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  • Insert escaped characters in seq command separator

    - by dhekir
    How do I insert a string containing escaped characters (\n, \t, etc) as separator for the seq command? The standard format includes a newline character: $ seq 3 1 2 3 But if I try to add something plus a newline, the backslash is escaped and a literal "\n" is used instead: $ seq -s "$\n" 3 1\n2\n3 The same happens using simple quotes, no quotes, or other escaped characters: $ seq -s "\t" 3 1\t2\t3 $ seq -s \t 3 1t2t3 This is not the standard behavior for commands such as echo, so I'm a bit confused here... Edit: Ideally, I'd like a somewhat portable solution (that works in tsch as well as bash, for instance), and without resorting to Perl or other languages.

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  • Embedded Tomcat Cluster

    - by ThreaT
    Can someone please explain with an example how an Embedded Tomcat Cluster works. Would a load balancer be necessary? Since we're using embedded tomcat, how would two separate jar files (each a standalone web application with their own embedded tomcat instance) know where eachother are and let eachother know their status, etc? Here is the code I have so far which is just a regular embedded tomcat without any clustering: import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.io.Writer; public class Main { public static void main(String[] args) throws LifecycleException, InterruptedException, ServletException { Tomcat tomcat = new Tomcat(); tomcat.setPort(8080); Context ctx = tomcat.addContext("/", new File(".").getAbsolutePath()); Tomcat.addServlet(ctx, "hello", new HttpServlet() { protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Writer w = resp.getWriter(); w.write("Hello, World!"); w.flush(); } }); ctx.addServletMapping("/*", "hello"); tomcat.start(); tomcat.getServer().await(); } } Source: java dzone

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  • Emacs eshell over SSH not obeying key commands or elisp

    - by Brad Wright
    When SSHing to a remote server Eshell doesn't behave very well, e.g: M-x eshell ssh server <tab> *inserts literal tab instead of trying to complete* Hitting <tab>, for instance, inserts a literal tab. Is there no way to get tab completion, lisp interaction (like find-file blah) etc. over SSH? All the documentation I've read says Eshell is "TRAMP-aware", which I assume meant it could deal with this. Am I just wrong in my assumption that it would work over SSH, or is something broken? This is on Emacs 24.0.94 pretest.

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  • How do I access my public DNS on Amazon's EC2

    - by Spencer Carnage
    I'm working with Amazon's EC2 for the first time. I went through all of the steps at http://docs.amazonwebservices.com/AWSEC2/latest/GettingStartedGuide/ and now I'm trying to access the public DNS through a web browser. I get nothing. I don't even know if I'm supposed to get anything, really. I just want to see something that indicates that my instance is accessible from the web for development's sake. I'm completely new at this and I can't find a simple answer to this anywhere to save my life. Any help would be MUCH appreciated. Thanks!

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  • Windows CE Remote Kernel Tracker - gathering data in one (more) file during a log period of time

    - by Nic
    I'm using the "Windows CE Kernel Tracker" tool to gather data from my embedded device. This is working fine for short period of time. It seems that the tool is getting data in memory and not on disk. I'm wondering if there is a way to take the data from the device and log it in one or more file on my development computer. This could be useful for long time test period : for instance, one night or one entire day. Any ideas? p.s. I don't want to log on to the device, I want to log on my development PC.

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  • Social Media Aggregator, Global Update via Powershell

    - by deanjmiller
    Does anyone know of a way to interface with a Social Media Aggregator using Powershell. For Instance, I would like to update my global status on digsby using Powershell. Digsby would then fan the message out to Facebook, Myspace, Twitter, Etc.. I am open to using any Social Media Aggregator that can do this.. Digsby, Seesmic, Ping.fm TweetDeek, etc.. If any of these programs have a com interface or something like it I'm sure who ever implements this first will have a large gain in users.

