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• Piping the output of a program to Preview.app

  - by Abhay Buch

  I'm using an application (the dot program of the graphviz library) that generates a wide variety of file formats including PostScript and PDF. It can send the result to stdout or to a file. I'm currently sending it to a file and opening it with Preview. Is there any way to pipe the output and have it be read by Preview, so that I'd don't have to generate a file and have it lying around? This is going to be used by a number of people who won't know the internal structure of the generating script and I don't want to clutter their folders or complicate their lives. More generally, is there any way to take a program that sends its output to stdout and pass that output to an program that usually takes it's input from a file, without actually creating a file?

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• Easy to use JSON Web Service Hosts?

  - by Serguei Fedorov

  I saw this being used by someone in a college class once and cannot find anything that is analogous to it. I am not sure if this is the right place to ask about something like this, but hopefully I can get some direction. I want to write an app which uses web services that can obtain and push data back to the client apps. Right now I am gathering up the design and documentation of this app. Not having to code the web service myself would reduce development time by a lot; instead using an easy to setup web service that will be easy to setup and manage. Either XML based on JSON based is totally fine; though I would prefer JSON for its reduced overhead. Like I said I have seen this demonstrated before; you define the data structure to be stored and how it is treated. I cannot find the person who demonstrated this; hopefully maybe someone can suggest something? The service he used was free with a limited amount of requests allowed. EDIT: He was using an online service to do this not a script which is installed onto an existing web hosting account. Thank you!

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• cURL looking for CA in the wrong place

  - by andrewtweber

  On Redhat Linux, in a PHP script I am setting cURL options as such: curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, True); curl_setopt($ch, CURLOPT_CAINFO, '/home/andrew/share/cacert.pem'); Yet I am getting this exception when trying to send data (curl error: 77) error setting certificate verify locations: CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none Why is it looking for the CAfile in /etc/pki/tls/certs/ca-bundle.crt? I don't know where this folder is coming from as I don't set it anywhere. Shouldn't it be looking in the place I specified, /home/andrew/share/cacert.pem? I don't have write permission /etc/ so simply copying the file there is not an option. Am I missing some other curl option that I should be using? (This is on shared hosting - is it possible that it's disallowing me from setting a different path for the CAfile?)

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• System Restore Points

  - by Ross Lordon

  Currently I am investigating how to schedule an automatic initiation of a system restore point for all of the workstations in my office. It seems that Task Scheduler already has some nice defaults (screenshots below). Even the history for this task verifies that it is running successfully. However, when I go to Recovery in the Control Panel it only lists the System Restore Points one for every previous for only 3 weeks back even if I check the show more restore points box. Why don't the additional ones appear? Would there be a better way to implement a solution, like via group policy or a script? Is there any documentation on this online? I've been having a hard time tracking anything down except how to subvert group policy disabling this feature.

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• Mirroring MySQL server with diffrent configuration

  - by HTF

  I have to migrate MySQL server to a different data centre so I would like to create another MySQL slave server in new DC and then promote it to a master later on. I previously used LVM snapshots and Percona Xtrabackup for this purpose but this time I've optimized MySQL configuration file that prevents me from using these methods. Old server (backup): innodb_log_file_size = 256M innodb_log_files_in_group = 3 New server (restore): innodb_log_file_size = 512M innodb_log_files_in_group = 2 The Xtrabackup script and LVM snapshots copy the whole directory structure so the MySQL server won't start because there is a different size for InnoDB logs. Is there any solution to avoid a downtime in this case? I can't use mysqldumps as there is around 8000 databases so I would have to take the server down for a couple of hours. I was also thinking to use the old settings with Xtrabackup and then change it once the new server is promoted to a master - less downtime but I'm not sure if this will work? Thank you Regards

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• Monitor a log file on Linux and send each line to another program

