I am learning Linux daemon programming and write a simple daemon program. The issue is no data is written to the log file (/var/tmp/simpledeamon.log) though the file is successfully created (it's file size is zero from ls -l output). Could someone kindly point out the error in my program,The code is based on the Devin Watson's article at Here is the code:
// simplydaemon.cpp // A simple Linux daemon. #include <sys/types.h>
The below program is giving unpredictable and wrong output when I compile with g++ under Ubuntu OS , tried with the complier avilable with Ubuntu 8.04 and Ubuntu 10.04 LTS.
But it works fine when complied and ran Redhat g++ 3.4.6
I will have to code this. However I am lacking of time since I have too much to do. make a short code bash/dash to prompt the country with Zenity, then, get the PLS or m3u url and prompt with another zenity which radio to play. http://www.listenlive.eu/index.html
while doing socket/network programming, i am getting SSH-2.0-openssh4.7 error, instead of showing day time of server.general description i have Linux Box, with the help of putty i am connecting from windows system to Linux box,no problem in loging,after typing program, i am running the program with gcc. when typing ./a.out, it is showing SSH-2.0-openssh4.7, actually it should display daytime from linux box in both tcp and udp.
I'm looking for a program that will visualize anything that goes through my audio-output (in this case it's Spotify) and display it on the screen. Does this exist?
I've made a LED gadget, which can light up LED patterns. It connects to serial port with RS232 protocol and receives messages which contain desired patterns. My friend wrote a python program which generates patterns and writes them to terminal. Everything is fine this far. I've made a bash script to run this program:
What I don't understand is - how do I redirect it's output to ttyS0 so that my device could catch generated data?
I've heard that in Linux every data stream can be redirected anywhere with '>>' in bash script. How do I do that? Can I, dunno, write something like this: python gen.py >> ttyS0 in shell script?
Is there any way to select which output device a program uses? I notice many Ubuntu programs lack the choice to choose where the sound is outputted, for example Rhythmbox and Exaile.I have 3 sound outputs (Internal, PCI, HDMI) connected and I'd like to for example use the PCI card as default audio device but play music from Rhythmbox through the internal motherboard output.
I have a multithreaded program running. The threads are created by using pthread_create(). The ps shows a pid value for each thread in the process. The name of the thread is all the same as the parent process. I want to match the PID values in the ps output to the threads in my program. But when I used getpid() in each thread, the value I get is different from what ps shows. How do I match the pid value in ps output to the threads in my program.
I'm using Ubuntu and I'm programing with eclipse CDT. My goal is to execute a php file and read the output to my c++ program. To do so I thought I should use fork(), dup2() and execl. When in shell, the call "php myscript.php" worked just fine, but when in c++ I tried: execl("usr/bin/php", "php", "home/geiger/workspace/SemiServer/server_content/myscript.php", NULL); And it didn't work (the process wasn't terminated and I got no output). I tried different version of this call, like losing the "php" string and/or drop "home/geiger" from the path string, to no better result.
I've got a C program that I've added some 'printf' statements to monitor a couple of variables. When I run this program manually or from a script, the output is displayed on screen. However, I need to change various variables in the 'test.c' file, run 'make clean' and 'make' a few hundred thousand times. I'm using a script to read the variables in and then using sed to do in-place edits of the file. Unfortunately, with this amount of iteration, it is getting rather tired!
Anyway, I've created a script that is working as long I respond to prompts. I've tried the following to no avail: Code: /path/to/script > /tmp/output /path/to/script > /tmp/output 2>&1 /path/to/script | tee (no output even after adding the -a option) In my C program, I have the following 'printf' statement: Code: printf ("variable1: $s variable2: $s",var1,var2); What am I missing? I've worked with redirection before and it's always worked out fine, but this one plain stumps!
I have a program that writes to stdout. Is there a way that I can redirect the output to the linux diff command or do I have to write the output to a file and then compare that. For example I have a bunch of test input files for a program and the corresponding expected output in another set of files. And I'd like to do something like ./program < t1.input | diff t1.expected.
Can someone recommend a good app to monitor the OUTPUT of my soundcard? I don't just want to look at the VU meter of my music player - i actually want to see what the soundcard is outputting. Windows drivers for my soundcard (Audiophile 192) had this ability, but I'm not sure what software to use in Linux.
