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• Is LSB's init script function "start_daemon" really used for real daemons or should I stick to start-stop-daemon?

  - by Fred

  In the context of init scripts, according to the LSB specification, "Each conforming init script shall execute the commands in the file /lib/lsb/init-function", which then defines a couple of functions to be used when using daemons. One of those functions is start_daemon, which obviously "runs the specified program as a daemon" while checking if the daemon is already running. I'm in the process of daemonizing a service app of mine, and I'm looking at how other daemons are run to try to "fit in". In the process of looking how it's done elsewhere, I noticed that not a single daemon on my Ubuntu 10.04 machine uses start_daemon. They all call start-stop-daemon directly. Same goes for my Fedora 14 machine. Should I try to play nice and be the first one to use start_daemon, or is there really no point and start-stop-daemon is the way to go since everybody is already using that? Why is there no daemons using LSB's functions?

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• no download and install progress, no error message (no text at all!) for sudo gem install merb

  - by Delirium tremens

  I'm using ruby 4.2, rubygems 1.3.5-1ubuntu2 and Ubuntu Lucid Lynx. I installed ruby and rubygems with Synaptic. Since "The gem command will output its progress while it sucks down and installs all the necessary gems for a full Merb install. " is written at http://wiki.merbivore.com/howto/installation/gems, when I type sudo gem update --system, I get: "ERROR: While executing gem ... (RuntimeError) gem update --system is disabled on Debian. RubyGems can be updated using the official Debian repositories by aptitude or apt-get." and rubygems has list, build and help commands, I'm wondering if in Ubuntu rubygems is used only for something other than downloading. If it isn't, why isn't rubygems showing any text for sudo gem install merb?

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• Does a hidden UIViewController consume any resources (iPhone)?

  - by MrDatabase

  My simple iPhone game has two basic "screens": home screen (UIViewController subclass) game screen (UIWindow w/ EAGLLayer where all the OpenGL drawing happens) Currently when the user taps "Play" on the homescreen the UIViewController is just hidden and the game screen is revealed. When the game is over the homescreen UIViewController is unhidden. Does the hidden UIViewController consume any resources when it's hidden?

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• How to delete files quicker than rm -rf?

  - by Byakugan

  Is there any way how to delete folder/files quicker than with command rm -rf? It seems my disc is filled with bilions of files (sessions of php5) which were not deleted in cron so I need to delete them manually but it takes hours and it is still not helping reducing the amount. Thank you. My command: rm -rf /var/lib/php5/* Tried also these commands: find /var/lib/php5 -name "sess_*" -exec rm {} \; And perl -e 'chdir "/var/lib/php5/" or die; opendir D, "."; while ($n = readdir D) { unlink $n }'

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• Real-Time chat translation on mac using either Skype, Adium or iChat

  - by Cawas

  If you're looking for MSN and / or Windows, just go here. I'm looking for Real-Time chat translation tools for Mac, and preferably using Adium, but it could be for Skype, iChat or maybe another option if it's really good. So far I could only easily find a plugin for Adium, simply called translator, that uses google, dicts and babelfish, but you have to type commands in and paste the words or sentences, and it's currently not even working on Snow Leopard. Even if it did, it's still not quite as automatic as we'd expect (or see in other platforms as indicated). So I'm just citing it as an example of a bad solution.

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• When should I opt for test driven development?

  - by VJ

  My question is same as the title. I have not done Test driven development yet,I have performed unit testing and I am aware of testing in general but I hear it is much advantageous to follow TDD?. So should I opt for it everytime or are there some preconditions... i just need to know some basic or important requirements when i should opt for TDD. Sorry if this question is too trivial.

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• Replying to mail with attachments using Zend framework..

  - by Ali

  Hi guys I'm integrating basic email capabilities in my application and I would like to be able to incorporate a decent reply / forward email facility. I have it covered with sending my own uploaded attachments but what about in situations where I recieve a message in my inbox with attachments and wish to forward that same message along with the attachments already attached to it as well as be able to choose which of the attachments to include and which not to.