  - by mlambie

  I run an apt-cacher-ng server on Ubuntu Linux which writes logs in the following format: 1299745593|O|149406|XXX.XXX.XXX.XXX|uburep/pool/main/t/tiff/libtiff4_3.9.2-2ubuntu0.4_amd64.deb 1299745593|O|10154976|XXX.XXX.XXX.XXX|uburep/pool/main/l/linux-firmware/linux-firmware_1.34.4_all.deb 1299748529|O|39368|XXX.XXX.XXX.XXX|uburep/pool/main/n/nagios-nrpe/nagios-nrpe-server_2.12-4ubuntu1_amd64.deb 1300155440|O|680100|XXX.XXX.XXX.XXX|uburep/pool/main/t/tzdata/tzdata_2011c-0ubuntu0.10.04_all.deb It shows the timestamp, direction (in or out), byte count, IP and filename. Every time a line is written to it, I'd like to also send that line to another program. I will have this program insert the line into a database so that I can crunch some statistics about how much bandwidth we're saving through operating a caching server. I do not want to cat the log file every X minutes (via cron) looking for new entries as it'd be somewhat computationally uneconomical. Instead I'd prefer to have a daemon monitor the log, and when a change is detected, each line is sent to my database-insertion script. Will swatch achieve this, or are there better options?

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• How can I run a job when the server load is low?

  - by jberryman

  I have a command that runs a disk snapshot (on EC2, freezing an XFS disk and running an EBS snapshot command), which is set to run on a regular schedule as a cron job. Ideally I would like to be able to have the command delayed for a period of time if the disk is being used heavily at the moment the task is scheduled to run. I'm afraid that using nice/ionice might not have the proper effect, as I would like the script to run with high priority while it is running (i.e. wait for a good time, then finish fast). Thanks.

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• HP Envy dv6t-7300: Disabled WiFi through button and can't enable it anymore

  - by Mateus B. Cassiano

  Well, I have a HP Envy dv6t-7300 laptop that came with a Ralink RT5390 WiFi card. Everything was working perfectly, and eventually I press the WiFi button in my keyboard to toggle the card on/off. Until today, all worked right: if the wifi was off (wifi LED amber) and I press the wifi button, after a few seconds the LED turn white and everything works. If I repeat the process, the wifi LED turn amber and the card get disabled, but now, I can't turn it on anymore. running sudo rfkill list all I get: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: yes So, I ran sudo rfkill unblock all but nothing changed. As a side note, if I run sudo ifconfig wlan0 up, the indicator LED gets white (indicating that the card was enabled), but Ubuntu still say that the card is blocked by hardware. Extra information: the card works without issues in windows and in Ubuntu installer (booting from a live CD). I'm using the card out-of-box, using the drivers already included in Ubuntu 12.10. The module rt2800pci is loaded and working fine, not blacklisted, etc, etc. The card and the button toggle worked flawlessly until today, when I toggled it off and can't turn it on anymore... The problem is back, but in a different manner: if I don't press the wifi key a few times during the grub loading, in the login screen the wifi button will be ambar (disabled), pressing it will toggle it white (enabled) or ambar (disabled) again, but ubuntu still says that the network card was disabled by hardware and doesn't connect... In other words, if I don't press the WiFi button a few times when Ubuntu is booting, it will be stuck with the "network card was disabled by hardware" message, even if the light is white (enabled). Any clue? Maybe a error in some startup script or config file?

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• Build a user's profile directory on creation in batch

  - by Moses

  I have a batch script that I use when I set up new Windows 7 PCs that creates a user based on a variable, creates a folder on their desktop, then shares it: @echo off SET /p unitnumber="Enter unit number: " net user unit%unitnumber% password /add /expire:never MD "C:/Users/unit%unitnumber%/Desktop/Accounting #%unitnumber%" runas /user:administrator "net share "Accounting#%unitnumber%"="C:/Users/unit%unitnumber%/Desktop/Accounting#%unitnumber"" I discovered that the share that is created is overwritten when the newly created user first logs on, because Windows creates builds their profile directory at that time. Is there any way to initiate a build of a user's profile directory in the batch file just after creating the it? The only thing that looks useful is the /homedir:pathname switch for the net user command, but I believe that option assumes the directory already exists. Other than that web research hasn't been fruitful. I'd be to use whatever to get this done as long as I can incorporate/launch it from the batch. Any suggestions?

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• how to remotely open an URL in Firefox in a specific profile?