I have nine barcode scanners, each of whose input I want to send to a separate instantiation of a program I wrote. Each device shows up as /dev/hidraw_ (I'm using Ubuntu 10.4). The problem is that they all act as simple keyboard input, and I can't seem to redirect the output from one to a specific instance of my program. I've tried something like cat /dev/hidraw5 > ./myapp, and that doesn't work. I've tried actually opening the device in my program using open("/dev/hidraw5"), and it returns success, but subsequent reads don't do anything, and the scanner output is just printed to the console.
Is there already a program that reads multiple pipes or file descriptors and writes to the standard output (not splitting lines).Like cat, but reading all files simultaneously and preserving lines.It is needed to avoid coding of select/epoll loops or using multithreading in simple programs. Like "select loop for bash".
Can anyone tell me what the pros and cons are between heirloom-mailx vs mailutils? This is for ubuntu 10.04 LTS. AT this point my only purpose is to use the mail command line program to occasionally send log output to email aliases.
im trying to build a simple program for my C programming class, this is the source code
#include <stdio.h> int main() { int length, width, length, height, area, perimeter; perimeter = width + length + height; area = width * length + heigth;
[Code]...
i dont see any error (you might)but every time i run it it runs but after it asks me to input for the width i do it but it doesn't take me to the length, it just stays blank until i input another value in the same place for the width, it asks me for 4 inputs in total i don;t know why, and after i run it different times it gives me different values for the perimeter and are. how can I fix this?
As i am new to C++ i couldn't figure out how to input a file and make some change on the file and produce a output file. like this problem i have is.
"Program that processes an input file and produces an output file. The input file will contain lines of data, each containing two floating point numbers. The lines of the output file should contain the two numbers read and their average (with a '$' sign and 2 places after the decimal point)."
I have a file with something like** The total time for processing is 1245 seconds *when I doawk 'BEGIN{FS="The total time for processing"} {print $2 } ' fileI get correctly on screen 1245 seconds *but when I try to direct this to a file awk 'BEGIN{FS="The total time for processing"} {print $2 } ' file > outputthenoutput is empty ie the 1245 seconds * is not saved in ...Know why?
With the command "tail -300 /var/log/apache2/access.log | less" i can look in the log for the 300 latest visitors. and i wanted to ask if it's possiblle to get that command to run from a php file and if yes how ?
I am trying to learn C Programing and I'm having trouble on the output of my script. my script should count the characters in input but it doesn't give me any numbers.. here's my program code:
i am having problem with displaying my text. my text file is displayed in such a way and is called test.......
Code:
Sam Worthington ... Jake SullyasZoe Saldana ... NeytiriasSigourney Weaver ... Dr. Grace AugustineasStephen Lang ... Colonel Miles QuaritchasJoel Moore ... Norm Spellman (as Joel David Moore)asGiovanni Ribisi ... Parker SelfridgeasMichelle Rodriguez ... Trudy ChaconasLaz Alonso ... Tsu'teyasWes Studi ... EytukanasCCH Pounder ... MoatasDileep Rao ... Dr. Max PatelasMatt Gerald ... Corporal Lyle WainfleetasSean Anthony Moran ... Private FikeasJason Whyte ... Cryo Vault Med TechasScott Lawrence ... Venture Star Crew Chiefmore
What i am trying to do is for the program to read "as" and then from there start a new line... thus the expected output is...
Code:
Sam Worthington ... Jake Sully Zoe Saldana ... Neytiri Sigourney Weaver ... Dr. Grace Augustine
[code]....
I keep getting the error saying ...
Code:
editmain.cpp.98:error: initializer fails to determine size of 'str'
what does this mean, and how can i be able to format my file in the way i want?
is there a way in code to tell SDL to be directed to another desktop? This is so I can full screen debug rather than running in windowed mode. By other desktop I don't mean other machine just another workspace.*
* sorry don't know correct term for this it seems in Debian you have 4 you can select from the low right of the desktop, seems to be called desktop 1-2 in ubuntu.
I have an X11 GTK program, let's name it "foo".I would like to start it from command line, either from a text console, or from an ssh log-in. I want to run foo with Administrator privileges and in higher priority, and I need redirect standard output and standard error. Standard errors must go to syslog, except "libglade Warning" messages and empty line messages. Standard output is redirected to a file.I wrote a script, called "foo-start". The "foo" program must run continously, so the "foo-start" script should not wait for "foo"'s termination.The scrip actually looks likelike this: