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  • compare a string in two files

    - by Tarun
    I am trying to get the name of the user from one file and their corresponding details from my other file. I use the command awk -F : '{ print $1 }' user-name it gives me the list of all the user's. So now how can I match these names with the other file and get a output like: user-name id contact-details The format of the two files is like follows: 1.user-name Tarun:143 Rahul:148 Neeraj:149 2.user-details Tarun:[email protected] Neeraj:[email protected] Rahul:[email protected] what I'm trying to get is like: Neeraj:149:[email protected] Rahul:148:[email protected] Tarun:143:[email protected]

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  • InfiniBand Enabled Diskless PXE Boot

    - by Neeraj Gupta
    If you ever need to bring up a computer with InfiniBand networking capabilities and diagnostic tools, without even going through any installation on its hard disk, then please read on. In this article, I am going to talk about how to boot a computer over the network using PXE and have IPoIB enabled. Of course, the computer must have a compatible InfiniBand Host Channel Adapter (HCA) installed and connected to your IB network already. [ Read More ]

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  • InfiniBand Enabled Diskless PXE Boot

    - by Neeraj Gupta
    When you want to bring up a compute server in your environment and need InfiniBand connectivity, usually you go through various installation steps. This could involve operating systems like Linux, followed by a compatible InfiniBand software distribution, associated dependencies and configurations. What if you just want to run some InfiniBand diagnostics or troubleshooting tools from a test machine ? What if something happened to your primary machine and while recovering in rescue mode, you also need access to your InfiniBand network ? Often times we use opensource community supported small Linux distributions but they don't come with required InfiniBand support and tools. In this weblog, I am going to provide instructions on how to add InfniBand support to a specific Linux image - Parted Magic.This is a free to use opensource Linux distro often used to recover or rescue machines. The distribution itself will not be changed at all. Yes, you heard it right ! I have built an InfiniBand Add-on package that will be passed to the default kernel and initrd to get this all working. Pr-requisites You will need to have have a PXE server ready on your ethernet based network. The compute server you are trying to PXE boot should have a compatible IB HCA and must be connected to an active IB network. Required Downloads Download the Parted Magic small distribution for PXE from Parted Magic website. Download InfiniBand PXE Add On package. Right Click and Download from here. Do not extract contents of this file. You need to use it as is. Prepare PXE Server Extract the contents of downloaded pmagic distribution into a temporary directory. Inside the directory structure, you will see pmagic directory containing two files - bzImage and initrd.img. Copy this directory in your TFTP server's root directory. This is usually /tftpboot unless you have a different setup. For Example: cp pmagic_pxe_2012_2_27_x86_64.zip /tmp cd /tmp unzip pmagic_pxe_2012_2_27_x86_64.zip cd pmagic_pxe_2012_2_27_x86_64 # ls -l total 12 drwxr-xr-x  3 root root 4096 Feb 27 15:48 boot drwxr-xr-x  2 root root 4096 Mar 17 22:19 pmagic cp -r pmagic /tftpboot As I mentioned earlier, we dont change anything to the default pmagic distro. Simply provide the add-on package via PXE append options. If you are using a menu based PXE server, then add an entry to your menu. For example /tftpboot/pxelinux.cfg/default can be appended with following section. LABEL Diskless Boot With InfiniBand Support MENU LABEL Diskless Boot With InfiniBand Support KERNEL pmagic/bzImage APPEND initrd=pmagic/initrd.img,pmagic/ib-pxe-addon.cgz edd=off load_ramdisk=1 prompt_ramdisk=0 rw vga=normal loglevel=9 max_loop=256 TEXT HELP * A Linux Image which can be used to PXE Boot w/ IB tools ENDTEXT Note: Keep the line starting with "APPEND" as a single line. If you use host specific files in pxelinux.cfg, then you can use that specific file to add the above mentioned entry. Boot Computer over PXE Now boot your desired compute machine over PXE. This does not have to be over InfiniBand. Just use your standard ethernet interface and network. If using menus, then pick the new entry that you created in previous section. Enable IPoIB After a few minutes, you will be booted into Parted Magic environment. Open a terminal session and see if InfiniBand is enabled. You can use commands like: ifconfig -a ibstat ibv_devices ibv_devinfo If you are connected to InfiniBand network with an active Subnet Manager, then your IB interfaces must have come online by now. You can proceed and assign IP address to them. This will enable you at IPoIB layer. Example InfiniBand Diagnostic Tools I have added several InfiniBand Diagnistic tools in this add-on. You can use from following list: ibstat, ibstatus, ibv_devinfo, ibv_devices perfquery, smpquery ibnetdiscover, iblinkinfo.pl ibhosts, ibswitches, ibnodes Wrap Up This concludes this weblog. Here we saw how to bring up a computer with IPoIB and InfiniBand diagnostic tools without installing anything on it. Its almost like running diskless !

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  • WAIT-VHUB ? Whats Going On ?

