

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• What are the frequencies of current in computers' external peripheral cables and internal buses?

  - by Tim

  From Wikipedia, three different cases of current frequency are discussed along with the types of cables that are suitable for them: An Extra Ordinary electrical cables suffice to carry low frequency AC, such as mains power, which reverses direction 100 to 120 times per second (cycling 50 to 60 times per second). However, they cannot be used to carry currents in the radio frequency range or higher, which reverse direction millions to billions of times per second, because the energy tends to radiate off the cable as radio waves, causing power losses. Radio frequency currents also tend to reflect from discontinuities in the cable such as connectors, and travel back down the cable toward the source. These reflections act as bottlenecks, preventing the power from reaching the destination. Transmission lines use specialized construction such as precise conductor dimensions and spacing, and impedance matching, to carry electromagnetic signals with minimal reflections and power losses. Types of transmission line include ladder line, coaxial cable, dielectric slabs, stripline, optical fiber, and waveguides. The higher the frequency, the shorter are the waves in a transmission medium. Transmission lines must be used when the frequency is high enough that the wavelength of the waves begins to approach the length of the cable used. To conduct energy at frequencies above the radio range, such as millimeter waves, infrared, and light, the waves become much smaller than the dimensions of the structures used to guide them, so transmission line techniques become inadequate and the methods of optics are used. I wonder what the frequencies are for the currents in computers' external peripheral cables, such as Ethernet cable, USB cable, and in computers' internal buses? Are the cables also made specially for the frequencies? Thanks!

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• Application runs fine manually but fails as a scheduled task

  - by user42540

  I wasn't sure if this should go here or on stackoverflow. I have an application that loads some files from a network share (the input folder), extracts certain data from them and saves new files (zips them with SharpZLib) on a different network share (output folder). This application runs fine when you open it directly, but when it is set to a scheduled task, it fails in numerous places. This application is scheduled on a Win 2003 server. Let me say right off the bat, the scheduled task is set to use the same login account that I am currently logged in with, so it's not because it's using the LocalSystem account. Something else is going on here. Originally, the application was assigning a drive letter to the input folder using WNetGetConnectionA(). I don't remember why this was done, someone else on our team did that and she's gone now. I think there was some issue with using the WinZip command line with a UNC path. I switched from the WinZip command line utility to using SharpZLib because there were other issues with using the WinZip command line. Anyway, the application failed when trying to assign a drive letter with the error "connection already established." That wasn't true and even after trying WNetCancelConnection(), it still didn't work. Then I decided to just map the drive manually on the server. Then when the app calls Directory.Exists(inputFolderPath) it returns false, even though it does exist. So, for whatever reason, I cannot read this directory from within the application. I can manually navigate to this folder in Windows Explorer and open files. The app log file shows that the user executing it on the schedule is the user I expect, not LocalSystem. Any ideas?

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• Setting up xpra for client use in OS X

  - by Jonathan

  I've been trying to get xpra to run on OS X for the last few days to connect to my Ubuntu server. Note that there's a GUI for it called shifter, but that (at least on OS X) is still far too buggy. For those who don't know what xpra is, if you know what screen is, it's like screen for GUI X Windows apps tunneled over ssh. You can render a remote X app locally so it's faster than sending a series of compresses screen shots (like VNC), but with xpra you can disconnect and reconnect on different computers. To get the basic functionality you can just type "ssh -X server.location" and any GUI app you open from the command line will open locally. I've been able to get xpra to build by doing the following: Download pari-all-0.0.6.tar.gz from the xpra site listed under upstream and untar it. Issue the following Mac Ports command (Dependencies thanks to RogBlog): sudo port install python25 python26 py26-pyrex py26-gtk xorg-libXtst py25-gobject py25-gtk py25-nose py26-nose xorg-libXdamage xorg-libXcomposite xorg-libXtst xorg-libXfixes In the upstream list of v0.0.06 patches (NOT 0.0.8pre!) on the xpra site listed above, download mswindows-conditional-pyrex.patch. Open the patch with your favorite text editor and change the single occurrence of "win" in it to "darwin". Apply the patch to setup.py. Run do-build in the command line. Now where I'm stumped: how do I run xpra? The build produces a sub directory called install/bin in which xpra is located, but when I try to run it I get the following error: Traceback (most recent call last): File "./xpra", line 4, in import xpra.scripts.main ImportError: No module named xpra.scripts.main There is a file called main.py under xpra/scripts, but I don't know any python and I'm not sure if this is what it's looking for, and what to do with it even if it is. My goal is to set up xpra so I can install it into /usr/bin (or some other common path for executables) and execute it whenever I please. What do I do next?

