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• strange error in running executable files (linux)

  - by Akhil

  I try to run an executable file on newly installed Ubuntu and I get this strange error ./hadoop hadoop : Not a directoryh hadoop hadoop command not found the first error says "directoryh", what is the reason for these messages

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• Can class of linux device be NULL?

  - by Basilevs

  Can I pass NULL pointer to the first argument of device_create function? I'm using device_create() to create character device file in sysfs. This file don't represent any physical device (it is used to provide an access to a set of devices connected to various buses). What class should I use with device_create() to create such a file?

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• linux ps aux command

  - by lakshmipathi

  How obtain the running process with absolute path name from ps command 13598 ? Ssl 0:00 /opt/something --run-id 2 -n /home/laks/f1 -l l.log I need the output as - /opt/something --run-id 2 -n /home/laks/f1 -l l.log

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• How to archive old revisions from Apache SVN on linux server

  - by user1260729

  I have a site through which user can write their own Screenplays. This screenplays are saved in the form of revisions. Apache SVN has been installed. I want to save only the last 5 revisions for every user's document. But the problem is on the backend the all the revisions are stored in one folder called "Docsrepo" and its classified as 1000 revisions in 1 folder. and like this it has 234 folders. Meaning 234*1000 revisions. Now I want to archive all of this revision to keep only the last 5 revisions of each document. How do i do that?

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• Linux / C++: Get Internet IP Address (not local computer's IP)

  - by Levo

  How can I programmatically get the Internet IP address? 1) If the computer is directly connected to the Internet using a USB modem. 2) If the computer is connected to the internet via another computer or a modem/router. I there a way to do both? P.S. This link gives exactly the Internet IP, but how can I use it in my program?

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• Linux apache developing configuration

  - by Jeffrey Vandenborne

  Recenly reinstalled my system, and came to a point where I need apache and php. I've been searching a long time, but I can't figure out how to configure apache the best way for a developer computer. The plan is simple, I want to install apache 2 + mysql server so I can develop some php website. I don't want to install lamp though, just the apache2, php5 and mysql. The problem that I've been looking an answer for is the permissions on the /var/www/ folder. I've tried making it my folder using the chown command, followed by a chmod -R 755 /var/www. Most things work then, but fwrite for example won't work, because I need to give write permissions to everyone, unless I change my global umask to 000 I'm not sure what I can do. In short: I want to install apache2, php5, mysql-server without using lamp, but configured in a way so I can open up netbeans, start a project with root in /var/www/, and run every single function without permission faults. Does anyone have experiences or workarounds to this? Extra: OS: Ubuntu 10.04 ARCH: x86_64

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• Tools for displaying text, powerpoint style, in linux

  - by Will Mc

  I have a problem where I need a way to display a repeating series of "images" on a computer monitor. Specifically, given a series of text files, I'd like a way to display the contents of said files on a screen in a way much like a powerpoint would. My current thoughts are to find some tool that will take in a text file of some format, and then output an image which contains the text from the file. Then I'd put it in a directory and have some Slideshow program continuously go between the images in that directory. It's a very hacky solution, obviously. So, does anyone know of tools that would do such a thing? Or is there a better way to do this? I've looked into the library libgd2, but it doesn't seem to support text-wrapping for images, which is something I'd need. Thanks!

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• Which way to go in Linux 3D programming?

  - by Tek

  I'm looking for some answers for a project I'm thinking of. I've searched and from what I understand (correct me if I'm wrong) the only way the program I want to make will work is through 3D application. Let me explain. I plan to make a studio production program but it's unique in the fact that I want to be able to make it fluid. Let me explain. Imagine Microsoft's Surface program where you're able to touch and drag pictures across the screen. Instead of pictures I want them to be sound samples (wavs,mp3,etc). Of course instead the input will be with the mouse but if I ever do finish the project I would totally add touch screen input compatibility! Anyway, I'm guessing there's "physics" to do with it which is why I'm thinking that even though it'll be a 2D application I'll need to code it in a 3D environment. Assuming that I'm correct in how I want to approach my project, where can I start learning about 3D programming? I actually come from PHP programming which will make C++ easier for me to learn. But I don't even know where to start. If I'm not wrong OpenGL is the most up to date API as far as I know. Anyway, please give me your insights guys. I could really use some guidance here since I could totally be wrong in everything that I wrote :)

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• Linux program - reverse highlighted text

  - by Oren

  I want to develop a program that will run on the background of my Ubuntu 12.04 so when some text is selected in some textbox of any running program and some key-combination is pressed (like ctrl-F12), the text will be cut, reversed, and pasted in the same place. I know some programs that do it on windows. It is useful in some programs and web-pages that do not support right-to-left languages like arabic and hebrew - the letters are printed from left to right so the text becomes reversed. More specifically I need it in Prezi that has this kind of bug in their embedded flash editor (I thought about writing a chrome-plugin, but I don't think such plugin can manipulate the selected text inside a flash objects). Do you know if such a program exist? Where should I start reading in order to develop a program with such capabilities (manipulate selected text in other programs)? Thanks

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• Linux - Bash Redirect a String to a file

  - by user3502786

  I wrote a simple script that is reading the file content and incrementing a a number inside this file, then i'm holding the change using awk, when i'm trying ro redirect the new String using '' the whole string is redirected in one line and not like the original was which is 4 lines. #!/bin/bash -x # This script is for Incrementing build numbers path=/home/RND/abrodov file=tst.txt tst=`cat $path/$file` printf "this is the content of the file before incrementing: \n $tst" newexpr=`awk '/^Build Number/{$4=$4+1;}1' /home/RND/abrodov/tst.txt` printf "\n the new content \n $newexpr" echo $newexpr > $path/$file This is the original file before running the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 22 This is the content after i used the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 23 I'm trying to figure out how can i redirect the text in the original format which is 4 lines.

