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• background process outputs to the console

  - by broiyan

  Suppose test.sh is a bash script that is empty or contains only exit 0. When the script is backgrounded, what is the significance of the 1 and 16320 printed to the console? b@sam:~/Documents/bashscripts$ ./test.sh & [1] 16320 b@sam:~/Documents/bashscripts$ [1]+ Done ./test.sh b@sam:~/Documents/bashscripts$ Then if user hits ENTER at the command prompt, as illustrated above, another line appears and it shows this [1]+ Done ./test.sh What is the significance of the 1 digit and the + symbol?

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• Ping with explicit next-hop selection (aka Monitoring multiple default gateways)

  - by Michuelnik

  I have a linux (debian) router with two internet connections (A) and (B). (A) is preferred, (B) is fallback. I want to monitor the internet connection (and not only the availability of the gateways!) and change the default route appropriately. If (A) is not providing internet, switch to (B) If (A) is providing internet again, switch back to (A). Only problem I have is in case (2). My routing table points towards a working internet so I cannot easily detect whether internet is working over link (A) again. I am search for a ping or traceroute (or other diagnosis-tool) which can select the next-hop explicitly. ping -r looks promising, but can only ping a host on the lan. (It only has to write another destination address in the packet, damnit!) traceroute -g gateway looks even more promising and nearly does what I want - but sets source routing options which my next-hops deny. (Not within my administrative boundary...) I just want a $ping, that can: select a source interface (and address) select a next-hop on that interface ping any arbitrary ip address I could do evil trickery with policy-based routing but that would have production impact for all users. I would like to see a side-effect-free solution....

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• Java Community Process Transparency

  - by Tori Wieldt

  As part of the openness and transparency rules the London Java Community (LJC) and SouJava worked for under JSR-348, the JCP Executive Committee now has a public discussion list where anyone in the community can voice their questions, comments and concerns!Go to http://java.net/projects/jcp-ec/lists to subscribe. Please note that you need to have a java.net account before you can subscribe to the mailing list. "Joining" the project won't get you subscribed to the list.   Cracks in the Ivory Tower - Courtesy Devoxx 2011

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• Monitoring web sites accessed thru wireless connection

  - by Anand

  Hi, I have shared my internet connection to my neighbour using wireless network. Now I want to know what web sites he/she is accessing thru my internet connection. Please provide me list of free softwares that we can use to do this.

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• Interviewing Process (using blank paper etc)

  - by MJH

  I am curious to know why do companies hand you a blank paper and ask you to write code? This confuses me, because these days intellisense, google, stackoverflow etc are common sources to look up syntax and / or IDE gives you a colored indicator if your syntax is wrong. I usually get stressed out during these situations. I am curious to know opinions of other developers. I am posting this on this forum, hoping to get helpful feedback from other experienced developers.

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• Windows webserver monitor and notifier service

  - by WestDiscGolf

  I'm looking for a software tool/service, preferably opensource/free, which will run on a Windows 2003 r3 standard server which will monitor bandwidth usage of all the websites it's hosting (a break down by site would be very useful) and also send out notifications if IIS or another service (as defined) stops responding. A web interface to see the bandwidth usage and other details would be very useful. I've personally got a vps which does this kinda of monitoring but I believe this is more linked into the host itself. Does anyone have any pointers? All help is appriciated. Cheers

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• "Fatal Error" message during boot process

  - by Denja

  I'm running Ubuntu 10.10 with ATI proprietary FGLRX graphic drivers When I boot, I can see this very quick message appearing; I don't have time to read it: **Fatal Error ..................................**(&@something i cant read) I searched through the log file in /var/log/ in order to find what is wrong and I did find something in the /var/log/Xorg.1.log: 21:31:08 [ 15.734] (--) using VT number 1 [ 204.647] Fatal server error: [ 204.647] xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call [ 204.647] [ 204.647] Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 204.647] Please also check the log file at "/var/log/Xorg.1.log" for additional information. [ 204.647] But this is already Xorg.1.log. And there is a Xorg.0.log also & Xorg.0.log.old but it doesnt have any error in it. My system seems to work properly and it seems its not affected by this But how do I correct this message? Any suggestions?