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• Understanding !d command in sed with respect to saves

  - by richardh

  I have a directory of tab-delimited text files and some have comments in the first few lines that I would like to delete. I know that the first good line starts with "Mark" so I can use /^Mark/,$!d to delete these comments. After this deletion I have several other replacements that I make in the (new) first line that has variable names. My question is, why do I have to save sed's output to get my script to work? I understand that if I line is deleted, then the output doesn't proceed downstream because there is no output. But if I don't delete (i.e., !d) then why do I have to save to file? Thanks! Here is my shell script. (I'm a sed newbie, so any other feedback is also appreciated.) #!/bin/bash for file in *.txt; do mv $file $file.old1 sed -e '/^Mark/,$!d' $file.old1 > $file.old2 sed -e '1s/\([Ss]\)hareholder/\1hrhldr/g'\ -e '1s/\([Ii]\)mmediate/\1mmdt/g'\ -e '1s/\([Nn]\)umber/\1o/g'\ -e '1s/\([Cc]\)ompany/\1o/g'\ -e '1s/\([Ii]\)nformation/\1nfo/g'\ -e '1s/\([Pp]\)ercentage/\1ct/g'\ -e '1s/\([Dd]\)omestic/\1om/g'\ -e '1s/\([Gg]\)lobal/\1lbl/g'\ -e '1s/\([Cc]\)ountry/\1ntry/g'\ -e '1s/\([Ss]\)ource/\1rc/g'\ -e '1s/\([Oo]\)wnership/\1wnrshp/g'\ -e '1s/\([Uu]\)ltimate/\1ltmt/g'\ -e '1s/\([Ii]\)ncorporation/\1ncorp/g'\ -e '1s/\([Tt]\)otal/\1ot/g'\ -e '1s/\([Dd]\)irect/\1ir/g'\ $file.old2 > $file rm -f $file.old* done

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• wild card redirects issue giving error this webpage has a redirect loop

  - by david

  In my website I changed or better word modified the directory name ""vehicles-cars"" to ""vehicles-cars-for-sale"" when i tried to redirect using wild card redirect my old directory name to new directory name in my web hosting cpanel account. every time when i open pages from that directory i am getting error code. This web-page has a redirect loop. The website is php. The problem is that that my lots of pages from old directory are indexed in googles and they are getting duplicate contents. If I redirect single page it works perfect but there are lots of pages so I need wild card redirect to redirect whole directory . I really need some advice what to do with this problem. Here is .htaccess file code for redirect thanks RewriteEngine on RewriteCond %{HTTP_HOST} ^example\.com$ [OR] RewriteCond %{HTTP_HOST} ^www\.example\.com$ RewriteRule ^vehicles\-cars\/?(.*)$ "http\:\/\/example\.com\/vehicles\-cars\-for\-sale\/$1" [R=301,L] i have other wilcard redirect of whole directory with same code and its working perfect here is the code in .htaccss file which is same as above and working perfect for this directory RewriteCond %{HTTP_HOST} ^adsbuz\.com$ [OR] RewriteCond %{HTTP_HOST} ^www\.adsbuz\.com$ RewriteRule ^autos\/?(.*)$ "http\:\/\/adsbuz\.com\/vehicles\-cars\-for\-sale\/$1" [R=301,L] so i dont understand whats wrong with the above code please i really need some expert advice thanks again

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• Why doesn't Mail.app properly thread Microsoft Outlook replies?