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• Building a simple cart using object orientated PHP

  - by James

  I've built basic shopping carts with PHP before but in an attempt to get my feet wet with OOP, I'd like to try using that method. I come from a design background but do understand some basics of OOP but would like to see a tutorial or something simple I could base this on. The site is small and the cart functionality required is very standard. Can anyone offer a link to a decent tutorial or article on building a Cart with PHP OOP, a quick google didn't turn up anything decent.

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• removing a line from a text file?

  - by Blackbinary

  Hi all. I am working with a text file, which contains a list of processes under my programs control, along with relevant data. At some point, one of the processes will finish, and thus will need to be removed from the file (as its no longer under control). Here is a sample of the file contents (which has enteries added "randomly"): PID=25729 IDLE=0.200000 BUSY=0.300000 USER=-10.000000 PID=26416 IDLE=0.100000 BUSY=0.800000 USER=-20.000000 PID=26522 IDLE=0.400000 BUSY=0.700000 USER=-30.000000 So for example, if I wanted to remove the line that says PID=26416.... how could I do that, without writing the file over again? I can use external unix commands, however I am not very familiar with them so please if that is your suggestion, give an example. Thanks!

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• Rails has-and-belongs-to-many form question

  - by swilliams

  Sorry for the semi-generic title, but I'm still pretty new at rails and couldn't think of a succinct way to put the question. I have a basic habtm model setup: a Project has many Resources and a Resource can have many Projects. I have the database and models setup properly, and can do everything I need to via the console, but I'm having trouble translating it all into the view. On the show view for the Project, I want to be able to create a Resource and automatically assign it to the current Project. Here's my basic html: <p> <b>Name:</b> <%=h @project.name %> </p> <h2>Equipment</h2> <ul> <% @project.resources.each do |r| %> <li><%=h r.name %></li> <% end %> </ul> <h2>Add A Resource</h2> <% form_for(@project) do |f| %> <%= f.error_messages %> <p> Resource Name:<br /> <%= f.text_field :resources %> </p> <p> <%= f.submit 'Create' %> </p> <% end %> Obviously, that form won't work, but I'm at a loss for what to do next. I've searched around for various examples, but haven't found one for what I'm trying to do here. One thing I've thought of was to change the form to be form_for(Resource.new) and include a hidden input of the @project.id. And then when the resource_controller handles the form, check for that id and go from there. That seems like an ugly kludge though.

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• Why does nothing in WPF have a click event?

  - by Shane

  This seems very strange to me. I know through some adventurous inheritance you can convert most UIElements to a button, but it is a cumbersome way of implementing the most basic of of computer events

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• Thread signaling basics

  - by Markust

  Hello! I know C# , but I am a total newbie regarding threading and I am having trouble to understand some basic (I think) concepts like signaling. I spent some time looking for some examples, even here, without luck. Maybe some examples or a real simple scenario would be great to understand it. Thanks a lot in advance.

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• Can Android OS be programmed to interface with a external device via the mini-USB port?

  - by user322865

  Basic example, if I bought a chipset with a light socket and bulb soldered to the chipset; then put a USB cable with the mini-USB plug on the end to get plugged into the android phone. Can I write a Java application to turn on/off the light, get the status of the light(on/off) and maybe power a super-small led/bulb with power from the phone itself? Any insight at all would be greatly appreciated. Thank you

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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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• Merging code with dependencies? - Javascript

  - by RadiantHex

  Hi folks, this might be quite simple, but I must say I'm a bit confused on this topic. I'm writing code based on two popular libraries: jQuery underscore.js I am just wondering what would be the best way to isolate the code and prevent conflicts and how to merge it with its dependencies. By merging I mean putting them within the same file. :) I hope I'm not asking something which is too basic. ...and a last thing MERRY CHRISTMAS EVERYONE! =D

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• Facebook Application with .net Starting facebook toolkit

  - by AjmeraInfo

  i am new for facebook application please help me for how to start and what is basic steps for add application to facebook i have used facebook toolkit 3.1 beta version. but after authentication it will generated error... i want to create iFream application i want to craete gift send application. so which one is best iFream or FBML. Please it is urgent help me.