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• Bandwidth monitoring with iptables for non-router machine

  - by user1591276

  I came across this tutorial here that describes how to monitor bandwidth using iptables. I wanted to adapt it for a non-router machine, so I want to know how much data is going in/coming out and not passing through. Here are the rules I added: iptables -N ETH0_IN iptables -N ETH0_OUT iptables -I INPUT -i eth0 -j ETH0_IN iptables -I OUTPUT -o eth0 -j ETH0_OUT And here is a sample of the output: user@host:/tmp$ sudo iptables -x -vL -n Chain INPUT (policy ACCEPT 1549 packets, 225723 bytes) pkts bytes target prot opt in out source destination 199 54168 ETH0_IN all -- eth0 * 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 1417 packets, 178128 bytes) pkts bytes target prot opt in out source destination 201 19597 ETH0_OUT all -- * eth0 0.0.0.0/0 0.0.0.0/0 Chain ETH0_IN (1 references) pkts bytes target prot opt in out source destination Chain ETH0_OUT (1 references) pkts bytes target prot opt in out source destination As seen above, there are no packet and byte values for ETH0_IN and ETH0_OUT, which is not the same result in the tutorial I referenced. Is there a mistake that I made somewhere? Thanks for your time.

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• Good HTTP Monitoring tools

  - by ffffff

  I look for HTTP to work with a Linux system server monitor tool every protocol. I know, and will not there be it in whom or a freeware? When, for example, I dump 80/tcp with a packet monitor to be concrete # tethereal -i ppp0 port 80 -x Capturing on ppp0 1244206390.030474 219.111.xx.xx -> 74.125.xx.xx HTTP GET /search?output=js&num=0&dt=1244206414703&client=pub-3031568651010206&q=Cagliari%20Flight&ad=n3&ie=utf8&oe=utf8&channel=0091594208&adtest=off HTTP/1.1 0000 00 04 02 00 00 00 00 00 00 00 00 00 00 00 08 00 ................ 0010 45 00 01 e5 ee 82 40 00 40 06 d2 b5 db 6f 02 5b E.....@[email protected].[ 0020 4a 7d 4f 93 d4 29 00 50 3e df 4c 63 4b 6b 42 e0 J}O..).P>.LcKkB Such output is provided, but there is too much unnecessary information such as an SYN packet or a header. What I want The IP address of the client and sending out character string(Get; the contents of the POST) Among the output character string of the server only as for the HTML (Content-Type:) I am what is chisel) of a thing of text/html. I can set a filter and am the best if only information wanting can accumulate in the log.

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• General Process of Website Development

  Websites are an essential part to running a successful business. It must comply with W3C standards, accessibility guidelines and Web 2.0 specifications.

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• Should I listen to my employer and use CASE tools?

  - by omsharp

  My employer (Not a Developer) thinks that CASE tools will help us improve our development process and documentation. I am not sure about that, we are a small team of 5 developers building mobile banking solutions for local clients. I think CASE tools will be a waste of time and money as they need to be purchased and we will need some time before we get used to them and be efficient working with them for modeling and stuff. Code generation is another issue, I really think that the CASE generated code won't be as good as code written by good developers. I think that if we stick with agile princeliness, design patterns, use TDD, and keep our code clean. we should be good. And as far as Analysis and Design, I think simple UML diagrams on whiteboard should do the trick. Documentation is good and important, but should be made as little as possible and we should not focus on Docs and forget the code. This is what i think. Am I correct? or should I listen to my employer and start researching for an appropriate CASE Tool?

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• monitoring TCP/IP performance on Solaris

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck?

