So, I use Linux, and I've been trying to find the time to get into game programming. I started out with Panda3d and had some pretty decent results and got a feel for many of the concepts in game programming. Not too long after that, I decided to step it up a notch and go to something more powerful and C or C++ based. I'm probably just r...
I have a couple variants of a program that I want to compare on performance. Both perform essentially the same task. One does it all in C and memory. The other calls an external utility and does file IO. How do I reliably compare them? 1) Getting "time on CPU" using "time" favors the second variant for calling system() and doing IO. ...
I'd like my program to read the cache line size of the CPU it's running on in C++. I know that this can't be done portably, so I will need a solution for Linux and another for Windows (Solutions for other systems could be usefull to others, so post them if you know them). For Linux I could read the content of /proc/cpuinfo and parse th...
Suppose I want to clone my hard drive (hda) to another drive (hdb) in the same computer. As I see it, there's two easy, rough and do-it-yourself ways: cat /dev/hda > /dev/hdb and dd if=/dev/hda of=/dev/hdb What technical reasons are there to that the latter is often/always said to be better than the former? under no circumstances tr...
What are my options? I tried MonoDevelop over a year ago but it was extremely buggy. Is the latest version stable a stable development environment? ...
I'm developing an embedded system which currently boots linux with console output on serial port 1 (using the console boot param from the boot loader). However, eventually we will be using this serial port. What is the best solution for the kernel console output? /dev/null? Can it be put on a pty somehow so that we could potentially ...
I need to scan uploaded files for viruses on a Linux server, but I'm not sure how to go about it. What are my options, if any? I'm also interested in how the scanners perform when multiple users send multiple files at the same time. ...
It's hard to search for D using Google, so I wasn't able to find a good answer: I have an old iBook G3 and I'd like to install Linux on it and use it to compile (and test) D programs written using Tango on it. Is this possible? Or hasn't anybody tried it, yet? After all the Mac port of GDC + Tango is broken in parts, too. ...
I have to rename a complete folder tree recursively so that no uppercase letter appears anywhere (it's C++ sourcecode, but that shouldn't matter). Bonus points for ignoring CVS and SVN control files/folders. Preferred way would be a shell script, since shell should be available at any Linux box. There were some valid arguments about det...
I needed to find all the files that contained a specific string pattern. The first solution that comes to mind is using find piped with xargs grep: find . -iname '*.py' | xargs grep -e 'YOUR_PATTERN' But if I need to find patterns that spans on more than one line, I'm stuck because vanilla grep can't find multiline patterns. ...
I need a way to represent a 2-D array (a dense matrix) of doubles in C++, with absolute minimum accessing overhead. I've done some timing on various linux/unix machines and gcc versions. An STL vector of vectors, declared as: vector<vector<double> > matrix(n,vector<double>(n)); and accessed through matrix[i][j] is between 5% and 100...
I've got a bunch of servers running this Linux app. I'd like for them to be able to generate a GUID with a low probability of collision. I'm sure I could just pull 128 bytes out of /dev/urandom and that would probably be fine, but is there a simple & easy way to generate a GUID that is more equivalent to the Win32 one? Specifically, o...
hi there :P can you suggest how to create a test enviroment to simulate various types of bandwidths and traffic in a web app ? Or maybe a program open source wich does this against localhost ? I think this is a very important subject when programming web apps but it is not a usual topic, the only way i can imagine to create such kind o...
I have an application that launches a webpage in the "current" browser when the user selects it. This part of my app works fine in the Windows version but I can't figure out how to do this in Linux build. Right now the Linux version is hardcoded for Firefox in a specific directory and runs a new instance of it each time and doesn't show...
What GNU/Linux command-line tool would I use for performing a search and replace on a file? Can the search text, and replacement, be specified in a regex format? ...
Concrete use case: In the Eclipse IDE, new 'plugins' can be added by copying a plugin's file(s) into the $ECLIPSE_HOME/plugins directory. However, I want to keep my original Eclipse installation 'clean' without additional plugins because I want to run this basic installation on its own at times. What is a way of avoiding having to copy...
I need to list all files whose names start with 'SomeLongString'. But the case of 'SomeLongString' can vary. How? I am using zsh, but a bash solution is also welcome. ...
I want to run a command as soon as a certain text appears in to a log file. How do I do it in bash? ...
Cron installation is vixie-cron /etc/cron.daily/rmspam.cron #!/bin/bash /usr/bin/rm /home/user/Maildir/.SPAM/cur/*; I Have this simple bash script that I want to add to a cron job (also includes spam learning commands before) but this part always fails with "File or directory not found" From what I figure is the metachar isn't being ...
So I have a daemon running on a linux system, and I want to have a record of its activities: a log. The question is, what is the "best" way to accomplish this? My first idea is to simply open a file and write to it. FILE* log = fopen("logfile.log", "w"); /* daemon works...needs to write to log */ fprintf(log, "foo%s\n", (char*)bar); /*...