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• New-ActiveSyncMailboxPolicy "not implemented" on Exchange 2007 SP3

  - by Flo

  If I try to run: New-ActiveSyncMailboxPolicy Test directly in the Powershell, it asks me if im sure, and if so, it does what it should. But if I try the same from my example Code in C#, then I get an error, saying that "the current host does not implement it". Other Commands like Set-CASMailbox or Get-ActiveSyncMailboxPolicy work just fine, both in the powershell and my application. The Exchange Server/Windows Server 2008R2 and Domain are all setup completely new (test-environment). Is there a way to make this possible?

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• What is the proper syntax for describing a <SELECT> form element to Zend_Form using XML as the confi

  - by ben

  I am using an XML config file to tell Zend_Form what elements I want. I would like to have a element, but I am unsure as to how to add tags using the XML syntax. Sure I am missing something pretty basic. Ben

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• Moving FederatedEmail/SystemMailbox from One Store to Another - Exchange 2010

  - by ThaKidd

  Hello all. Just upgraded from Exchange 2003 to 2010. Somehow, I have two mailbox databases on my single Exchange 2010 server. One database contains all of the mailboxes I had moved from the 2003 exchange server; the other contains two SystemMailboxes and one FederatedEmail box. I am just starting to get a grasp on the commands used in the EMS. I was wondering if someone could point me in the right direction to move these three "system" mailboxes into my actual mailbox database so I can eliminate the second database. Just trying to sure up this one server before I role out my backup Exchange server. Thanks in advance! Your help and ideas are greatly appreciated as I try to make this setup as simple as possible.

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• Use Apache authentication in Django without popup

  - by chernevik

  I am using Apache to authenticate users for Django, but I would like to do so without the popup form that Apache uses in its basic configuration. How do I embed the login form within a page while still using Apache for authentication? That is, I'd like a page that says "Please login" and provides a form asking for username and password, and passes this information on to Apache for authentication. (I'd do this over an SSL connection, of course.)

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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• Locking a file to verify a single execution of a service. How reliable?

  - by Camilo Díaz

  Hello, I am deploying a little service to an UNIX(AIX) system. I want to check if there is no active instance of that service running when starting it. How reliable is to implement that check like this? Try to acquire a lock on a file (w/ FileChannel) If succeeds, keep lock and continue execution If fails, exit and refuse to run the main body I am aware of software like the Tanuki wrapper, however, I'm longing for a simpler(maybe not portable) solution. Regarding PIDFILE(s): I want to avoid using them if possible, as I don't have administrative rights on the machine, neither knowledge in AIX's shell programming.

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• Using ROBOCOPY to MOVE data around, not copy it

  - by Nate Bross

  I have the following powershell script, which executes a few robocopy commands: ROBOCOPY.exe $q3 $q4 /R:5 /W:15 /S /NP /MT:32 /XA:SH /XJD ROBOCOPY.exe $q2 $q3 /R:5 /W:15 /S /NP /MT:32 /XA:SH /XJD ROBOCOPY.exe $q1 $q2 /R:5 /W:15 /S /NP /MT:32 /XA:SH /XJD ROBOCOPY.exe $src $q1 /R:5 /W:15 /S /NP /MT:32 /XA:SH /XJD This works fine, but it takes a really long time, I'm wondering, if there is a way that I can have robocopy do a "cut + paste" instead of a "copy + paste" so windows will move the NTFS pointer to the file, instead of actually copying all of the bits of each file?

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• Compiling LAMP from source - apache2 error “no MPM package installed”

  - by kenny99

  Hi, I've compiled LAMP from source on a Ubuntu VPS. I had to remove a previously installed version of Apache then I manually compiled all the packages, which seems to have worked up unto a point - however, when I try to run commands like "/etc/init.d/apache2 restart" I get the following error - No apache MPM package installed. I have installed mpm-prefork so I don't know why i'm getting this problem. My configure command is as follows: ./configure --enable-so --enable-modules=most --with-mpm=prefork I have deliberately not used apt-get to install anything and want to avoid this if possible. Anyone have any guidance on how to resolve this error? Thanks in advance

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• Wait Cursor Error

  - by felixd68

  I'm coding an advanced web browser. The bad thing is, is that whenever you move your cursor over the window, a wait cursor is displayed. I tried to deselect the wait cursor but it doesn't work! I'm using Visual Basic 2010 Beta 2... Please help!!

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