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• Game crash/Screen freeze recovery (without shell or reboot)

  - by Asavar Tzeth

  I am an old Windows PC gamer, now converted into Ubuntu (Linux) lover. I am even going so far as to attempt to replace all my games in a Windows dual-boot with Wine and it is going well. However... Even if Linux is less prone to crashing, games, especially the windows ones (but also a few native) can crash. My problem is when this is in full screen and the computer becomes non-responsive. In Windows you can solve this with ctrl+alt+delete, but Ubuntu lacks this feature and my only choice is a reboot. Is there any Ubuntu version of this feature? Of course excepting the ctrl+alt+F1, find and kill process method. It is fine if you know how to do it, but too slow and difficult for the typical gamer. I believe strongly in Ubuntu as the future gaming platform in one form or another. If this feature does not exist, then the Ubuntu team should address this as fast as possible, since it is critical for all old Windows gamers. Thank you for your time. Asavar Tzeth (Alias)

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• Simple step by step process to import MS Access data into SQL Server using SSIS

  Sometimes we need to import information from MS Access. We could use the Microsoft SQL Server Migration Assistant, but sometimes we need to add custom transformations and it is necessary to use more sophisticated tools. In this tip, we are going to walk through step by step how to migrate a MS Access table to SQL Server using SQL Server Integration Services (SSIS). What are your servers really trying to tell you? Find out with new SQL Monitor 3.0, an easy-to-use tool built for no-nonsense database professionals.For effortless insights into SQL Server, download a free trial today.

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• Is Zabbix the right tool for me?

  - by hortitude

  I just want to monitor a small handful of servers (less than 10). From reading various places it sounds like the top leading contenders (for open source at least) are: nagios munin zabbix From what I have read a lot of people tend to use munin and nagios together -- munin for history and graphs, and nagios for alerting. On the other hand it sounds like Zabbix is a more complete solution and easier to configure than either of the other two. So I was thinking of going that route. My thoughts right now are: What are the general disadvantages of Zabbix? Does Zabbix have a small footprint on boxes it is monitoring? Do I really need to setup an entire other server for it? I currently have a server that is under very light load -- can I dual purpose it?

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• design an extendible and pluggable business logic flow handler in php

  - by Broncha

  I am working on a project where I need to allow a pluggable way to inject business processes in the normal data flow. eg There is an ordering system. The standard flow of the application is A consumer orders an item. Pays for it and card is authorized. Admin captures the payment. Order is marked as complete and item is shipped. But this process may vary (extra steps in between) for different clients. Say a client would need to validate the location of the consumer before he is presented with a credit card form, OR his policies might require some other processes in between. I am thinking of using State Pattern for processing orders, saving the current state of the order in database, and initializing the state of order from the saved state. I would also need some mechanism, where a small plugin would be able to inject business specific states in the state machine. Am I thinking the right way? Are there already implemented patterns for this kind of situation? I am working with Codeigniter and basically this would mean for me, to redirect to proper controller according to the current state of the order. Like, if the state of the order is unconfirmed then redirect the user to details page and then change the state to pending. If some client would need to do some validation, then register an intermediate state between unconfirmed and pending Please suggest.

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• "TDD is about design, not verification"; concretely, what does that mean?

  - by sigo

  I've been wondering about this. What do we exactly mean by design and verification. Should I just apply TDD to make sure my code is SOLID and not check if it's external behaviour is correct? Should I use BDD for verifying the behaviour is correct? Where I get confused also is regarding TDD code Katas, to me they looked like more about verification than design; shouldn't they be called BDD Katas instead of TDD Katas? I reckon that for example the Uncle Bob bowling Kata leads in the end to a simple and nice internal design but I felt that most of the process was centred more around verification than design. Design seemed to be a side effect of testing the external behaviour incrementally. I didn't feel so much that we were focusing most of our efforts on design but more on verification. While normally we are told the contrary, that in TDD, verification is a side effect, design is the main purpose. So my question is what should I focus on exactly, when I do TDD: SOLID, external API usability, or something else? And how can I do that without being focused on verification? What do you guys focus your energy on when you are practising TDD?

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• Design help with parallel process

  - by brazc0re

  I am re-factoring some code and an having an issue with retrieving data from two parallel processes. I have an application that sends packets back and forth via different mediums (ex: RS232, TCP/IP, etc). The jist if of this question is that there are two parallel processes going on. I hope the picture below displays what is going on better than I can word it: SetupRS232() class creates a new instance of the SerialPort by: SerialPort serialPort = new SerialPort(); My question is, what is the best way that the Communicator() class, which sends out the packet via the respective medium, get access to the SerialPort object from the SetupRS232 class? I can do it with a Singleton but have heard that they are generally not the best design to go by. I am trying to follow SRP but I do feel like I am doing something wrong here. Communicator() will need to go out of it's way to get access to SetupRS232() to get access to the SerialPort class. I actually haven't found a way to even get access to it. Would designing each medium class, for example, SetupRS232(), SetupTCPIP, as a singleton be the best way to approach this problem?

