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  • Shortening large CSV on debian

    - by Unkwntech
    I have a very large CSV file and I need to write an app that will parse it but using the 6GB file to test against is painful, is there a simple way to extract the first hundred or two lines without having to load the entire file into memory? The file resides on a Debian server.

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  • How to Implement Web Based Find File Database Text Search

    - by neversaint
    I have series of files like this: foo1.txt.gz foo2.txt.gz bar1.txt.gz ..etc.. and a tabular format files that describe the file foo1 - Explain foo1 foo2 - Explain foo2 bar1 - Explain bar1 ..etc.. What I want to do is to have a website with a simple search bar and allow people to type foo1 or just foo and finally return the gzipped file(s) and the explanation of the file(s). What's the best way to implement this. Sorry I am totally new in this area.

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  • How to implement/debug a sensor driver in ANDROID

    - by CVS-2600Hertz-wordpress-com
    Does anyone know of a walk-through or any examples of any code to setup sensors in android. I have the drivers available to me. Also i have implemented the sensors library as instructed in the Android-Reference along the sensors.h template. I am still unable to get any response at the apps level. How do i trace this issue? what might be the problem? Thanks in advance UPDATE: Jorgesys's link below points to a great APP to test if the sensor drivers are functioning properly or not. Not that i know they are not functioning, Any ideas of on where to dig??...

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  • How to maipulate the shell output in php

    - by Mirage
    I am trying to write php script which does some shell functions like reporting. So i am starting with diskusage report I want in following format drive path ------------total-size --------free-space Nothing else My script is $output = shell_exec('df -h -T'); echo "<pre>$output</pre>"; and its ouput is like below Filesystem Type Size Used Avail Use% Mounted on /dev/sda6 ext3 92G 6.6G 81G 8% / none devtmpfs 3.9G 216K 3.9G 1% /dev none tmpfs 4.0G 176K 4.0G 1% /dev/shm none tmpfs 4.0G 1.1M 4.0G 1% /var/run none tmpfs 4.0G 0 4.0G 0% /var/lock none tmpfs 4.0G 0 4.0G 0% /lib/init/rw /dev/sdb1 ext3 459G 232G 204G 54% /media/Server /dev/sdb2 fuseblk 466G 254G 212G 55% /media/BACKUPS /dev/sda5 fuseblk 738G 243G 495G 33% /media/virtual_machines How can i convert that ouput into my forn\matted output

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  • CVS in cmd/gui works only the third time I run a command.

    - by Somebody still uses you MS-DOS
    I'm using CVS in the command line. I'm in my repository folder. When I call a CVS command, I get... cvs [log aborted]: unrecognized auth response from localhost: -f [pserver aborted]: /opt/cvs/XXXXXX: no such repository ...2 times. The third time I run the command, it works with no problems. I tried to use a GUI client (CrossVC) and the same problem occurs. I tried inside gVim and Vim using VCSCommand and I'm having the same issues as well. I've tested with different times between each command, but I still have the same problems. I'm using a CVS configuration with stunnel. Why am I having problem with this setup? Why every time just the third time that I try to run the command that actually works?

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  • BASH: Checking for environment variables

    - by Hamza
    Hi folks, I am trying to check the value of an environment variable and depending on the value do certain things and it works fine as long as the variable is set. When it isn't though I get a whole bunch of errors (as BASH is trying to compare the string I specify with an undefined variable, I guess) I tried implementing an extra check to prevent it happening but no luck. The block of code I am using is: #!/bin/bash if [ -n $TESTVAR ] then if [ $TESTVAR == "x" ] then echo "foo" exit elif [ $TESTVAR == "y" ] then echo "bar" exit else echo "baz" exit fi else echo -e "TESTVAR not set\n" fi And this the output: $ export TESTVAR=x $ ./testenv.sh foo $ export TESTVAR=y $ ./testenv.sh bar $ export TESTVAR=q $ ./testenv.sh baz $ unset TESTVAR $ ./testenv.sh ./testenv.sh: line 5: [: ==: unary operator expected ./testenv.sh: line 9: [: ==: unary operator expected baz My question is, shouldn't 'unset TESTVAR' nullify it? It doesn't seem to be the case... Thanks.

