I am using Linux (2.6.39 kernel) and trying to find a way that would allow me to send volume increment/decrement commands from my host Linux OS to the Jabra device. I saw this functionality is possible both in Windows and Ubuntu, where controlling of the volume from the PC alters the Jabra volume. I am able t…
Tag: linux
Sockets – keeping a socket open after data transfer
I have written simple server/client programs, in which the client sends some hardcoded data in small chunks to the server program, which is waiting for the data so that it can print it to the terminal. In the client, I’m calling send() in a loop while there is more data to send, and on the server, IR…
Can I get symbol names from one .so and make another .so see it?
I’ve built zlib and libpng separately (what are these libs doesn’t matter), so I’ve got libz.so and libpng.so now. With dlopen() and dlsym() I get function pointers from libpng.so and use them, but the problem is that, since libpng depends on zlib, I get linker errors when libpng function ca…
Starting container as a non-root user vs starting as root and then downgrade to non-root
I am creating some Docker images and I am reading how others have been doing this. I have identified three general patterns when it comes to the user that runs processes inside the container: It uses root user for everything (spawned process(es) inside container run under root). It uses root user, does some s…
Can’t seem to setup my Django project properly
I was trying the official tutorial of Django because I want to learn it. I run Archlinux 4.10.11-1 64 bits. First, I created a folder named djangoapp where I set my virtual environment: $ virtualenv djangoapp I set my current directory to this folder, and then I activated it: $ source bin/activate And I insta…
How to change date format in linux/unix text file
I have sample.txt file in my linux system.all the data that is present in my file are in the following date format I want to convert all this date format in my sample.txt file to YYYY-MM-DD Format. Answer It’s quite simple with date -d, e.g. Input File Example Use/Output
How many ways will a process be terminated in Linux?
I’m reading Advanced Programming in the Unix Environment 3rd Edn, §7.3, Process Termination, the following statement make me confused: There are eight ways for a process to terminate. Normal termination occurs in five ways: Return from main Calling exit Calling _exit or _Exit Return of the last thread f…
Sed: select first part of price
Seems that my sed command is not working. I am trying to select the 2 in $2.99. However, no matter how I seem to type the regex, it will only give the .99 I want to select everything (every number) that is not the dollar sign up to the period. Any suggestions? echo “$2.99” | sed -e ‘s:^([^\$…
Linux Bash find files on user input with multiple -name clauses
I am trying to create small utility to collect log files from remote host by creating tar ball, for simplicity assume for now assume to just display list of files based on user input. This command works fine If i programmatically want to update -name clause based on the user input, say for example user input …
How to avoid double creating directories in /proc?
I’m writing a Linux kernel module, and I’d like to create a subdirectory, /proc/foo/, and then expose several artificial files inside it that will be generated on the fly by my module. I know I can use proc_mkdir to create the foo directory, but if it already exists dmesg will display a warning, a…