  - by miernik

  I have several instances of Firefox with several different profiles running. Among them profiles with the names "software" and "test". I am trying to open an URL from a bash script to have it open in profile "test", like this: firefox -P "test" http://www.example.org/ However that opens it in profile "software" anyway. Any ideas? Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100308 Iceweasel/3.5.8 (like Firefox/3.5.8) No, it is not a permissions problem, all my profile directories are perfectly under my permissions: root@przehyba:~/.mozilla# ls -ld firefox/ drwx------ 13 miernik miernik 4096 Mar 11 09:15 firefox/ root@przehyba:~/.mozilla# ls -ld firefox/* drwxr-xr-x 9 miernik miernik 4096 Mar 12 11:29 firefox/info -rw-r--r-- 1 miernik miernik 560 Mar 11 09:15 firefox/profiles.ini drwxr-xr-x 10 miernik miernik 4096 Mar 16 11:51 firefox/software drwxr-xr-x 9 miernik miernik 4096 Mar 11 09:14 firefox/tech drwxr-xr-x 11 miernik miernik 4096 Mar 15 22:48 firefox/test root@przehyba:~/.mozilla#

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• How can I audit a Linux filesystem for files which have been changed or added within a specific time

  - by Bcos

  We are a website design/hosting company running several sites on a Linux server using Joomla 1.5.14 and recently someone was able exploit a vulnerability in the RW Cards component to write arbitrary files/modify existing files on our filesystem enabling them to do some nasty things to our customers sites. We have removed vulnerable modules from all sites but are still seeing some problems. We suspect that they still have some scripts installed and need a way to audit anything that has been changed or added in the last 10 days. Is there a command or script we can run to do this?

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• Knife leaves stray processes on my system

  - by Leons

  I'm seeing stray knife processes on my system. I have an automated ruby script that runs bundle exec knife bootstrap against various nodes. Most of the time the knife process completes and goes away, but sometimes it stays for days. I'm noticing it days later in ps aux I think it's related to the target node being down when knife runs. The chef server timeout is high, so the action completes eventually when the node goes back up, but I think knife may give up or hang somehow during the wait. Is there something I can do about the stray knife processes? Does knife have timeout settings separate from the chef server's timeout settings?

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• Migration a database from 32bit to 64bit

  - by Mike Dietrich

  Database migrations from an 32bit environment to an 64bit environment keeping the same platform architecture (e.g. moving an Oracle 10.2.0.5 database from MS Windows XP 32bit to MS Windows Server 2003 64bit) does not happen that often anymore. But still we see them getting done. And there are a few things to note when doing such a move. First of all the important question is:Will you upgrade your database as part of this move - Yes or No? If you say "Yes" then you are almost done with that topic as we will take care of that bitnes move during the upgrade. The only thing you have to take care is OLAP in case you are using OLAP Option with Analytic Workspaces (AW) by yourself. Those store data in Binary LOBs - and in order to move AWs from 32bit to 64bit you have to export your AWs prior to the move - and import them later on. People who don't use OLAP don't have to take care on this. But if you say "No" (meaning: no upgrade actions involved - you keep your database version) then you have to make sure to invalidate all packages and stored code in the database before you shutdown your database in the 32bit environment and prior to moving it over. And the same rule as above for OLAP applies once you use the OLAP Option. In the source environment: startup upgrade;    -- [or startup migrate; -- for Oracle 9i] @?/rdbms/admin/utlirp.sqlshutdown immediate In the destination environment: startup upgrade @?/olap/admin/xumuts.plb --Only if OLAP Option is installed@?/rdbms/admin/utlrp.sql The script utlirp.sql will invalidate all packages and stored code, utlrp.sql will recompile - and xumuts.plb will rebuild the OLAP Analytic Workspaces in case you have the OLAP Option installed.

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• How to get filename of job in cups?

  - by Grook

  I have printed a couple of files and lpstat shows that they are completed. But the output is something like this: # lpstat -W completed -l Canon-1 root 1086464 Sat May 21 22:47:03 2011 Alerts: job-canceled-by-user queued for Canon Canon-2 root 337920 Mon May 23 20:18:02 2011 Alerts: job-canceled-by-user queued for Canon CanonWin-3 root 17408 Mon May 23 20:29:40 2011 Alerts: job-completed-successfully queued for CanonWin` How can i get names of files which has been printed? P.S. Is there is any bash-script which allows me to get names of all files which has been printed?