  - by thepurplepixel

  I use Mail.app 3.6 (on 10.5 Leopard), and I always use plain-text email. Normally, when I receive an email reply from practically anyone, it looks like this (test message sent from Mail.app, replied from Hotmail, replied from Google Apps): Needless to say, I quite like this threading, and it keeps everything very visually-organized. However, when I receive a plain-text email reply from people on Microsoft Outlook (tested with Outlook 2003 & 2007), it isn't threaded like the image. Instead, it appears as below, without being threaded nicely. My reply to the message. -----Original Message----- From: Tyson Moore [mailto:[email protected]] Sent: [Date] To: [Receiver] Subject: Test Original message. Through looking at the source of my original message, it appears as though every time the message is quoted, less-than signs (<) are inserted before every line in the reply. I am assuming this is what triggers the quoting behaviour exhibited by Mail.app, but I'm no expert. My question: is this a Mail.app limitation in not recognizing the -----Original Message----- line put in by Outlook, or an Outlook problem not inserting > before every line in a reply (or both)?

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• Execute encrypted files but don't let anybody read them.

  - by Stebi

  I want to provide a virtual machine image with an installed web application. The user should be able to boot the vm (don't login, just boot) and a webserver should start automatically. The point is I want to hide the (ruby) source code of the web application from everyone as there is no obfuscator for ruby. I thought I could use file system encryption to encrypt the directory with the sourcecode (or even a whole partition). But the webserver user must be able to read it automatically after booting. Nobody is allowed to login as the webserver user (or any other user) so no other can read the contents. My questions are now: Is this possible? Because I give away the whole vm everybody could mount its virtual discs and read them (except the encrypted one). Is it now possible to find the key the webserver user needs to decrypt the files and decrypt them manually? Or is it safe to give such a vm away? The problem is that everything needed to decrypt must be included somewhere in the vm else the webserver cannot start automatically. Maybe I'm completely wrong and you have another tip for me securing the source code.

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• terminal-window viewer for tab-delimited files in *nix?

  - by khedron

  I work with a lot of tab-delimited data files, with varying columns of uncertain length. Typically, the way people view these files is to bring them down from the server to their Windows or Mac machine, and then open them up in Excel. This is certainly fully-featured, allowing filtering and other nice options. But sometimes, you just want to look at something quickly on the command line. I wrote a bare-bones utility to display the first<n>lines of a file like so: --- line 1 --- 1:{header-1} 2:{header-2} 3:... --- line 2 --- 1:{data-1} 2:{data-2} 3:... This is, obviously, very lame, but it's enough to pipe through grep, or figure out which header columns to use "cut -f" on. Is there a *nix-based viewer for a terminal session which will display rows and columns of a tab-delimited file and let you move the viewing window over the file, or otherwise look at data? I don't want to write this myself; instead, I'd just make a reformatter which would replace tabs with spaces for padding so I could open the file up in emacs and see aligned columns. But if there's already a tool out there to do something like this, that'd be great! (Or, I could just live with Excel.)

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• TLS_REQCERT and PHP with LDAPS

  - by John

  Problem: Secure LDAP queries via command-line and PHP to an AD domain controller with a self-signed certificate. Background: I am working on a project where I need to enable LDAP look-ups from a PHP web application to a MS AD domain controller that is using a self-signed certificate. This self-signed certificate is also using a domain name that is not a FQDN - think of something like people.campus as the domain name. The web application would take the user's credentials and pass them on to the AD domain controller to verify if the credntials are a match or not. This seems simple, but I am having problems trying to get PHP and the self-signed certificate to work. Some people have suggested that I changed the TLS_REQCERT variable from "request" to "never" within the OpenLDAP configuration. I am concerned that this might have larger implications such as a man-in-the-middle attack and I am not comfortable changing this setting to never. I have also read some places online where one can take a certificate and place it as a trusted source within the openldap configuration file. I am curious if that is something that I could do for the situation that I have? Can I, from the command line, obtain the self-signed certificate that the AD domain controller is using, save it to a file, and then have openldap use that file for the trust that it needs so that I do not need to adjust the variable from request to never? I do not have access to the AD domain controller and as a result cannot export the certificate. If there is a way to obtain the certificate from the command line, what commands do I need to use? Is there an alternate method of handling this issue that would be better in the long run? I have some CentOS servers and some Ubuntu servers that I am working with to try and get this going on. Thanks in advance for your help and ideas.