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  • How can I get `find` to ignore .svn directories?

    - by John Kugelman
    I often use the find command to search through source code, delete files, whatever. Annoyingly, because Subversion stores duplicates of each file in its .svn/text-base/ directories my simple searches end up getting lots of duplicate results. For example, I want to recursively search for uint in multiple messages.h and messages.cpp files: # find -name 'messages.*' -exec grep -Iw uint {} + ./messages.cpp: Log::verbose << "Discarding out of date message: id " << uint(olderMessage.id) ./messages.cpp: Log::verbose << "Added to send queue: " << *message << ": id " << uint(preparedMessage->id) ./messages.cpp: Log::error << "Received message with invalid SHA-1 hash: id " << uint(incomingMessage.id) ./messages.cpp: Log::verbose << "Received " << *message << ": id " << uint(incomingMessage.id) ./messages.cpp: Log::verbose << "Sent message: id " << uint(preparedMessage->id) ./messages.cpp: Log::verbose << "Discarding unsent message: id " << uint(preparedMessage->id) ./messages.cpp: for (uint i = 0; i < 10 && !_stopThreads; ++i) { ./.svn/text-base/messages.cpp.svn-base: Log::verbose << "Discarding out of date message: id " << uint(olderMessage.id) ./.svn/text-base/messages.cpp.svn-base: Log::verbose << "Added to send queue: " << *message << ": id " << uint(preparedMessage->id) ./.svn/text-base/messages.cpp.svn-base: Log::error << "Received message with invalid SHA-1 hash: id " << uint(incomingMessage.id) ./.svn/text-base/messages.cpp.svn-base: Log::verbose << "Received " << *message << ": id " << uint(incomingMessage.id) ./.svn/text-base/messages.cpp.svn-base: Log::verbose << "Sent message: id " << uint(preparedMessage->id) ./.svn/text-base/messages.cpp.svn-base: Log::verbose << "Discarding unsent message: id " << uint(preparedMessage->id) ./.svn/text-base/messages.cpp.svn-base: for (uint i = 0; i < 10 && !_stopThreads; ++i) { ./virus/messages.cpp:void VsMessageProcessor::_progress(const string &fileName, uint scanCount) ./virus/messages.cpp:ProgressMessage::ProgressMessage(const string &fileName, uint scanCount) ./virus/messages.h: void _progress(const std::string &fileName, uint scanCount); ./virus/messages.h: ProgressMessage(const std::string &fileName, uint scanCount); ./virus/messages.h: uint _scanCount; ./virus/.svn/text-base/messages.cpp.svn-base:void VsMessageProcessor::_progress(const string &fileName, uint scanCount) ./virus/.svn/text-base/messages.cpp.svn-base:ProgressMessage::ProgressMessage(const string &fileName, uint scanCount) ./virus/.svn/text-base/messages.h.svn-base: void _progress(const std::string &fileName, uint scanCount); ./virus/.svn/text-base/messages.h.svn-base: ProgressMessage(const std::string &fileName, uint scanCount); ./virus/.svn/text-base/messages.h.svn-base: uint _scanCount; How can I tell find to ignore the .svn directories?

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  • problem in reading output of dd command using pipe

    - by Ummar
    I am developing an application, in which I want to redirect the output (progress information) of dd command to my C++ program, but it is not actually getting the output, here is the code FILE * progressInfo = popen("gzip -dc backup/backup.img.gz | pv -ptrbe -i 2 -s 2339876653 | dd of=/dev/sdb","r"); if(!progressInfo) { return -1; } char buf[1024]; while(fgets(buff, sizeof(buff),progressInfo)!=NULL) { std::cout << buff << endl; } but the problem is the progress information is not received in buff, and the output is continuously printed on terminal, and above program halts on while(fgets(buff, sizeof(buff),progressInfo)!=NULL), and as soon as the dd operation is completed, the very next line to loop block is executed. if anyone has any idea why the output is not returned to buff, and its continuously retuned on terminal?

