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• write-through RAM disk, or massive caching of file system?

  - by Will

  I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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• bash : "set -e" and check if a user exists make script exit

  - by Dahmad Boutfounast

  i am writing a script to install a program with bash, i want to exit on error so i added "set -e" in the beginning of my script. the problem is that i have to check if a user exists inside of my script, to do this i am using "grep "^${USER}:" /etc/passwd", if the user exists, the script runs normally, but if the user doesn't exist, this command exists, and i don't want to exit on this case (i have to create the user and continue my installation). so what's the solution to make my script continue running ?? i tried to redirect the output of "grep" to a variable, but i still have the same problem :( thanks.

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• Setting the Timezone with an automated script

  - by Tom

  I'm writing scripts to automate setting up new slicehost installations. In a perfect world, after I started the script, it would just run, with no attention from me. I have succeeded, with one exception. How do I set the timezone, in a permanent (survive reboot) and sane (adjust for standard and daylight savings time, so no just forcing the date) ... manner that doesn't require input from me? Currently, I'm using dpkg-reconfigure tzdata This doesn't seem to have any way to force parameters into it. It demands user input. EDIT: I'm editing here, rather than commenting, since comments don't seem to allow code blocks. Here's the actual code I ended up with, based on Rudedog's comment below. I also noticed that this doesn't update /etc/timezone. I'm not certain who uses that, but in case anybody does, I'm setting that too. TIMEZONE="America/Los_Angeles" echo $TIMEZONE > /etc/timezone cp /usr/share/zoneinfo/${TIMEZONE} /etc/localtime # This sets the time

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• Why is DAVExplorer not connecting?

  - by C.W.Holeman II

  DAVExplorer is not connecting. Connecting to a WebDAV Server states: Once you have entered a location URL, and (if necessary) your login name and password, DAV Explorer will connect to the remote WebDAV server, and request a listing of the resources there. A hierarchical view of the sub-collections will be displayed Invoke Apache Jackrabbit $ java -jar jackrabbit-standalone-2.0.0.jar --port 8200 Welcome to Apache Jackrabbit! ------------------------------- Using repository directory jackrabbit Writing log messages to jackrabbit/log Starting the server... Apache Jackrabbit is now running at http://localhost:8200/ Use DAVExplorer $ java -jar DAVExplorer.jar Then connect to localhost:8200/repository/default/ which pops up: Login ===== Login name: [admin] Password: [admin] <OK> The pop up closes then nothing changes. Using cadaver confirms Jackrabbit is working: $ cadaver http://localhost:8200/repository/default/ Authentication required for Jackrabbit Webdav Server on server `localhost': Username: admin Password: dav:/repository/default/> ls Listing collection `/repository/default/': succeeded. Coll: com 0 Mar 13 11:07 Coll: it 0 Mar 13 11:07 Coll: net 0 Mar 13 11:07 Coll: org 0 Mar 13 11:07 Coll: za 0 Mar 13 11:07

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• Controlling an amplifier power supply from Squeezebox/SqueezeCenter

  - by teabot

  I have a Squeezebox that is connected to an amplifier. I'd like the amplifier to switch on/off whenever the Squeezebox is powered on/off. I don't mind writing some plugin code to SqueezeCenter to do this but in hardware terms I am looking for off-the-shelf components. I imagine that I need some kind of Ethernet controlled power outlet. I have looked at X10 (I can't bring myself to link to their terrible site), but their product range seems extremely confused and it looks as though I'd have to use both RF and comms-over-mains to implement a computer controlled socket. Does anyone have any alternative suggestions? Note: Any components should be available and certified for use in the UK.

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• Need to get a file written to a floppy.