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• How to play individual albums in iTunes?

  - by Herb Caudill

  I know of two ways to play one specific album in iTunes: Do a search that's specific enough to include just that album and no other tracks; press a "Play album" button. (Doesn't work in cover flow or list view.) Go to list view; turn on column browser; in View/Column Browser, make sure "Albums" is showing; double-click an album name. These are fine as far as they go, but: Double-clicking an album in cover flow will play the album, and then keep going (in alphabetical order). That's no good. In playlists like "Purchased" or "Recently Added", you can either view and play whole albums, or sort by date added; you can't do both. In general, there's no straightforward way to get from a track in a playlist to the whole album it belongs to. What I would really, really like, would be to right-click on any song or album cover, anywhere, and choose "Play album". While I'm waiting for Apple to add that, any tips for simple album-centric listening?

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• LAMP Setup, PHP's session_start permission denied

  - by Andrew

  I'm trying to set up a development environment for a legacy system that runs CentOS 4.8, PHP 4.3.9, and MySQL 4.1.22. I'm matching OS and software versions to keep the development server as close to the production server as possible. When I fire up PHPMyAdmin's setup script (version 2.11.10.1, of course) the installation errors out and I see these errors in my error log: [client 172.18.141.74] PHP Warning: session_start(): open(/var/lib/php/session/sess_b5b90f86bd3dcfad315ff24cb7483a79, O_RDWR) failed: Permission denied (13) in /home/www/intranet/phpmyadmin/libraries/session.inc.php on line 87 [client 172.18.141.74] PHP Warning: Unknown(): open(/var/lib/php/session/sess_b5b90f86bd3dcfad315ff24cb7483a79, O_RDWR) failed: Permission denied (13) in Unknown on line 0 [client 172.18.141.74] PHP Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in Unknown on line 0 I've done some searching on ServerFault and on teh Googles and I see that a common reason for this error is that the session.save_path isn't writable by the www user. I also found where in /etc/php.ini this URL is set: session.save_path. My session.save_path is set to: session.save_path = /var/lib/php/session I've since changed the owner and the group of /var/lib/php/session and still have the same error. Here's the result of ls -la for /var/lib/php [root@localhost php]# ls -la total 24 drwxrwxr-x 3 www www 4096 Oct 23 20:21 . drwxr-xr-x 17 root root 4096 Oct 23 20:31 .. drwxrwx--- 2 www www 4096 Jun 1 2009 session ...But I'm still getting the same error. Is there another possibility for why I'm getting this error?

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• make pentaho report for ubuntu 11.04

  - by Hendri

  currently i'm trying to install Pentaho Reports for OpenERP which is refer from https://github.com/WillowIT/Pentaho-...rver/build.xml i ever installed on some laptops which is Windows Based and it's working, but currently i'm trying on UBuntu 11.04 OS, it prompted me error like this "error build.xml:18: failed to create task or type.." below is the steps i did : 1. install java-6-openjdk comment : "apt-get install java-6-openjdk" then i set installed java jdk into java_home environment command: "nano /etc/environment" add environment with this new line : JAVA_HOME="/usr/lib/jvm/java-6-openjdk" I install apache ant command : "apt-get install ant" followed by setting the evnironment command: "nano /etc/environment" add environment with this new line : ANT_HOME="/usr/share/ant" try to check installation with command "ant"... I get message like this: Buildfile: build.xml does not exist! Build failed then download java server from https://github.com/WillowIT/Pentaho-...rver/build.xml and then copied to Ubuntu share folder and then on command form, i goto extracted path which is share folder i mentioned and executed command "ant war " and i got error message : BUILD FAILED /share/java_server/build.xml:18: problem: failed to create task or type antlibrg:apacge.ivy.ant:retrieve cause: The name is undefined. Action:Check the spelling. Action:Check that any custom taks/types have been declared Action:Check that any /declarations have taken place. No types or taks have been defined in this namespace yet This appears to be an antlib declaration. Action:Check that the implementing library exists in one of: -/usr/share/ant/lib -/root/.ant/lib -a directory added on the command line with the -lib argument Total time:0 seconds is there any compability issue? or i miss out some steps? i'm in the some project to rush with for reporting, so please help me to solve this issue i look forward to your corporation to help me solve this issue, thanks a lot in advance Thx Best Regards,

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• Why do I need a managed switch and which one should I buy?