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  • Convert HTML to RTF (HTML2RTF converter)

    - by Luca Matteis
    I'm looking for a simple HTML2RTF converter that I can use on my website which is using a *nix like Operating System. I haven't found anything on the internet, and was hoping the SO community would help me. PS: I don't want to implement this from scratch, and it doesn't really matter what language it's in, as long as I can run it on a *nix like system. If you guys have already some personalized implementation, the language preferred would be PHP.

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  • Grep in XML file

    - by nishant
    I have to find some patters from a XML file, but i am unable to do it. <field> <uniqueid>account </uniqueod> <tableid>afs</tableid> </field> <field> <uniqueid>address</uniqueod> <tableid>afs</tableid> </field> what i have to do is to search the entries between these two fields and redirect them to a file.txt.and output should be such that uniqueid tableid uniqueid tableid i.e. for each uniqueid tableid should be printed along with it. The entries can be different or same. Guys help me out...

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  • inode_operations , warning: initialization from incompatible pointer type

    - by djTeller
    Hi everyone, I'm trying to compile a simple Kernel program that read and write from a proc file. I'm trying to set permission to that file by overriding the permission fp in inode_operations struct (.permission) static int module_permission(struct inode *inode, int op, struct nameidata *foo) { . . . } static struct inode_operations Inode_Ops_4_Our_Proc_File = { .permission = module_permission, /* check for permissions */ }; Our_Proc_File->proc_iops = &Inode_Ops_4_Our_Proc_File; For some reason, when I compile this i get - warning: initialization from incompatible pointer type on the following line: .permission = module_permission, /* check for permissions */ Any idea how to solve this? Thanks!

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  • How to R/W hard disk when CPU is in Protect Mode?

    - by smwikipedia
    I am doing some OS experiment. Until now, all my code utilized the real mode BIOS interrupt to manipulate hard disk and floppy. But once my code enabled the Protect Mode of the CPU, all the real mode BIOS interrupt service routine won't be available. How could I R/W the hard disk and floppy? I have a feeling that I need to do some hardware drivers now. Am I right? Is this why an OS is so difficult to develop? I know that hardwares are all controlled by reading from and writing to certain control or data registers. For example, I know that the Command Block Registers of hard disk range from 0x1F0 to 0x1F7. But I am wondering whether the register addresses of so many different hardwares are the same on the PC platform? Or do I have to detect that before using them? How to detect them?? For any responses I present my deep appreciation.

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  • Tee a Pipe Asynchronously

    - by User1
    I would like to write the same information to two pipes, but I don't want to wait for the first pipe to read. Here's an example mkfifo one mkfifo two echo hi | tee one two & cat one & cat two & cat one does not start reading until cat two is run. Is there a way to make cat one run without waiting?

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  • How can I quickly sum all numbers in a file?

    - by Mark Roberts
    I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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  • selecting ppp of multiple interfaces

    - by Neeraj
    Hi everyone, I am currently having a hard time on getting the mobile broadband connection running on ubuntu 10.04(lucid lynx). I am using a USB modem and used wvdial to connect to the web It went like: Sending ATZ ... OK sending some more flags OK modem initialized connecting Local IP x.x.x.x Remote IP y.y.y.y Primary DNS z.z.z.z Secondary DNS a.a.a.a (Some more output) I tested this with invalid username to make sure it is really connected and i think it was connected as connection failed with invalid usernames. Now when I do a remote ping say 8.8.8.8 (Google DNS servers), the ping says unreachable I think this might be because the system may be using the ethernet to send packets which was indeed disconnected. So can anyone help me out with this. How can I select ppp as the interface to send packets or is there some other problem. A command line solution will be appreciated as my network manager applet doesnt works correctly. Any help is much much appreciated. -- thx