  - by dboarman-FissureStudios

  I asked this question over on SO. I have tried dd if=kernel.sys of=/dev/fd0 bs=512 seek=1 to get this file to write to the floppy. It is a kernel shell that must be written to the sector immediately following the bootsector of a disk to boot the PC. No matter what I've tried, for some reason, kernel.sys is not writing to the floppy. I know the bootstrap loader is being written and executed. However, it cannot find the kernel to load the shell. Any ideas on what I am doing wrong? I mean, really, how is it so difficult to get this file written to a floppy? OpenSUSE 11.2

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• Determining Serial Driver Supported Baud Rates

  - by Jim Fell

  Hello. How can I determine the baud rates supported by my serial driver? My driver details (from the Device Manager) follow, but they do not seem very helpful. I am writing an application that is crashing because I am apparently attempting to to set COM1 to an unsupported baud rate, so I need to know which baud rates the driver does support. Any suggestions would be appreciated. Thanks. Driver files: C:\Windows\system32\drivers\serenum.sys C:\Windows\system32\drivers\serial.sys Provider: Microsoft Corporation File Version: 5.1.2600.5512 (xpsp.080413-2108)

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• What is this dm-0 device?

  - by Jeff Shattock

  While poking around trying to figure out why a Linux - Linux file transfer is running slower than I think it should, I stumbled across something I'm not familiar with. /dev/dm-0 seems to be my bottleneck, but I have no idea what it is. On my destination server, the iostat command shows a device at the bottom, /dev/dm-0, as being 100% utilized. This server has 6 disks in a mdadm raid5 set, with LVM running on top of it. Each of the underlying disks are sitting around 50% util. The transfer is writing to a logical volume located on this raidset. What is this /dev/dm-0 thing? Once I know what it is, maybe I can find how to increase its speed, or at least understand why its the speed that it is.

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• Why does iis produce 500 response on all requests?

  - by HMR

  In IIS 7.5 on Windows webserver 2008 I get a 500 response on any request. Checking in firebug if I'm being forwarded but the request is made and no forwarding, just get 500 response with a page that looks like Symfony response page. Disabled all url re writes and requested index.html (still get 500) checked error pages under featured settings and detailed errors is checked. Checked the php error log and no writes have been made for several days. I think someone has fiddled with the IIS server settings and got it to return 500 for any request (even locally) but I'm not able to find what it is. [UPDATE] While I was writing this and listing things I've tried I tried selecting detailed error messages at the root node, not the site node. Looks like some idiot changed file permissions so that IIS can no longer read the config file.

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• Tool to check if XML is valid in my VS2012 comments

  - by davidjr

  I am writing the documentation for our companies software developed with vs2012. I need to add xml examples to the summary of each class, due to xml instantiation of objects. We are using sandcastle to create the documentation (company choice), and I want to be able to review my xml comments without building the help file every time. Is there an application that anyone would recommend where I can view how the xml renders before I build the help file? Here is my example: /// <summary> /// Performs DFT on a data array, writes output in a CSV file. /// </summary> /// <example> /// <para>XML declaration</para> /// <code lang="xml" xml:space="preserve"> /// %lt;DataProvider name="DftDP" description="Computes DFT" etc... I want to check the XML to make sure it is valid, maybe by copy and pasting it into a tool of some sort?

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• Converting date format in formulas in Excel

  - by Casebash

  I have a column of dates in the following format ddd mmm dd hh m:s "EST" yyyy. In another cell in another sheet, I wish to have the dates in the format dd/m/y. How can I do this? I already tried the DATEVALUE function. Seeing as the positions are fixed, I started using the RIGHT and MID functions to extract components to put into the DATE function. Unfortunately, I don't know of a way of converting the three letter string to a month without writing a huge if block. UPDATE: I managed to convert the string using MONTH(1&THREE_LETTER_DATE). I am still curious if there is a better solution though

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• What WYSIWYG software can I use to create a web page?

  - by Roman

  I always made web pages by writing HTML code but now I would like to try to use some WYSIWYG approach. Can anybody recommend me a program which I can use for that? I mean a program in which you can move buttons, tables, pictures by mouse. You can change size and shape by mouse. You can use nice templates for "block of text", buttons, background and so on. I am using Windows 7. May be I already have something pre-installed?

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• Where can I learn various hacking techniques on the web?

  - by Carson Myers

  I would like to try my hand at hacking -- that is, exploiting various website vulnerabilities. Not for any illegal purpose mind you, but so I can have a better understanding and appreciation of these exploits while writing my own web software. I seem to recall that there was a community that hosted a bunch of demo websites, and you had to find and exploit certain vulnerabilities with each one. I can't remember what it is called but this is the sort of thing I am looking for -- I have read a tonne of little XSS and CSRF examples but have yet to find a real-life hands-on example of one. Does anyone know of such a place, where I can be given an example page and look for security holes? I would really rather not try this with actual websites, I don't want to break any laws.