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• X-notifier doesn't work in Chromium Browser

  - by cipricus

  It just keeps checking in vain. Also cannot import or export data, but get this error I use the latest versions of both in Lubuntu 12.04. In Google Chrome it works. What could it be the problem? Edit - following vasa1's comment - running sudo aa-status i get apparmor module is loaded. 16 profiles are loaded. 16 profiles are in enforce mode. /sbin/dhclient /usr/bin/evince /usr/bin/evince-previewer /usr/bin/evince-previewer//launchpad_integration /usr/bin/evince-previewer//sanitized_helper /usr/bin/evince-thumbnailer /usr/bin/evince-thumbnailer//sanitized_helper /usr/bin/evince//launchpad_integration /usr/bin/evince//sanitized_helper /usr/lib/NetworkManager/nm-dhcp-client.action /usr/lib/connman/scripts/dhclient-script /usr/lib/cups/backend/cups-pdf /usr/lib/lightdm/lightdm/lightdm-guest-session-wrapper /usr/sbin/cupsd /usr/sbin/ntpd /usr/sbin/tcpdump 0 profiles are in complain mode. 3 processes have profiles defined. 3 processes are in enforce mode. /sbin/dhclient (1562) /usr/sbin/cupsd (916) /usr/sbin/ntpd (1695) 0 processes are in complain mode. 0 processes are unconfined but have a profile defined.

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• /proc/pid/environ missing variables

  - by Josh Arenberg

  google is giving no love on this one today, so I turn to the experts... I'm currently hacking together a script that relies on the /proc/pid/environ feature in Linux (RHEL 4) to check for a particular environment variable. Trouble is, it seems certain environment variables aren't showing up in there for some reason. Example: create some test vars: $ export T_1=testval TEST_1=testval T=testval TESTING_LONGEST=testval open a subshell: $bash $ cat /proc/self/environ|tr "\0" "\n"|grep testval TESTVARIABLE_LONGEST=testval T=testval hmm... where did T_1 and TEST_1 go?? what rules govern this strange universe? Thanks in advance, Josh

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• Check a list of passwords strength

  - by user144705

  Is there any way to check a list of passwords whether they strong or not? I have a list of passwords, around 2000, and want to check them against this policy Password must contain a minimum of eight (8) characters Password must contain at least one letter Password must contain at least one number Password must contain at least one punctuation character And count how many compliant with that policy before we save them. Is there any tool, script or maybe rules in excel to do this instead of doing it manually? Could you please help me?

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• Misbehaving Network Printers - options?

  - by Dan Kelly

  We are having some issue with printers on our network. We have 3 floors, 2 printers per floor (A3 & A4) all connected to the same Print Server. The issue is that the same printer may not behave the same on two different, seemingly identical desktops. The commonest place this is seen on our bulk print script in AutoCAD - occasionally drawings may print Landscape on Portrait paper, despite drawings always being Landscape... Does any one have any suggestions on what we can check / try? The current line of attack is to setup a new Print Server, with the HP universal print driver rather than the device specific drivers, and replace printers using exactly the same method on all desktops. Sound good?

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• Need a solution to stop students from rotating screen on laptops with intel graphics

  - by testguy

  We have some students who have figured out how to rotate the screen using either the hotkey combination or right click context menu. It's easy to fix but it's time consuming because no matter how many times I tell people how to fix it there's always someone that will come up to me. Now I need two things. First, is there a way to disable screen rotation? Second, I need a script to reset the screen resolution to normal on logon and logoff. The solutions need to be able to be deployed from a Win2003 server to WinXP clients. I have way too many computers to go through by hand to uncheck enable hot keys on the intel control panel.

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• Ubuntu can't install an older version of a package

  - by Trevor Newhook

  When I try to do an apt-get install, I keep getting an error: Depends: libgtk-3-common (= 3.4.1-0ubuntu1) but 3.4.2-0ubuntu0.4 is to be installed when I run sudo apt-get -f install, I get several dpkg: warning: files list file for package 'XXX' missing, assuming package has no files currently installed. then Preparing to replace libgtk-3-bin 3.4.1-0ubuntu1 (using .../libgtk-3-bin_3.4.2-0ubuntu0.4_i386.deb) ... Adding 'diversion of /usr/sbin/update-icon-caches to /usr/sbin/update-icon-caches.gtk2 by libgtk-3-bin' dpkg-divert: error: rename involves overwriting `/usr/sbin/update-icon-caches.gtk2' with different file `/usr/sbin/update-icon-caches', not allowed dpkg: error processing /var/cache/apt/archives/libgtk-3-bin_3.4.2-0ubuntu0.4_i386.deb (--unpack): subprocess new pre-installation script returned error exit status 2 Errors were encountered while processing: /var/cache/apt/archives/libgtk-3-bin_3.4.2-0ubuntu0.4_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) I'm not sure why it's complaining about a newer version of a package, but any help would be appreciated

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• How do I elevate privileges when running appcmd from a nant task?

  - by Rune

  We are using a Windows 7 box as build server. As part of our continuous integration process I would like to stop and start an IIS 7 website. I have tried doing this from the command line using appcmd: appcmd start site "my website" However, this only works if I start the console window by choosing "Run as Administrator", so it won't work out-of-the-box from NAnt etc. How do I script appcmd to be run with elevated privileges (or am I going about this in the wrong way)? Thank you.

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• Is it possible to use a VB master page to cover an entirely separate directory written in C#?

  - by Jason Weber

  I have a company website written in vb.net. There are 5 master pages. I recently began utilizing a forum application, also asp.net 4.0, but this one is written in C#. My forum directory is domain.com/knowledgebase/. Is there any possible way to take one of my vb.net master pages and somehow integrate into the /knowledgebase/ directory? Here's what's currently This is what's in the top of every page in my site: <%@ Page Title="USS Vision Inc." Language="VB" MasterPageFile="~/homepage.master" AutoEventWireup="false" CodeFile="default.aspx.vb" Inherits="_default" culture="auto" meta:resourcekey="PageResource1" uiculture="auto" Debug="true" %> This is what's in my /knowledgebase/ directory: <%@ Page Language="C#" AutoEventWireup="true" ValidateRequest="false" Inherits="YAF.ForumPageBase" culture="auto" uiculture="auto" %> <%@ Register TagPrefix="YAF" Assembly="YAF" Namespace="YAF" %> <script runat="server"> Is it somehow possible to use, for instance, homepage.master in the /knowledgebase/ directory? If so, how would I accomplish this? Thanks for any guidance anybody can offer!

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• How to start a service at boot time in ubuntu 12.04, run as a different user?

  - by Alex

  I have a server ClueReleaseManager which I have installed on a Ubuntu 12.04 system from a separate user (named pypi), and I want to be able to start this server at startup. I already have tried to create a simple bash script with some commands (login as user pypi, use a virtual python environment, start the server), but this does not work properly. Either the terminal crashes or when I try to ask the status of the service it is started and I am logged in as user pypi ...? So, here the question: What are the steps to take to make sure the ClueReleaseManager service properly starts up on boot time, and which I can control (start/stop/..) during runtime, while the service is running from a user pypi? Additional information and constraints: I want to do this as simple as possible Without any other packages/programs to be installed I am not familiar with the Ubuntu 12.04 init structure All the information I found on the web is very sparse, confusing, incorrect or does not apply to my case of running a service as a different user from root.

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• Entity system in Lua, communication with C++ and level editor. Need advice.

  - by Notbad

  Hi!, I know this is a really difficult subject. I have been reading a lot this days about Entity systems, etc... And now I'm ready to ask some questions (if you don't mind answering them) because I'm really messed. First of all, I have a 2D basic editor written in Qt, and I'm in the process of adding entitiy edition. I want the editor to be able to receive RTTI information from entities to change properties, create some logic being able to link published events to published actions (Ex:A level activate event throws a door open action), etc... Because all of this I guess my entity system should be written in scripting, in my case Lua. In the other hand I want to use a component based design for my entities, and here starts my questions: 1) Should I define my componentes en C++? If I do this en C++ won't I loose all the RTTI information I want for my editor?. In the other hand, I use box2d for physics, if I define all my components in script won't it be a lot of work to expose third party libs to lua? 2) Where should I place the messa system for my game engine? Lua? C++?. I'm tempted to just have C++ object to behave as servers, offering services to lua business logic. Things like physics system, rendering system, input system, World class, etc... And for all the other things, lua. Creation/Composition of entities based on components, game logic, etc... Could anyone give any insight on how to accomplish this? And what aproach is better?. Thanks in advance, HexDump.

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• tail -f updates slowly

  - by Cliff

  I'm not sure why, but on my Macbook Pro running lion I get slow updates when I issue "tail -f" on a log file that is being written to. I used to use this command all the time at my last company but that was typically on Linux machines. The only thing I can think of that would possibly slow the updates are buffering of output and/or maybe a different update interval on a Mac vs. Linux. I've tried with several commands all which write to stout relatively quickly but give slow updates to the tail command. Any ideas? Update I am merely running a python script with a bunch of prints in it and redirecting to a file vi " my output.log". I expect to see updates near real time but that doesn't seem to be the case.

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