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  • Create File Speedily From Individual Column

    - by neversaint
    I have a data that looks like this: -1 1:-0.394668 2:-0.794872 3:-1 4:-0.871341 5:0.9365 6:0.75597 1 1:-0.463641 2:-0.897436 3:-1 4:-0.871341 5:0.44378 6:0.121824 1 1:-0.469432 2:-0.897436 3:-1 4:-0.871341 5:0.32668 6:0.302529 -1 1:-0.241547 2:-0.538462 3:-1 4:-0.871341 5:0.9994 6:0.987166 1 1:-0.757233 2:-0.948718 3:-1 4:-0.871341 5:-0.33904 6:0.915401 1 1:-0.167147 2:-0.589744 3:-1 4:-0.871341 5:0.95078 6:0.991566 The first column is class, and next 6 columns are features. I want to create 6 files for individual features. For example feat1_file.txt will contain -1 1:-0.394668 1 1:-0.463641 ... 1 1:-0.757233 1 1:-0.167147 feat2_file.txt will contain -1 2:-0.794872 ... 1 2:-0.589744 and so on. I have a Perl code that does this but it is horribly slow. Is there a way to do it faster? Typically the input files will contain 100K lines. use strict; use Data::Dumper; use Carp; my $input = $ARGV[0] || "myinput.txt"; my $INFILE_file_name = $input; # input file name open ( INFILE, '<', $INFILE_file_name ) or croak "$0 : failed to open input file $INFILE_file_name : $!\n"; my $out1 = $input."_feat_1.txt"; my $out2 = $input."_feat_2.txt"; my $out3 = $input."_feat_3.txt"; my $out4 = $input."_feat_4.txt"; my $out5 = $input."_feat_5.txt"; my $out6 = $input."_feat_6.txt"; unlink($out1); unlink($out2); unlink($out3); unlink($out4); unlink($out5); unlink($out6); print "$out1\n"; while ( <INFILE> ) { chomp; my @els = split(/\s+/,$_); my $lbl = $els[0]; my $OUTFILE1_file_name = $out1; # output file name open ( OUTFILE1, '>>', $OUTFILE1_file_name ) or croak "$0 : failed to open output file $OUTFILE1_file_name : $!\n"; print OUTFILE1 "$lbl $els[1]\n"; close ( OUTFILE1 ); # close output file my $OUTFILE2_file_name = $out2; # output file name open ( OUTFILE2, '>>', $OUTFILE2_file_name ) or croak "$0 : failed to open output file $OUTFILE2_file_name : $!\n"; print OUTFILE2 "$lbl $els[2]\n"; close ( OUTFILE2 ); # close output file # Etc.. until OUTFILE 6 } close (INFILE);

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  • Modify bash variables with sed

    - by Alexander Cska
    I am trying to modify a number of environmental variables containing predefined compiler flags. To do so, I tried using a bash loop that goes over all environmental variables listed with "env". for i in $(env | grep ipo | awk 'BEGIN {FS="="} ; { print $1 } ' ) do echo $(sed -e "s/-ipo/ / ; s/-axAVX/ /" <<< $i) done This is not working since the loop variable $i contains just the name of the environmental variable stored as a character string. I tried searching a method to convert a string into a variable but things started becoming unnecessary complicated. The basic problem is how to properly supply the environmental variable itself to sed. Any ideas how to properly modify my script are welcome. Thanks, Alex

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  • Dynamic loaded libraries and shared global symbols