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• Dump output from REPL

  - by Ankit Soni

  I'm writing SML programs, and I'd like a way to quickly see the output from running a program in the REPL without actually running the REPL (to quickly see if a program has syntax errors - I plan to use this as a make program for .sml files in vim to view the output inside vim).. Currently, I have this: sml file.sml | echo -e "\004" So it runs the program, and then echoes Ctrl-D to exit the REPL. The problem is that its too quick to send the Ctrl-D key, so there is no output. I tried this too: sml file.sml | sleep 2 ; echo -e "\004" But that isn't doing it either. Any ideas on how I can get a dump of the output from the REPL?

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• Product Recommendation: Good job scheduler for windows servers?

  - by Bret Fisher

  Looking for a mostly-GUI tool that is low cost (less then $1k, but not required) and allows you to create scheduled tasks and jobs without writing vbscript, batch files, or powershell. Something simple that speaks SMB/CIFS, SMTP, LDAP, etc. for such things as "delete some files based on a list of folders from this text file" or "disable all users with expired accounts" or "delete all disabled users not in this AD group". I've seen some of the big multi-OS enterprise task automation systems and they just look way overkill. We're a windows-only shop, Server 2003 or newer and there's got to be a simple non-agent based product that is drag-n-drop for some of this basic automation. Today we use all three languages mentioned above, and the scripts are not as reliable as a workflow-based-tool would be. Thanks.

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• Advantage of using a smartfox server

  - by Fahim Akhter

  Hi, we are trying to outsource the server side of our game applicaton to someone. They recommend using http://www.smartfoxserver.com/ instead of our traditional php/mysql combination. Our game is in actionscript and will be using social aspects of facebook later on. Smartfoxserver is supposed to reduce the time of development. The thing I'm having a hard time getting right now is how? How does it reduce the time. We will still be making a RDMS writing stored procedures and game logic based server scripts. Where does smartfox come into play? Thanks, Fahim.

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• Media Information for Constant and Variable bit rate of Video files

  - by cpx

  What is this Maximum bit rate for a .mp4 format file whose bit rate mode is Constant? Media information displayed for MP4 (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : No Format settings, ReFrames : 1 frame Codec ID : avc1 Codec ID/Info : Advanced Video Coding Bit rate mode : Constant Bit rate : 1 500 Kbps Maximum bit rate : 3 961 Kbps Display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 29.970 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.163 In this case where the bit rate mode is set to Variable, is the Bit rate field where the value is displayed as 309 is its average bit rate? Media information displayed for M4V (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : No Format settings, ReFrames : 1 frame Codec ID : avc1 Codec ID/Info : Advanced Video Coding Bit rate mode : Variable Bit rate : 309 Kbps Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 23.976 fps Minimum frame rate : 23.810 fps Maximum frame rate : 24.390 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.229 Writing library : x264 core 120

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• Linux - Scriptable email client?

  - by Phog

  Hi, I'm writing a simple UI for the visually impaired using a speech synthesizer. I've looked all over the internet for an email client which I can script to fit these purposes but to no avail. I believe several CLI email clients(eg MUTT) allow sending emails with command line arguments only. But I've yet to find a client that can download the emails, decode them and then dump them to a text file. The best candidate so far seems to be mailx, but it seems like it needs quite a lot of babysitting to fit my needs. Any suggestions for scripting-friendly email clients? Am I missing something fundamental about MUTT? Are there any libraries/programs that help me decode the MIME encoding used in todays emails from a maildir? Should I just bite the bullet and write a script for mailx? Thanks in advance.

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• How do I get Dreamweaver to deploy syntax highlighting for full script CFC's?