  - by ascanio1

  I bought a 2nd router and I want both routers to have direct WAN access to the modem. One of the 2 routers directs VOIP traffic to a telephone line port. This VOIP service is provided by the cable carrier which also leases the modem & the router. The cable company technician told me that this VOIP line uses IPv6 addressing and therefore I must employ an IPv6 capable/compliant Giga Hub/Switch or my telephone line won't work anymore. Pls advise me (brand/model) an IPv6 compliant, 2 port, switch to purchase. Pls educate me: By reading this forum I thought that hubs broadcast traffic to all ports, regardless of which input/output is being used and so, theoretically, they have nothing to do with IP. Correct? Same story for unmanaged switches, where the only difference is that these latter devices route traffic only to those ports which are detected to be in use. Correct? I also understood that unmanaged switches route traffic simply by detecting hardware use and not by selecting specific IP traffic. Correct? Finally, there are managed switches which DO select traffic based on IP and, therefore, only these managed switches are involved with IPv6... Why would my cable company explicitly tell me, over and over, that I must use an IPv6 compliant switch? Why would they need a managed switch instead of an unmanaged one? Thanks in advance for helping me understand!

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• SWATCH - what am I doing wrong?

  - by Brian Dunbar

  What I want/need/desire is to log when a user logs into my FTP server. Problem: I can't make swatch work the way I should be able to. This data is logged to a file - but of course these logs are not kept very long. I can't keep the logs around forever, but I can extract data from then, analyze it, store results elsewhere. If there is a better way to do this than the following, I'm all ears. Swatch version 3.2.3 Perl 5.12 FTP: VSFTP OS (Test): OS X 10.6.8 OS (Production): Solaris From man I see I can pass contents to a command .. so I should be able to echo those values to file, do a sed/cut/uniq thing on them for stats. $ man swatch (snip) exec command Execute command. The command may contain variables which are substituted with fields from the matched line. A $N will be replaced by the Nth field in the line. A $0 or $* will be replaced by the entire line. Swatch file .swatchrc watchfor /OK LOGIN/ echo=red pipe "echo "0: $0 1:$1 2:$2 3:$3 4:$4 5:$5" >> /Users/bdunbar/dev/ftplog/output.txt" Launch with $ swatch -c /Users/bdunbar/.swatchrc --script-dir /Users/bdunbar/dev/ftplog -t /Users/bdunbar/dev/ftplog/vsftpd.log & Test echo "Mon July 9 03:11:07 2012 [pid 14938] [aetech] OK LOGIN: Client "206.209.255.227"" >> vsftpd.log Results - it's echoing to TTY. This is not needed or desired on the server, but it does tell me things are working. ftplog *** swatch version 3.2.3 (pid:25780) started at Mon Jul 9 15:23:33 CDT 2012 Mon July 9 03:11:07 2012 [pid 14938] [aetech] OK LOGIN: Client 206.209.255.227 Results - bad! I appear to not be sending the variables to text. $ tail -f output.txt 0: /Users/bdunbar/dev/ftplog/.swatch_script.25780 1: 2: 3: 4: 5:

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• Requests are making it to my app server, but not into node.js -- why?

