I've written a shell script to soft-restart HAProxy (reverse proxy). Executing the script from the shell works. But I want a daemon to execute the script. That doens't work. system() returns 256. I have no clue what that might mean. #!/bin/sh # save previous state mv /home/haproxy/haproxy.cfg /home/haproxy/haproxy.cfg.old mv /var/run/ha...
I'm setting up a minimal chroot and want to avoid having sudo or su in it but still run the my processes as non-root. This is a bit of a trick as chroot requiers root. I could write a program that does this that would look something like: uid = LookupUser(args[username]) // no /etc/passwd in jail chroot(args[newroot]) cd("/") setuids(u...
I've got an Atmel AVR A90USBxxxx device that I have configured to "talk USB" via CDC. It's designed to take input from a Host computer, running Windows, Linux, or OS X. I'm under the impression that Linux and OS X will immediately recognize this CDC device, and with a simple .inf a Windows machine can be told my VID/PID should be opene...
Hello, I'm currently working on an embedded linux machine. Im trying to read a USB devices input stream but for some reason I dont have any such thing in my /dev directory. I would assume it would be something like /dev/ttyUSB01 or /dev/input/usb or something similar but it's not there. dmesg returns the following [ 195.863911] input: G...
I did a big oops, but the file is still open and in use. Following (http://stackoverflow.com/questions/1178593/link-to-a-specific-inode), copying from the /proc/###/fd/### to a new file is not useful because: the file is changing The filesize is 40G and the disk is full (150MB free) I am attempting to relink it to the filesystem (u...
I want to change the read only attribute from a file when I save it with :w! in vim. How do I do it? (I don't mind if I have to call an external script). I'm using Linux. I know I can use an external script using this command: autocmd BufWrite /tmp/* !sh /tmp/script.sh. So, I would like to call a chmod command when :w! is invoked: the ...
Hi, Can we open a new terminal tab or window from the existing terminal using a makefile or some c file. If yes how? Thanks in advance for replying. P.S. I want to do this because first in the terminal I want to run the server file then I want to open the new terminal and there run the file for the client. From the second terminal I ...
Sometimes I have to run a command many times in succession, for example to see if a service has started, and it becomes tedious to move my hands away from my normal typing position to press the Up Arrow and Enter keys repeatedly. Is there a way to run the previous command without the Up Arrow and Enter keys, perhaps with an elaborate she...
Hi, I would like to understand the values I get from read command in console. Are these outputs combinations of some keys? F2 ^[OQ F3 ^[OR F4 ^[OS ESC ^[ My problem is that I use special 128 keys keyboard that is programmed for specific software. I need to send these "keys" into this software using code below. Don't be confuse...
So I want a way to set chmod 755 to /opt/lampp/htdocs and all of its content including subfolders and files, and If I create a new folder or file the chmod of that should be also 755. chmod 75 /opt/lampp/htdocs works but only for this folder :| ...
Previous Question just to understand what I'm doing: How to set chmod for a folder and all of its subfolders and files in Linux Ubuntu Terminal? So if I change the chmod to 755 for chmod 75 /opt/lampp/htdocs and I restart the system I want the files to be in chmod 755. ...
Hi- I compile this program: #include <stdio.h> int main() { printf("Hello World!"); return 0; } With this command: gcc -c "hello.c" -o hello And when I try to execute hello, I get bash: ./hello: Permission denied Because the permissions are -rw-r--r-- 1 nathan nathan 856 2010-09-17 23:49 hello For some reaso...
I have a .a file from which I want to get architecture information. Running file myFile.a results in file.a: current ar archive. How can I get more information on what architecture the file contains? ...
When I created my own shell, I am not able to execute cd command which I am able to do in the Linux shell. Why is that? ...
Possible Duplicate: What are the thread limitations when working on Linux compared to processes for network/IO-bound apps? What is meant by context switches in threads or processes ? Also which is better : Threads or Processes ? I mean which is more space efficient and which is more time efficient ? ...
I use a debugging script that runs several related processes in succession with the debugger. I'm currently using -x to execute several commands automatically (such as run). How can I make gdb quit automatically when the debugged process successfully terminates? Adding a quit command to the command file will cause that command to be hand...
Hi, I think I'm having problems using PHP sessions because I've got cPanel installed on the same server and I believe it has additional security in place that prevents write access to /tmp I can set a new folder, but am unsure what permissions / owners should this folder have. Also where should it ideally be located? ...
This is not essential for my programs, but merely out of curiosity. Is it possible to, preferably using gcc, compile a 'fat' binary for Linux including multiple architectures such as combinations of amd64, i386, lpia and powerpc? ...
Sometimes when I type a command in bash, I mistakenly type in the \ character at the end, as it is close to the Enter key. Whenever I do this, I get a prompt on the next line, like this: >_ The same output is produced when the ` character is used. What exactly does this \ do to the command? Are there other characters (besides \ an...
I read that the executables for the commands issued using exec() calls are supposed to be stored in directories that are part of the PATH variable. Accordingly, I found the executables for ls, chmod, grep, cat in /bin. However, I could not find the executable for cd. Where is it located? ...