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• linux cpu usage

  - by davidbobo

  I am working on unix. I want to knwo the current cpu usage of a process. I understood that ps give the average of cpu used till the process is up - it is not the current usage. Is there a way to print only the cpu from the top command without 10 more parameters and headers? I know how to do it with awk - this is not the way i want to do it. top -p 20705 -bc -n 1 | tail -n 2 | awk '{ print $9}' | head -n 1 If there is another simple way to do it, not reading /proc/stat... If there is a simple way doing it from c++, it is also ok.

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• Programming CLI Commands in Program [C / LINUX]

  - by Blackbinary

  I am attempting to make a program in C which presents a GUI and allows the user to select from a list of applications, which to install on the computer. I can manage the gui, but I've never been taught how to actually issue command line commands. I know with bash its just apt-get install firefox for example, but how do I do such a thing with C? i.e. on click, the program runs 'apt-get install The other problem is I'm not familiar with the proper name for this interaction, so it is hard to search. Thanks for the help

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• Program visible to Linux as normal directory

  - by Xam

  I'm trying to write program to work as programmable directory, in other words: User, or other systems open that directory and read/write files or dirs. I try to create program to cache most used files in memory (less I/O to HDD), but right now I don't know how to achive that. There are probably some docs about this but I can't find them. I know that there is FUSE, NFS and others, but reading their source is quite difficult. If any one has info about implementation in C lang I'll be very grateful. Sorry for my English..

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• script to sum all numbers in a file (linux)

  - 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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• linux inotify - determine users for the triggered events

  - by hyperboreean

  I am trying to figure out how to determine the user which triggered a specific event when monitoring some files with inotify. Is that even possible? Does the inotify_event structure has something like this?

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• Restricting access to a subdirectory on linux

  - by David

  I'm looking for a way to make a directory accessible only to its parent directories. That is, suppose you have two directories, A and B, at the same level in the file hierarchy. Now suppose that you have a directory A' which is a subdirectory of A. I'd like to enforce that A is able to access the contents of A' but B is not.

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• Embedded systems linux

  - by bhaskaragr29

  I want to make final year project so i want a two way interface device one connect to server and other connect to ouput display device..like television. whats are the rquirements i need....and how do i this.

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• linux (centos) privilege to copy file

  - by vick

  I need some help with priviligies in centos I have a file in home/admin/public_html/generate.php that I want to do some file copy with using php copy function When I set the file to chown admin:admin generate.php I can access the file but I cannot execute the php copy command because I don't have the proper rights. When I set the file to root:root generate.php I cant access the file beacuse its under admin user folder home/admin/public_html/generate.php how do I solve please, thankful for any help. Bottom line is that I want my generate.php which is owned by admin:admin to be able to copy files from sources outside its home dir and to other home dirs I am using CENTOS

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• Linux Sendmail Same username multiple domains

  - by Dev Jadeja

  I have configure my sendmail for multiple domains by creating username like [email protected] [email protected] [email protected] in passwd file Now I added entry in file /etc/mail/virtusetable like [email protected] sales\@domain1.com [email protected] sales\@domain2.com [email protected] sales\@domain3.com So when configuring the email client you provide your username as [email protected],[email protected] etc. I tested with webmail and outlook it works. Is this the best way to do it ?.Do i need to put the entry in any there file like genericstable or alias table?

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• Filtering Linux command output

  - by Raajkumar

  Hi, I need to get a row based on column value just like querying a database. I have a command output like this, Name ID Mem VCPUs State Time(s) Domain-0 0 15485 16 r----- 1779042.1 prime95-01 512 1 -b---- 61.9 Here I need to list only those rows where state is "r". Something like this, Domain-0 0 15485 16 r----- 1779042.1 I have tried using "grep" and "awk" but still I am not able to succeed. Please help me on this issue. Regards, Raaj

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• linux inotify - determine users for the events

  - by hyperboreean

  I am trying to figure out how to determine the user which triggered a specific event when monitoring some files with inotify. Is that even possible? Does the inotify_event has something like this?

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• GUI/TUI linux library

  - by Penz

  Is there any UI library that can be to build both a text user interface (ncurses) and graphical user interface (GTK? QT?) from the same source? I know that debconf can be used with various frontends, I would like to build something similar but programmable.

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• new items on GRUB screen in ubuntu/linux

  - by artsince

  I regularly update my ubuntu (10.04), and new minor versions keep accumulating on the GRUB screen. Right now I have 5 different versions listed on the GRUB, even though I always select the latest version to work with. Am I supposed to do anything to get rid of the old version references? Do these old versions affect disk space/performance?

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• read from file after calling lseek64 - Linux

  - by rursw1

  Hi, I'm trying to read a large file ( 2.0 GB). The seeking is done by lseek64, then I tried to read using read(fileHandle, buffer, bufferLength)\ pread64(fileHandle, buffer, bufferLength, offset) - but both return with -1. What could it be? Thanks in advance!

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• Porting Windows C++ to Standard (Linux) C++ - WSAGetLastError()

  - by Donal Rafferty

  I am currently porting some Windows mobile C++ code to standard C++. So I am trying to find alternatives for windows specific functions. I have had very little luck in finding a standard C++ function that can help me replace the WSAGetLastError() windows specific function. WSAGetLastError() returns error numbers for errors that occur with sockets in windows. So I was wondering if anyone was aware of a way to replace this function in standard c++? A way to get different error numbers for different outcomes of connecting/dissconection a socket would be sufficent.

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