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  • How do I lower idle cpu usage in ubuntu linux? Gnome or KDE Variants

    - by Jasen
    My question comes from a kde desktop currently, but it also happens with the gnome instance. When just sitting there, with only the cpu monitor widget running. no open windows, no background processes other than the desktop, my cpu is at ~20%. I wanna know how to fix this, and possibly get better performance out of it. When running my windows side, the cpu will sit at zero, and i generally load new programs about 400ms faster. With windows 7 being as slow as it is, this is not acceptable. and the widget is only set to check every 500ms, so im almost completely sure its not the widget. My system is a Gateway nv 53 amd 2.0 ghz turion with 4 gb of installed ram, and 500 gb hd. both linux and windows are 64 bit. average ram use on either system is about 1.4 gb for just the os

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  • Is there a way to control two instantiated systemd services as a single unit?

    - by rascalking
    I've got a couple python web services I'm trying to run on a Fedora 15 box. They're being run by paster, and the only difference in starting them is the config file they read. This seems like a good fit for systemd's instantiated services, but I'd like to be able to control them as a single unit. A systemd target that requires both services seems like the way to approach that. Starting the target does start both services, but stopping the target leaves them running. Here's the service file: [Unit] Description=AUI Instance on Port %i After=syslog.target [Service] WorkingDirectory=/usr/local/share/aui ExecStart=/opt/cogo/bin/paster serve --log-file=/var/log/aui/%i deploy-%i.ini Restart=always RestartSec=2 User=aui Group=aui [Install] WantedBy=multi-user.target And here's the target file: [Unit] Description=AUI [email protected] [email protected] After=syslog.target [Install] WantedBy=multi-user.target Is this kind of grouping even possible with systemd?

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  • Alternatives to type casting in your domain

    - by Mr Happy
    In my Domain I have an entity Activity which has a list of ITasks. Each implementation of this task has it's own properties beside the implementation of ITask itself. Now each operation of the Activity entity (e.g. Execute()) only needs to loop over this list and call an ITask method (e.g. ExecuteTask()). Where I'm having trouble is when a specific tasks' properties need to be updated. How do I get an instance of that task? The options I see are: Get the Activity by Id and cast the task I need. This'll either sprinkle my code with: Tasks.OfType<SpecificTask>().Single(t => t.Id == taskId) or Tasks.Single(t => t.Id == taskId) as SpecificTask Make each task unique in the whole system (make each task an entity), and create a new repository for each ITask implementation I don't like either option, the first because I don't like casting: I'm using NHibernate and I'm sure this'll come back and bite me when I start using Lazy Loading (NHibernate currently uses proxies to implement this). I don't like the second option because there are/will be dozens of different kind of tasks. Which would mean I'd have to create as many repositories. Am I missing a third option here? Or are any of my objections to the two options not justified? How have you solved this problem in the past?

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  • Sharepoint 2007 Event ID 6482

    - by Dave M
    Our two server SharePoint 2007 SP2 farm has an issue. Event ID 6482 appears in the Application log of the Web front end many times a day. Often many time a minute. The full error is from Office SharePoint Server Event Type: Error Event Source: Office SharePoint Server Event Category: Office Server Shared Services Event ID: 6482 Date: 11/12/2009 Time: 3:05:22 PM User: N/A Computer: XXXXXX Description: Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (36a9b7ef-59aa-4f94-8887-8bf7b56f2f91). Reason: Error during encryption or decryption. System error code 0. Techinal Support Details: System.ArgumentException: Error during encryption or decryption. System error code 0. at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.SynchronizeDefaultContentSource(IDictionary applications) at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize() at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. The SharePoint site appears to be functioning normally and Search returns expected results. Any suggestions would be appreciated

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  • VLC RTP Streaming in FC12

    - by Matt D
    I'm trying to get VLC to work streaming RTP audio/video over my office network. The goal is multicast a/v streaming. In all test cases, we are streaming from VLC to VLC. I am able to stream from Windows to Windows, and from Fedora to Windows, but not from Windows to Fedora. Additionally, I am unable to receive a LOCAL stream from one instance of VLC to another, within Fedora. I don't see any reason why this would be. The buffer indicator (where the elapsed/total time is normally displayed) never shows any connectivity, so it would appear to be a network problem, but since I am able to stream from Fedora to Windows (same IP, same port) I thought it would be something else. Does anyone know of a solution to this issue?

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  • How can I read a portion of one Minecraft world file and write it into another?

    - by RapierMother
    I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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  • Tracking down Data Execution

    - by Agnel Kurian
    I have some malware infecting one of our machines at home. It first showed up as winulty.exe. After investigating, I am of the opinion that winulty.exe itself is an uninfected file but is being modified after it has loaded into memory. Turning on Data Execution Prevention for all processes and services has confirmed this to be true. How do I track down the process responsible for this? I've used File Monitor from sysinternals.com to monitor winulty.exe and see this being accessed by the svchost.exe instance hosting most of the system services and also by dfrgntfs.exe. How do I know which service or which DLL has been infected?

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  • Player & Level class structure in 2D python console game?

    - by Markus Meskanen
    I'm trying to create a 2D console game, where I have a player who can freely move around in a level (~map, but map is a reserved keyword) and interfere with other objects. Levels construct out of multiple Blocks, such as player(s), rocks, etc. Here's the Block class: class Block(object): def __init__(self, x=0, y=0, char=' ', solid=False): self.x = x self.y = y self.char = char self.solid = solid As you see, each block has a position (x, y) and a character to represent the block when it's printed. Each block also has a solid attribute, defining whether it can overlap with other solids or not. (Two solid blocks cannot overlap) I've now created few subclasses from Block (Rock might be useless for now) class Rock(Block): def __init__(self, x=0, y=0): super(Rock, self).__init__(x, y, 'x', True) class Player(Block): def __init__(self, x=0, y=0): super(Player, self).__init__(x, y, 'i', True) def move_left(self, x=1): ... # How do I make sure Player wont overlap with rocks? self.x -= x And here's the Level class: class Level(object): def __init__(self, name='', blocks=None): self.name = name self.blocks = blocks or [] Only way I can think of is to store a Player instance into Level's attributes (self.player=Player(), or so) and then give Level a method: def player_move_left(self): for block in self.blocks: if block.x == self.player.x - 1 and block.solid: return False But this doesn't really make any sense, why have a Player class if it can't even be moved without Level? Imo. player should be moved by a method inside Player. Am I wrong at something here, if not, how could I implement such behavior?

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  • Dealing with Fine-Grained Cache Entries in Coherence

    - by jpurdy
    On occasion we have seen significant memory overhead when using very small cache entries. Consider the case where there is a small key (say a synthetic key stored in a long) and a small value (perhaps a number or short string). With most backing maps, each cache entry will require an instance of Map.Entry, and in the case of a LocalCache backing map (used for expiry and eviction), there is additional metadata stored (such as last access time). Given the size of this data (usually a few dozen bytes) and the granularity of Java memory allocation (often a minimum of 32 bytes per object, depending on the specific JVM implementation), it is easily possible to end up with the case where the cache entry appears to be a couple dozen bytes but ends up occupying several hundred bytes of actual heap, resulting in anywhere from a 5x to 10x increase in stated memory requirements. In most cases, this increase applies to only a few small NamedCaches, and is inconsequential -- but in some cases it might apply to one or more very large NamedCaches, in which case it may dominate memory sizing calculations. Ultimately, the requirement is to avoid the per-entry overhead, which can be done either at the application level by grouping multiple logical entries into single cache entries, or at the backing map level, again by combining multiple entries into a smaller number of larger heap objects. At the application level, it may be possible to combine objects based on parent-child or sibling relationships (basically the same requirements that would apply to using partition affinity). If there is no natural relationship, it may still be possible to combine objects, effectively using a Coherence NamedCache as a "map of maps". This forces the application to first find a collection of objects (by performing a partial hash) and then to look within that collection for the desired object. This is most naturally implemented as a collection of entry processors to avoid pulling unnecessary data back to the client (and also to encapsulate that logic within a service layer). At the backing map level, the NIO storage option keeps keys on heap, and so has limited benefit for this situation. The Elastic Data features of Coherence naturally combine entries into larger heap objects, with the caveat that only data -- and not indexes -- can be stored in Elastic Data.

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  • login as rsh in rhel 6 without entering password

    - by cartmancakes
    I need to be able to login to a RHEL 6 server using rsh (please don't flame me about security, it's irrelevant in this particular instance) as root without having to enter a password. My procedure for setting this up works great in RHEL 5.x, but does not work in RHEL 6. I suspect this has something to do with PAM, but I'm inexperienced with how to use PAM. Can someone help me with this? /etc/pam.d/rsh auth required pam_rhosts.so auth required pam_nologin.so account include common-account password include common-password session required pam_loginuid.so session include common-session /etc/pam.d/rlogin auth required pam_nologin.so auth [user_unknown=ignore success=ok ignore=ignore auth_err=die default=bad] pam_securetty.so auth sufficient pam_rhosts.so auth include common-auth auth required pam_mail.so account include common-account password include common-password session required pam_loginuid.so session include common-session Thanks!

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  • Xen and Ubuntu?

    - by wag2639
    How does one properly approach having Ubuntu servers on a Xen hypervisor? I don't have any experience with RAID or Xen other than from a theoretical level. Additional requirements: Use with mdadm Software RAID 5 (can be on separate disks) that multiple instances with access Paravirtualized Ubuntu Server guests instances Possible ideas for now: Ubuntu host (dom0) with ubuntu-xen-server package (this purportedly isn't supported) dom0 host will "own" RAID 5 partition More Ubuntu servers as guests Citrix XenServer bare-metal host XenServer will own RAID Citrix XenServer bare-metal host Ubuntu guest instance creates and owns RAID Questions and concerns: Can Ubuntu be used as a dom0 Xen host? Can XenServer install packages such as mdadm and create a partition? Can multiple guest access (R + W) to the same data partition (RAID)? Note: since it may have a bearing on support, I'm referring to Ubuntu Server 10.04

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  • Architectural approaches to creating a game menu/shell overlay on PC/Linux?

    - by Ghopper21
    I'm am working on a collection of games for a custom digital tabletop installation (similar to Microsoft Surface tables). Each game will be an individual executable that runs full-screen. In addition, there needs to be a menu/shell overlay program running simultaneously. The menu/shell will allow users to pause games, switch to other games, check their game history, etc. Some key requirements of the shell: it intercepts all user input (mainly multitouch) first before passing it on to the currently running game (so that it can, for instance, know to pop-up at a "pause" command); can reveal on arbitrary portions of the screen, with the currently running (but presumably paused) game still showing underneath, ideally with its shape/size being dynamic, to allow for creation of an animated in/out drawer effect over the game. I'm currently looking into different architectural approaches to this problem, including Fraps and DirectX overlays, but I'm sure I'm missing some ways to think about this. What are the main approaches I should be considering? (Note the table is currently being run by Windows PC, but it could potentially be a Linux box instead.)

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  • Windows Server 2003 guest on Xen frequently stops responding

    - by smokris
    I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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  • Ubuntu nasty error: The panel encountered a problem while loading xxxApplet

    - by Phuong Nguyen
    I have install ubuntu & GNOME (say, with minimum possible number of packages). I can login and do anything as I want. However, there is a nasty thing: Whenever I loggin in, I see this message: Error The panel encountered a problem while loading "OAFIID:GNOME_FastUserSwitchApplet" Do you want to delete the applet from your configuration [Don't Delete] [Delete] If I press [Delete] then the error won't be shown anymore. However, for every new created account, the message shown again (use created using sudo adduser user_name). Since I clone this OS into several virtual instance, and create new account on these instances. I wonder if there is a way to configure my ubuntu so that new created user don't have to see this annoy message? Thanks

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  • Serve mirrored (static) web-page with original headers

    - by aioobe
    I have a dynamic webpage which I want to create a "frozen" copy of. Typically I would do something like wget -m http://example.com, and then put the files in the document root of the web-server. This site however has some dynamic content, including dynamically generated images, for instance http://example.com/company/123/logo This means that in order to mirror the page, I need to Save whatever headers the server currently serves for each URL. This can be done using the wget option --save-headers. Serve the static pages and serve the proper headers for each file. (This I have no idea of how to do.) What is the best way to solve this? Any suggestions are welcome.

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  • Are there ways to write php/python code to run as hooks in the Apache Request Processing pipeline?

    - by SB
    Does anybody know of any modules that provide the functionality to write python or PHP code to run as hooks in the Apache request processing pipeline? For instance, mod_perl lets me write PerlModules, which can contain handlers for the header parsing phase, content delivery, and even filters. I would like to do something similar in other scripting languages. I could write it in C, but the goal is to deploy a module that would work across a number of systems. If I deliver it as binary in C, then it would require 64/32-bit versions and some other issues. With perl, I can just require certain modules installed and mod_perl2.

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  • MMS gets hostname from uname and can't connect to it

    - by Adam Monsen
    I'm trying to get 10gen's MongoDB Monitoring Service monitoring my 3-node replica set. The replica set running in an AWS VPC. Each node runs on a different [virtual] machine. Assume their IPs are 192.168.1.1 (primary or secondary), 192.168.1.2 (primary or secondary), 192.168.1.3 (arbiter). From a quick look at the source, MMS appears to get the hostname of the machine it is running on like so: platform.uname()[1] For my VPC EC2 instance, this returns something like ip-192-168-1-1 MMS then tries to connect to this hostname, which does not resolve. I'd rather just use IP addresses (since they're always static), but it seems like the hardcoded use of platform.uname()[1] in mmsAgent.py precludes that. So, what's an elegant way out of this? Hack /etc/hosts? I'm not setting up a DNS server just for this. Maybe I'm just misunderstanding how to configure MMS.

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

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

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  • Web Crawler for Learnign Topics on Wikipedia

    - by Chris Okyen
    When I want to learn a vast topic on wikipedia, I don't know where to start. For instance say I want to learn about Binary Stars, I then have to know other things linked on that pages and linked pages on all the linked pages and so on for the specified number of levels. I want to write a web crawler like HTTracker or something similiar, that will display a heiarchy of the links on a certain page and the links on those linked pages.I wish to use as much prewritten code as possible. Here is an example: Pretending we are bending the rules by grabing links from only the first sentence of each pages The example archives and "processes" two levels deep The page is Ternary operation The First Level In mathematics a ternary operation is an N-ary operation The Second Level Under Mathmatics: Mathematics (from Greek µ???µa máthema, “knowledge, study, learning”) is the abstract study of topics encompassing quantity, structure, space, change and others; it has no generally accepted definition. Under N-ary In logic,mathematics, and computer science, the arity i/'ær?ti/ of a function or operation is the number of arguments or operands that the function takes Under Operation In its simplest meaning in mathematics and logic, an operation is an action or procedure which produces a new value from one or more input values ------------------------------------------------------------------------- I need some way to determine what oder to approach all these wiki pages to learn the concept ( in this case ternary operations )... Following along with this exmpakle, one way to show the path to read would a printout flowout like so: This shows that the first sentence of the Mathematics page doesn't link to the first sentence of pages linked on ternary page two levels deep. (Please tell me how I should explain this ) --- In otherwords, the child node of the top pages first sentence, ternary_operation, does not have any child nodes that reference the children of the top pages other children nodes- N-ary and operation. Thus it is safe to read this first. Since N-ary has a link to operations we shoudl read the operation page second and finally read the N-ary page last. Again, I wish to use as much prewritten code as possible, and was wondering what language to use and what would be the simpliest way to go about doing this if there isn't already somethign out there? Thank You!

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