    - by Neeraj Gupta
    I know many of you have been working on Oracle's Exalogic and other Engineered Systems. With partitions enabled now, things have gone multi dimension. But its fun. Isn't it ? While you have some EoIB configurations together with InfiniBand partitions, the VNICs are not coming up and staying in WAIT-VHUB state ?  Chances are that you have forgot to add InfiniBand Gateway switches' Bridge-X port GUIDs to your partition. These must be added as FULL members for EoIB to work properly. VHUB means a virtual hub in EoIB. Bridge-x is the access point for hosts to work over EoIB so thats why it must be a full member in partition. Step 1: Find out the port GUIDs of your bridge-x devices in IB Gateway switch. # showgwports INTERNAL PORTS: --------------- Device   Port Portname  PeerPort PortGUID           LID    IBState  GWState --------------------------------------------------------------------------- Bridge-0  1   Bridge-0-1    4    0x0010e00c1b60c001 0x0002 Active   Up Bridge-0  2   Bridge-0-2    3    0x0010e00c1b60c002 0x0006 Active   Up Bridge-1  1   Bridge-1-1    2    0x0010e00c1b60c041 0x0026 Active   Up Bridge-1  2   Bridge-1-2    1    0x0010e00c1b60c042 0x002a Active   Up Step 2: Add these port GUIDs to the IB partition associated with EoIB. Login to master SM switch for this task. # smpartition start # smpartition add -pkey <PKey> -port <port GUID> -m full # smpartition commit Enjoy ! 

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  • Wireless not working with an Atheros AR9285

    - by Neeraj
    I recently installed Ubuntu 12.04 and found my wireless card is not detected by OS. I tired to detect it by network manager but still it is not get output of the required command: toor@Linux:~$ sudo lshw -class network *-network description: Ethernet interface product: AR8131 Gigabit Ethernet vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:03:00.0 logical name: eth0 version: c0 serial: f0:de:f1:9e:22:4d size: 100Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI duplex=full firmware=N/A ip=124.123.227.84 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:44 memory:f2400000-f243ffff ioport:2000(size=128) *-network UNCLAIMED description: Network controller product: AR9285 Wireless Network Adapter (PCI-Express) vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:04:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:f2500000-f250ffff and toor@Linux:~$ rfkill list all 0: ideapad_wlan: Wireless LAN Soft blocked: yes Hard blocked: no 1: ideapad_bluetooth: Bluetooth Soft blocked: yes Hard blocked: no Please let me know what more info is required to resolve it.

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  • How to run a service as a user who can't delete or update or create a file

    - by neeraj
    Mongodb is a web based console to try out Mongodb. I have created something similar to try out nodejs. In nodejs I am accepting user input and then I am performing eval on that command. Given the power of nodejs , someone from web console can create a file, delete files on the system or could execute 'rm -rf '. I was thinking will it be okay if I run node as a user called node. This user node will not have any privilege to write anything, create anything or update anything. The only access this user will have is read access. Will that work or that is too much of risk. What is a good strategy to handle such a situation?

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  • Distributed file systems

    - by Neeraj
    I need to implement a distributed storage system for a set of nodes(devices) connected in a mesh network. So what basically my design goals are: The storage system should be capable of handling dynamic entry and exit of nodes. Replication (for fault tolerance). For this i am thinking of using a Distributed file system. Every node could access data in the other nodes in a transparent manner. Are there some simple, easily pluggable opensource implementations? Thanks for your thoughts!

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  • How does operating system software maintains time clocks?

    - by Neeraj
    Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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  • Tricky compiler behavior

    - by Neeraj
    Simple java code snippet. It has three classes. After compiling the code please delete A.class and then execute the code. Code still runs, why its not checking whether the byte code of A exists or not? class A { static { System.out.println("In the class A"); } public A() { } } class B { private A a = null; static { System.out.println("In the class B"); } public B() { a = new A(); } } public class ExampleLinkage { static { System.out.println("In the class A"); } public ExampleLinkage(String str) { } public static void main(String args[]) { try { System.out.println("In the main method of ExampleLinkage"); Class.forName("com.bt.rtti.B"); } catch(Exception e) { e.printStackTrace(); } } }

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  • Cross Platform build

    - by Neeraj
    I have an application in which we use a hand-made build system.The reason for this is portability, the application should be portable on Linux/Mac/Windows. There are some port-specific files that are not updated by the deafult build system. What I do now is update the files manually or have a script do this. However I am thinking of switching to cross platform build system like cmake or scons. Are their associated problems wrt portability? Will it pay in long run? and if so what should be my choice "cmake", "scons" or some other(if any?). Thanks,

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  • feof() in C file handling

    - by Neeraj
    I am reading a binary file byte-by-byte,i need determine that whether or not eof has reached. feof() doesn't works as "eof is set only when a read request for non-existent byte is made". So, I can have my custom check_eof like: if ( fread(&byte,sizeof(byte),1,fp) != 1) { if(feof()) return true; } return false; But the problem is, in case when eof is not reached, my file pointer is moved a byte ahead. So a solution might be to use ftell() and then fseek() to get it to correct position. Another solution might be to buffer the byte ahead in some temporary storage. Any better solutions?

