I was trying to see if SIGSEGV signal hander could help to deal with unhandled exception of C++, I experiment it: $ g++ -g h.cpp -rdynamic && ./a.out terminate called after throwing an instance of ‘int’ Aborted (Core dump) Well, the program doesn’t print crash call stack back trace a…
Bash scripting check condition
I’m new to bash scripting and trying to write the following simple And this works as expected. But if I delete echo “some string’ it prints nothing: Why? Why does deleting echo some_string right after the condition checking breaks the function? Answer It is because the if-condition is execut…
How to cross-platform compile on windows for linux using gcc?
My aim is to create cross-platform C++ python modules. I’m usingCyther (cross-platform The Cross-Platform Cython/Python Compiler). Cyther uses GCC to compile modules and gives the user the ability to add GCC command-line args. So, I need run compiler on Windows, but compile for Linux. What args I must p…
How to map buttons in html to running an executable file
This is my html code. I’d link to map those buttons to 2 executable files to switch on and off led in wandboard. How will i do it? Answer According to your comment the LED is connected to the Server while you try toggle it from a client. Since the HTML Page you send to the client is then rendered
PHP hang issue with passthru()/system() call and output buffering
I do have a strange problem. I’m trying to get around output buffering in PHP to run system() calls and get instant output. It works very well, but for some strange reason, the ping command on “test.de” isn’t presenting instant output as the ping on google.de does. I do see the first l…
Calling Matlab on a linux based Cluster: matlab sessions stops before m file is completly executed
i’m running a bash script that submits some pbs Jobs on a Linux based Cluster multiple times. each Submission calls Matlab, reads some data, performs calculations, and writes the results back to my Directory. This process works fine without one exception. For some calculations the m-file starts, loads e…
Cython standalone executable on ubuntu
I want my cython program to be standalone executable on linux, not to be imported. After cython –embed i got a c file,now how can i make it executable? Answer I guess you have to compile the .c file you have obtained. Assuming you are using python 3.5 and don’t have to link to other libraries than…
How/where to provide sudo password for Vagrant shell provisioners?
I am trying to build a Vagrant box (CentOS) that will be provisioned by an install.sh shell script. This script will do several things, the first of which, involves creating the correct directory structure under /opt so that my service can be installed there and do other things, like writing logs there, as we…
How To Avoid SIGCHLD error In Bash Script That Uses GNU Parallel
I’m running a script.sh in a loop. The script contains a parallel wget command. I’m getting the following error: The loop looks like this: And the line that is causing the error looks like this (omitting options and settings): Research: I’m not an expert with GNU Parallel, but the script see…
Check architecture for Linux and Mac
I’m trying to get the architecture of the computer executing my software, and so far it is working nice on Windows, but it fails on Linux and OSX. Let me show my current code: Linux and Mac always return “Processor is 32-bit”, so I guess that those environment variables are unused outside Wi…