    - by phlipsy
    Since I observed some strange behavior of global variables in my dynamically loaded libraries, I wrote the following test. At first we need a statically linked library: The header test.hpp #ifndef __BASE_HPP #define __BASE_HPP #include <iostream> class test { private: int value; public: test(int value) : value(value) { std::cout << "test::test(int) : value = " << value << std::endl; } ~test() { std::cout << "test::~test() : value = " << value << std::endl; } int get_value() const { return value; } void set_value(int new_value) { value = new_value; } }; extern test global_test; #endif // __BASE_HPP and the source test.cpp #include "base.hpp" test global_test = test(1); Then I wrote a dynamically loaded library: library.cpp #include "base.hpp" extern "C" { test* get_global_test() { return &global_test; } } and a client program loading this library: client.cpp #include <iostream> #include <dlfcn.h> #include "base.hpp" typedef test* get_global_test_t(); int main() { global_test.set_value(2); // global_test from libbase.a std::cout << "client: " << global_test.get_value() << std::endl; void* handle = dlopen("./liblibrary.so", RTLD_LAZY); if (handle == NULL) { std::cout << dlerror() << std::endl; return 1; } get_global_test_t* get_global_test = NULL; void* func = dlsym(handle, "get_global_test"); if (func == NULL) { std::cout << dlerror() << std::endl; return 1; } else get_global_test = reinterpret_cast<get_global_test_t*>(func); test* t = get_global_test(); // global_test from liblibrary.so std::cout << "liblibrary.so: " << t->get_value() << std::endl; std::cout << "client: " << global_test.get_value() << std::endl; dlclose(handle); return 0; } Now I compile the statically loaded library with g++ -Wall -g -c base.cpp ar rcs libbase.a base.o the dynamically loaded library g++ -Wall -g -fPIC -shared library.cpp libbase.a -o liblibrary.so and the client g++ -Wall -g -ldl client.cpp libbase.a -o client Now I observe: The client and the dynamically loaded library possess a different version of the variable global_test. But in my project I'm using cmake. The build script looks like this: CMAKE_MINIMUM_REQUIRED(VERSION 2.6) PROJECT(globaltest) ADD_LIBRARY(base STATIC base.cpp) ADD_LIBRARY(library MODULE library.cpp) TARGET_LINK_LIBRARIES(library base) ADD_EXECUTABLE(client client.cpp) TARGET_LINK_LIBRARIES(client base dl) analyzing the created makefiles I found that cmake builds the client with g++ -Wall -g -ldl -rdynamic client.cpp libbase.a -o client This ends up in a slightly different but fatal behavior: The global_test of the client and the dynamically loaded library are the same but will be destroyed two times at the end of the program. Am I using cmake in a wrong way? Is it possible that the client and the dynamically loaded library use the same global_test but without this double destruction problem?

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  • Parsing line with delimiter in Python

    - by neversaint
    I have lines of data which I want to parse. The data looks like this: a score=216 expect=1.05e-06 a score=180 expect=0.0394 What I want to do is to have a subroutine that parse them and return 2 values (score and expect) for each line. However this function of mine doesn't seem to work: def scoreEvalFromMaf(mafLines): for word in mafLines[0]: if word.startswith("score="): theScore = word.split('=')[1] theEval = word.split('=')[2] return [theScore, theEval] raise Exception("encountered an alignment without a score") Please advice what's the right way to do it?

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  • Getting error that the database is locked when refreshing the page

    - by acidzombie24
    The title is a joke. However it is serious as far as my app is concerned. I am running apache with mod mono and my asp.net app is using mono sqlite as its db. When i refresh the page twice i get the DB is locked error. The folder it is in is chmod 777. The webapp is creating sqlite.db and sqlite.db-journal but it doesnt seem to be able to delete the journal. i'm confused. What permissions do i need to set these? i tried precreating the files using 777 and had no luck.

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  • filter log file by defining regexes

    - by fmpdmb
    I have some HUGE log files (50Mb; ~500K lines) I need to start filtering some of the crap out of. The log files are being produced using log4j and have the basic pattern of: [log-level] date-time class etc, etc log-message I'm looking for a way that I can identify a regex start and regex end (or something similar) that will filter out the matching entries from the file so I can more easily wade through these massive files. I'm sure I could write a java program to accomplish this task, but I thought I'd ask the community before going down that path. Thanks in advance.

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