  - by Zane Claes

  I detailed in this question on StackOverflow how some random requests are not making it from the client to my Node.js app server, resulting in a gateway timeout. In summary, identical requests are, at random, not even making it far enough to trigger a console.log() in my first line of express middleware. I need to narrow down the problem, though, to find out WHERE the traffic is being lost and it was suggested that I try a packet sniffer on my app servers. Here's my setup: 2x Load Balancers (m1.larges) 2x node.js servers (also m1.large) Here's what's interesting/unusual: the node.js servers started as PHP servers with an Apache stack and continue to serve PHP files for my domain (streamified.me). However, I use a little httpd.conf magic on the app servers so that requests to api.streamified.me get routed over port 8888 to the node.js server: RewriteCond %{HTTP_HOST} ^api.streamified.me RewriteRule ^(.*) http://localhost:8888$1 [P] So, the request hits the load balancer = goes to an app server = gets routed to port 8888 if it's intended for the API = gets handled by node.js So, in the same httpd.conf file, I turned on RewriteLogLevel 5 and then created a simple PHP+CURL script on my localhost to hit my api.streamified.me with a random URL (which should cause node.js to trigger a simple "not found" response) until it resulted in a Gateway timeout. Here, you can see that it has happened -- and the rewrite log shows that the request was definitely received by the app server and forwarded to port 8888... but it was never received by node.js (or, at least, the first line of code in the first line of middleware never gets it...) Image Link: http://i.stack.imgur.com/3OQxS.png

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• How to transform a csv to combine matching rows?

  - by Christian Wolf

  I have a CSV file with some transaction data. Let's say date, volume, price and direction (sell/buy). Additionally there is a ID for each transaction and on each closing transaction (the newer one) there is a reference to the corresponding transaction. Classical database referencing. Now I want to do some statistics and draw some plots. This could be done via Octave, LaTeX/TikZ, Gnuplot or whatever. To do this I need both buy and sell price in one row. My thought was to preprocess the CSV to get another CSV containing the needed information and then to do the statistics. In the end I'd like to have a solution based on scripts and not on a spreadsheet as data might change often (exported from online DB). My actual solution (see http://paste.ubuntu.com/6262822/ ) is a bash script that parses the CSV line by line and checks if there exists a corresponding transaction. If found, a new row is written to the destination CSV. If not a warning is printed. The bad news: For each row in the source file I have to read the whole file a few times. This causes long running times of 10sec for 300 lines. As the line number might rise soon (10k lines), this is not perfect. I am aware, that there are many shells to be opened in the script which might cause the performance problems. Now my questions: Is bash/awk/sed/.... a good way to do things? Should I first import all data into a "real" local database to use SQL? Is there an easy way to achieve the desired results?

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• Input field separator in awk

  - by Matthijs

  I have many large data files. The delimiter between the fields is a semicolon. However, I have found that there are semicolons in some of the fields, so I cannot simply use the semicolon as a field separator. The following example has 4 fields, but awk sees only 3, because the '1' in field 3 is stripped by the regex (which includes a '-' because some of the numerical data are negative): echo '"This";"is";1;"line of; data"' | awk -F'[0-9"-];[0-9"-]' '{print "No. of fields:\t"NF; print "Field 3:\t" $3}' No. of fields: 3 Field 3: ;"line of; data" Of course, echo '"This";"is";1;"line of; data"' | awk -F';' '{print "No. of fields:\t"NF}' No. of fields: 5 solves that problem, but counts the last field as two separate fields. Does anyone know a solution to this? Thanks! Matthijs

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• Is there a clean way to obtain exclusive access to a physical partition under Windows?

  - by zneak

  Hey guys, I'm trying, under Windows 7, to run a virtual machine with VMWare Player from an OS installed on a physical partition. However, when I boot the virtual machine, VMWare Player says that it couldn't access the physical drive for writing. This seems to be a generally acknowledged problem in the VMWare community, as Windows Vista introduced a compelling new security feature that makes it impossible to write to a raw drive without obtaining exclusive access to it first. I have googled the issue and found a few workarounds. However, the clean ones seem to only work on whole physical disks, and not on partitions. So I would be left with the dirty solution. In short, it meddles with the MBR to erase any trace of the partitions to use, makes Windows forget about them, then restores the MBR so we can launch the VM. I'm not sure I want to do that. Is there a way to let VMWare acquire exclusive access to the partition without requiring me to nuke it away? What I'd be looking for, I suppose, is a way to put just partitions offline instead of whole physical drives.