  - by Mel

  Is there a way to get Dreamweaver CS4 to use syntax highlighting when writing full script CFCs? If the document type is .cfc and they syntax is fullscript, there is no syntax highlighting; the code will be in black text... For example, the following block of code will appear without syntax highlighting: component extends="whatever" output="false" { public void foo() { } } While the tag equivalent would be highlighted normally: <cfcomponent extends="whatever" output="false"> <cffunction name="foo" returnType="void" access="public"> </cffunction> </cfcomponent>

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• Office 2011 Mac - Unable to save Word files, plus normal.dot alert errors

  - by Jeff D

  There are actually 3 errors here. When I open Word, I get: Word cannot open the existing global template. () If I create a file, type a character and try to save to the desktop (that I have no problems writing to otherwise), I get: Word cannot save or create this file. The disk may be full or write-protected. Try one or more of the following: * Free more memory * Make sure that the disk you want to save the file on is not full, write-protected, or damaged. () I am just saving to the desktop, and I can save excel files (or anything else) there. After the failure, if I save again, the default file name becomes: .doc...doc Weird. Finally, when I close word completely, I get: Do you want to replace the existing Normal.dotm.

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• What steps put my bash prompt commands into vim and then back again to bash to execute?

  - by xtian

  I've enabled VIM style editing of bash commands at the bash prompt as default bash setting. On a few occasions I've accidentally opened a blank vim file with some complex bash command I was writing. Awesome. How do I get the newly written line in vim back into bash? I found another post where the author had the opposite trouble--or so it seems. What steps put my bash prompt commands into vim and then back again to bash to execute?

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• Throughput = BS * IOPS?

  - by Marvin

  I've seen in many places that throughput = bs * iops should be true. For example writing at 128k block size to a SAS disk that can support 190 IOPS should give a throughput of ~23 MBps - 23.75(MBs) = 128(BS)*190(SAS-15 IOPS)/1024. Now when I tested it in a VM against a monster NetApp filer I got theses results: # dd if=/dev/zero of=/tmp/dd.out bs=4k count=2097152 8589934592 bytes (8.6 GB) copied, 61.5996 seconds, 139 MB/s To view the IO rate of the VM I used iostat and esxtop, and they both showed around 250 IOPS. So to my understanding the throughput was supposed to be ~1000k: 1000(KBs) = 4(BS)*250(IOPS). dd of 8GB is twice the size of RAM of course, so no page caching here. What am I missing? Thanks!

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• How to automate kinit process to obtain TGT for Kerberos?

  - by tore-

  I'm currently writing a puppet module to automate the process of joining RHEL servers to an AD domain, with support for Kerberos. Currently I have problems with automatically obtain and cache Kerberos ticket-granting ticket via 'kinit'. If this were to be done manually, I would do this: kinit [email protected] This prompts for the AD user password, hence there is a problem with automate this. How can i automate this? I've found some posts mentioning using kadmin to create a database with the ad users password in it, but I've had no luck. Thanks for input

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• Notepad Automatically Launches Upon Boot Up of my Windows 7 64-Bit Desktop PC

  - by Simon

  Around 12 months ago, When my Windows 7 PC boots up, Notepad started to appear automatically on the desktop (as a duplicate ie one on top of the other), both displaying the same writing inside, and the name of the Notepad was: desktop-Notepad. [.ShellClassInfo] LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-21787 I cant remember the exact details as its been so long now but a friend told me, this was due to a "hidden attribute" belonging to notepad becoming "unhidden"and therefore showing itself on the desktop at startup. He showed me a series of steps to either hide the attribute again or to delete it ( telling me that upon restart of my computer it would be recreated/regenerated.) I did indeed follow his guidance however after trying to hide it or delete it (it was never recreated after restart which supposedly it should have done) One notepad still is autolaunched with the text as shown above everytime I startup my PC. As I found this forum I thought I might try again for a solution to prevent notepad from launching. Thankyou

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• Finding throuput of CPU and Hardrive on Solaris

  - by Jim

  How do i find the throughput of a CPU and the Hardisk on an open solaris machine. Using MPstat or iostat. I'm having a hard time identifying the throughput if it is given at all in the commands output. Eg. in mpstat there is very little explanation as to what the columns mean http://docs.sun.com/app/docs/doc/816-5166/mpstat-1m?l=en&a=view&q=syscl+mpstat I've been using the syscl column divided by time interval to find the throughput but to be honest i have no idea what a system call truelly is. I'm trying to to analyze a hardrive and CPU while writing a file to the hardisk and when at rest Thanks in advance. Jim

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