linux

Terminate threads Gracefully in ACE

I have a question similar to This one . But I want to implement this in Linux, using ACE framework. What is the way to do this ...

linux tooling for starting as a net programmer

What are the linux developper tools to do the things i do with .NET in my windows environnement : I would like to port my client server application that runs under winform/nhibernate/sql server. Language c# Database SQL server ORM Nhibernate Source control SVN / Tortoise Unit testing Nunit Continuous integration Cruise Control Shoul...

Validity of GUI design patterns under linux

I am investigating a switch from windows to linux and i struggle to find samples of design patterns applied in this world. The application is a classic client server with detailed forms for each business entity. It will be taking user input, do some validation checks, a few calculations, and save them to database. It will also have list...

Error in requiring Sinatra gem

I'm having a hard time getting Sinatra running on my local setup, Ubuntu Karmic 9.10. The error getting thrown when I have require 'sinatra' is: NoMethodError: undefined method `[]' for nil:NilClass from /usr/local/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:891:in `compile' from /usr/local/lib/ruby/gems/1.8/gems/sinatra-1.0/...

Listing time every second as a Bash script

Hello all, first time here as I've finally started to learn programming. Anyway, I'm just trying to print the time in nanoseconds every second here, and I have this: #!/usr/bin/env bash while true; do date=(date +%N) ; echo $date ; sleep 1 ; done Now, that simply yields a string of date's, which isn't what I want. What is wrong? ...

How to store and echo multiple lines elegantly in bash?

I'm trying to capture a block of text into a variable, with newlines maintained, then echo it. However, the newlines don't seemed to be maintained when I am either capturing the text or displaying it. Any ideas regarding how I can accomplish this? Example: #!/bin/bash read -d '' my_var <<"BLOCK" this is a test BLOCK echo $my_var ...

symlink files newer than X age, then later remove symlink once file ages?

Hello everyone, i have a large number of files/folders coming in each day that are being sorted automatically to a wide variety of folders. I'm looking for a way to automatically find these files/folders and create symlinks to them all within an "incoming" folder. Searching for file age should be sufficient for finding the files, however...

How to grep lines having specific format.

I have got a file with following format. 1234, 'US', 'IN',...... 324, 'US', 'IN',...... ... ... 53434, 'UK', 'XX', .... ... ... 253, 'IN', 'UP',.... 253, 'IN', 'MH',.... Here I want to extract only those lines having 'IN' as 2nd keyword. i.e. 253, 'IN', 'UP',.... 253, 'IN', 'MH',.... Can any one please tell me a command to grep it...

How to make shell output redirect (>) write while script is still running?

I wrote a short script that never terminates. This script continuously generates output that I have to check on every now and then. I'm running it on a lab computer through SSH, and redirecting the output to a file in my public_html folder on that machine. python script.py > ~/public_html/results.txt However, the results don't show up...

C++: Help with cin difference between Linux and Windows

I have a Win32 console program that I wrote and it works fine. The program takes input from the user and performs some calculations and displays the output - standard stuff. For fun, I am trying to get the program to work on my Fedora box but I am running into an issue with clearing cin when the user inputs something that does not match ...

Monitor memory usage of child process

I have a Linux daemon that forks a few children and monitors them for crashes (restarting as needed). It will be great if the parent could monitor the memory usage of child processes - to detect memory leaks and restart child processes when the go beyond a certain size. How can I do this? ...

Moving from Windows to Ubuntu.

Hello there, I used to program in Windows with Microsoft Visual C++ and I need to make some of my portable programs (written in portable C++) to be cross-platform, or at least I can release a working version of my program for both Linux and Windows. I am total newcomer in Linux application development (and rarely use the OS itself). S...

php cli script hangs with no messages

Hi-- I've written a PHP script that runs via SSH and nohup, meant to process records from a database and do stuff with them (eg. process some images, update some rows). It works fine with small loads, up to maybe 10k records. I have some larger datasets that process around 40k records (not a lot, I realize, but it adds up to a lot of wo...

inotify delete_self when modifying and saving a file

I am running a small inotify script that sets up a watch on a file. Each time that file is edited and saved, the script notices that a DELETE_SELF event is triggered. Is that normal and if it is why? Shouldn't the inotify subsystem notice that the file still exists? ...

Can't Install libcurl PHP on Ubuntu Linux

I am trying to use the new facebook api and it requires libcurl PHP. I used sudo apt-get install php5-curl sudo apachectl -k restart And it didn't work. I get the same error and the phpinfo() page says nothing about libcurl. The source of this problem is probably that I built some of the tools from source (apache2, php), but the...

Forking with a listening socket

I'd like to make sure about the correctness of the way I try to use accept() on a socket. I know that in Linux it's safe to listen() on a socket, fork() N children and then recv() the packets in all of them without any synchronisation from the user side (the packets get more or less load-balanced between the children). But that's UDP. ...

How to generate one large dependency map for the whole project that builds with makefiles?

I have a gigantic project that is built using makefiles. Running make at the root of the project takes over 20 minutes when no files have changed (i.e. just traversing the project and checking for updated files). I'd like to create a dependency map that will tell me which directories I need to run 'make' in based on the file(s) changed....

Determine what version of Mono is running on linux?

Is there a command line I can run to determine what version of Mono I am running on Linux? I am using Ubuntu and I it is command line only (no X Windows installed). ...

Fingerprint SDK for Linux.

Hello all, Please tell me is there any SDK for fingerprints developed in Java or C/C++ that can be used on Linux platform? Regards. Mukul Gupta ...

Check linux distro name

Hi guys, I have to get linux distro name from python script. There is dist method in platform module: import platform platform.dist() But it returns >>> platform.dist() ('', '', '') Under my Arch Linux. Why? How can I get the name. p.s. I have to check whether the distro is debian-based. Upd: I found here python site, that dist...