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• Prevent Java application from accessing/monitoring/altering clipboard contents

  - by mcstrother

  I'm a student using a service that provides practice questions for standardized tests. The service requires that I access the questions by downloading and running a Java application. If I try to copy anything from any window of my computer (including applications unrelated to the question bank) while the application is running, the copied item is replaced with an obnoxious message asking me to not pirate their copyrighted material. I find this obnoxious, and I also really don't like the idea that any application can slurp up any and all potentially sensitive information that I happen to copy while it's running. Is there are a way to limit the privileges of this application to stop it from doing this? Thank you!

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• Monitoring folder diffs across servers with zabbix

  - by Marcus

  Problem: I want to make sure that a certain folder is equal regarding it's contents across my servers. I do not want an automatic filesync to keep them equal, changing is done manually. My initial thought was to once a day calculate some crc/hash on folder and send to Zabbix, and trigger when values differ. Is there any good tools out there that can calculate crc or similar of a folder? Anyone know of another solution that solves my problem?

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• How does the Ubuntu upgrade process work?

  - by IDWMaster

  How does Ubuntu upgrade seamlessly to a newer distribution, while the operating system is still running? I'm upgrading from 10.10 to 11.04, and I've upgraded several times before, and it's as simple as running update-manager -d and downloading and installing them, then rebooting. How exactly does this work though? How is the upgrade manager able to update the operating system while it is still in use?

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• Software for defining rules for folder permissions and monitoring deviations

  - by Kjensen

  Let's say a company has a large number of users, and each user has a home area. On each share used for home area folders, I would like to define some rules saying who is supposed to have which permissions on the folder. Then I would like to audit automatically, that this is actually the case and get some sort of report on deviations. So a rule for \MegaServer\Home01 could be defined something like: Domain Admins - Full Control Backup Agent - Read [Home folder owner] - Full Control I am talking about Windows platform and Windows servers, although I think it would most likely also work for *nix machines that expose Windows shares. Does software like this exist? I could roll my own basic version, but if something already exists, that is usually a better option. I am aware of tools to make displaying permissions easier (AccessEnum, DumpSec), but that is not what I am looking for.

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• 2 Step Process to Flood Your Website With Free Traffic For Years to Come

  Do you want to get truckloads of targeted website traffic to your internet home business for free? Are you striving hard to get just 5 to 10 visitors to your website every single day? Isn't it frustrating?

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• Correct process for creating builds reliant on 3rd party packages

  - by Patrick

  I work on a Symfony 2 codebase. We use a number of third-party packages (most are in the Symfony Standard Edition). We use composer for dependencies. We current have all of our third-party code committed in our repository (after changing .gitignore files) to ensure stability. According to Proper Programming Practices™, we are not supposed to have any third-party packages in our repo. We are supposed to pull them down and include them at build time. How are we to do proper QA and debugging when at any given time our dependencies could push an update that breaks functionality?

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• Process that needs a volume starting before volume mounts

  - by user36126

  The destination for incoming CrashPlan backups on my server (11.04) is /media/SeagateBig (SeagateBig is the volume name of my 2TB USB drive). When the server boots, two things happen: 1) SeagateBig auto-mounts and 2) CrashPlan starts. The problem is, that often these two things don't happen in that order. Then I get: Crashplan starts looks for /media/SeagateBig doesn't find it instead of waiting for it, CREATES IT Now it's backing up onto my / filesystem. NOT COOL. Meanwhile, when SeagateBig finally gets around to mounting, it finds that /media/SeagateBig already exists, shrugs, and creates /media/SeagateBig_ as its mount point. What I need is a way for the order to be enforced - where SeagateBig mounts and then and only then the CrashPlan service is started. Unless I learn that CrashPlan can be told to wait for its destination directory, never to create it... which I am also investigating. But the CrashPlanEngine script is installed by the product so I am loath to modify it, as I know I could by having it loop until df greps successfully for "SeagateBig".

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