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  • gcc std=gnu++0x option

    - by Neeraj
    Hi everyone, I need to compile a C++ code that uses std=gnu++0x option to the g++ compiler in the Makefile.am , As this option is compatible only with gcc 4.3 and above, the build crashes on my machine where i have gcc 4.2. What are my alternatives ? I tried removing that option from the Makefile.am but that reports some other error. Do i need to install gcc 4.3 or above? How can I do it in ubuntu hardy through apt-get ? Thanks.

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  • How can I resume downloads in Perl?

    - by Neeraj
    I have a project that depends upon some other binaries to be downloaded from web at install time.For this what i do is: if ( file-present-in-src/) # skip that file else # use wget to download the file The problem with this approach is that when I interrupt a download in middle, and do invoke the script next time, the partially downloaded file is also skipped (which is not desired), also I want wget to resume the download of the partially downloaded file. How should I go about it: Possible Solutions I could think of: Let the file to be downloaded to some file say download_tmp. Move to original file if successful. Handle SIG{'INT'} to write proper cleanup code. But none of these could help resume the partial file download, Any insights?

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  • using macro defined in header files

    - by Neeraj
    I have a macro definition in header file like this: // header.h ARRAY_SZ(a) = ((int) sizeof(a)/sizeof(a[0])); This is defined in some header file, which includes some more header files. Now, i need to use this macro in some source file that has no other reason to include header.h or any other header files included in header.h, so should i redefine the macro in my source file or simply include the header file header.h. Will the latter approach affect the code size/compile time (I think yes), or runtime (i think no)? Your advice on this!

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  • ideas for a distributed cache proxy server

    - by Neeraj
    Hi everyone! I am implementing, a distributed cache proxy server.I have an idea of the HTTP and related stuff, so i am rather concentrating on the sub part "Distributed data storage". From some search on web i found that this could be done using Distributed Hash Tables(DHT). I was wondering if there exists some kind of library for this preferably in C/C++. Any better suggestions for the same will also be appreciated.

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  • How does operating system software maintains time clocks?

    - by Neeraj
    Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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  • Subversion: svn protocol with HTTP/HTTPS proxy

    - by Neeraj
    Hi all, I need to do a svn checkout,say svn checkout svn://XYZ.com/trunk. I am using the svn client from behind the proxy. I had accessed other repositries using the http protocol in past but with svn protocol,it fails with "Connection Refused", reason I think being the port not allowed by the proxy.Nonetheless, the HTTP protocol is not supported on the server. However, svn+ssh gets connected but it prompts for an account at that server which I don't have? Is there any way out other than requesting for an account? Note that I can't affect the settings of the proxy server.

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  • What is meant by porting an application X to a platform Y ?

    - by Neeraj
    Pretty clear from the title itself, what is meant by porting an application X to a platform Y? Say for example I have an application X running on some OS, say Y, What do I do to port this application to another OS say Z? Does this mean rewriting a new application A for Operating system Z that necessarily imitates the behavior of application X on Operating System Y. Please explain.

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  • Javascript - dynamically add input fields

    - by Neeraj
    Hi Guys, I have a code to add input fields dynamically in js. But the problem is if i add 3 fields or more and then browse a file(if the input field is file), the value of the field selected disappears. Can any one help Heres my code Thanks in advance. :) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>Untitled Document</title> <script type="text/javascript"> <!-- Begin /* This script and many more are available free online at The JavaScript Source!! http://javascript.internet.com Created by: Husay :: http://www.communitxt.net */ var arrInput = new Array(0); var arrInputValue = new Array(0); fields = 1; maxInput = 4; function addInput() { //arrInput.push(createInput(arrInput.length)); if(fields <= maxInput){ fields +=1; arrInput.push(arrInput.length); //arrInputValue.push(arrInputValue.length); arrInputValue.push(""); display(); } } function display() { document.getElementById('parah').innerHTML=""; for (intI=0;intI<arrInput.length;intI++) { document.getElementById('parah').innerHTML+=createInput(arrInput[intI], arrInputValue[intI]); } } function saveValue(intId,strValue) { arrInputValue[intId]=strValue; } function createInput(id,value) { return "<input type='file' id='test "+ id +"' onChange='javascript:saveValue("+ id +",this.value)' value='"+ value +"'><br>"; } function deleteInput() { if (arrInput.length > 0) { fields -=1; arrInput.pop(); arrInputValue.pop(); } display(); } // End --> </script> </head> <body> <a href="javascript:addInput()">Add more input field(s)</a><br> <a href="javascript:deleteInput()">Remove field(s)</a><br> <input type="file" /><br> <input type="file" /><br> <input type="file" /><br> <p id="parah"></p> </body> </html>

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  • customizing what files to keep under version control ? [svn]

    - by Neeraj
    Recently, I checked out a copy of a project, There were multiple source files and a manual makefile based build system. I did this svn status No output // meaning . is a working copy make // created a lot of *.o files svn status No change How come this is possible? This clearly suggests there be some wildcard way to customize the files under version control? How can I do that?s

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