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• .htaccess modify rules and redirect if there's .php in the url

  - by Ron

  Hello everyone. I got the following code in my .htaccess: Options +FollowSymlinks RewriteBase /temp/test/ RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule ^about/(.*)/$ $1.php [L] RewriteRule ^(.*)/download/(.*)/(.*)/(.*)/downloadfile/$ file-download.php?product=$1&version=$2&os=$3&method=$4 [L] RewriteRule ^(.*)/download/(.*)/(.*)/(.*)/$ download-donate.php?product=$1&version=$2&os=$3&method=$4 [L] RewriteRule ^(.*)/download/(.*)/$ download.php?product=$1&version=$2 [L] RewriteRule ^newsletter-confirm/(.*)/$ newsletter-confirm.php?email=$1 [L] RewriteRule ^newsletter-remove/(.*)/$ newsletter-remove.php?email=$1 [L] RewriteRule ^(.*)/screenshots/$ screenshots.php?product=$1 [L] RewriteRule ^(.*)/(.*)/$ products.php?product=$1&page=$2 [L] RewriteRule ^schedule-manager/$ products.php?product=schedule-manager&page=view [L] RewriteRule ^visual-command-line/$ products.php?product=visual-command-line&page=view [L] RewriteRule ^windows-hider/$ products.php?product=windows-hider&page=view [L] RewriteRule ^(.*)/$ $1.php [L] RewriteRule ^products/$ products.php [L] everything work perfect. I would like to know how can I modify it so it will be less lines. I am pretty sure I can atleast remove 4-5 lines, but I dont know how. (merge the schedule-manager, visual-command-line and windows-hider, and some more). I know that the order of the rules is important, this order works - although I have no idea why, I just played with the rules until it worked. If you think that there'll be a bug with the following order please tell me where. Another thing - I would like to redirect for example www.myweb.com/products.php to www.myweb.com/products/ (I mean that the URL in the address bar will change). I dont know if the redirect can go along with my rewrite rules. Thank you.

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• What can be a reason for phpMyAdmin login to be not working (not at all, no reaction on submit)?

  - by Ivan

  When I open "http://localhost/phpmyadmin/", enter "root" as the user name and my MySQL root password and press go, then if I was using Firefox, I was getting offered to download index.php file (of a zero length), if I was using Opera 11, it said "Connection closed by remote server". Following recommendations I've removed all packages related to phpMyAdmin, PHP, MySQL and Apache and then reinstalled them step-by step (instead of just issuing apt-get install phpmyadmin and relying on the system to install the whole LAMP stack via dependencies as I've done before). The only change I've got was Firefox to stop offering to download index.php - now when I press Ok to submit my password, it just doesn't show any visible reaction at all. What may the reason be and how to fix it? I use up-to-date Xubuntu 11.04. Reinstalling the whole LAMP stack and phpMyAdmin did not help, neither did removing AppArmor. I've tried to use SQLBuddy instead, but there's exactly the same problem. So, I think, the problem is not in phpMyAdmin but in MySQL, Apache or something. MySQL seems to work if I use command line to access it. Apache & PHP seems to work also, as the login page of phpMyAdmin displays correctly.

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• Excel or Access: how to group several lines in a table and insert contents in columns? ("split column")

  - by Martin

  I have a table containing data of sold products (shown in the example on the left): Columns: Number of the order Product Name Attribute - specifies what is given in the following field "value", e. g. Customer Name or Product Variant Value - is the value of the Attribute Count - is the number of products of this variant sold in the order That means: Product B has 2 variants "c" and "d" Note that in Order 1 Product B was sold in Variant d only, because the letter "N" in field "D4" means "none". Note, that in OrdnerNo 3 Product B was sold only in Variant c, because for Variant d field "D9" is "N"!! This is confusing, but it is the structure of the original data (which I can not change). I need a way to convert the table on the left in a table like that on the right: one line for each product type Order Number Product Name Customer Name Count (number of products sold in this order) Variant - this is the problem, as it has to be filled with the So all rows with the same OrderNo and same product have to be grouped in to one, and I hope it is clear what I need. I tried to do it with Pivot Tables, but that fails, as the Count is always in each line, no matter if it has Value "N" or not and for the products without variants there is only one line for each order, however for products with variants there are several... So how could I create the right table with a VBA macro in MS Excel or maybe there is a trick in MS Access to do it directly or with an SQL query?

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