I am starting up with Python-Django in Ubuntu 18.04. I have python3 installed. python3 –version says Python 3.5.2 After installing Python, I installed Django as below: I also have Django installed. django-admin –version says 2.0.5 In my project, startproject worked successfully, but when I am tryi…
Wipe clean logfile on daily basis with logrotate
I want to clean a Docker container logs every day (no need to store/archive the data). I created a file called docker in /etc/logrotate.d and put the following inside: well, but it doesn’t work. So, obviously something in my logrotate configuration isn’t right. AFAIK, I don’t need to setup c…
Installing and running pypy on linux
I have been attempting to install and run pypy3 on a linux machine but am running into troubles. I have been using pypy on a mac but installed it using homebrew so didn’t encounter any of these troubles. I downloaded the most recent build and unpacked the tar file as described by their documentation. I …
Convert DLL from Windows to LINUX
I’m using the lastest DELPHI version 10.2.3 with LINUX support and I already managed to compile a console application using the platform LINUX 64 bit and execute this code on my UBUNTU client computer. Now I wanted to convert a larger project for LINUX. Question is now : for a exsting DLL which compiles…
GDB: breakpoint in linux built-in module fails
I am debugging linux kernel using two virtual machines connected via serial port. Target machine awaits connection from remote gdb, by inserting kgdbwait() and kgdboc=ttyS0,115200 in the correct entry in /boot/grub/grub.cfg. In Host machine Symbols are read and I am supposed to be able to put breakpoints on f…
How is the locale of a C program set to the “C” locale?
A C program inherits its locale environment variables when it starts up. This happens automatically. However, these variables do not automatically control the locale used by the library functions, because ANSI C says that all programs start by default in the standard “C” locale. I have read that a…
su and sudo not installed, but I need root permission to install them
I try to yum install package into docker container lambci/lambda:python3.6 I get the interactive console with but both su and sudo are not installed then I try to install anything with root permission is asked How to solve this evil circle ? Answer At least, you can try and run the image as root: That way, in…
Running variable string match against grep search?
I’ve defined the variables here to shorten the logic a little. The wget works fine (downloads the correct file) and grepping for tar.gz works in the wget.log The issue is the match to another file! Basically, if it’s on a blacklist I want it to skip! Answer Use && to test if both of the gr…
What are the relation and difference between a signal mask and a signal set?
From APUE Each process has a signal mask that defines the set of signals currently blocked from delivery to that process. We can think of this mask as having one bit for each possible signal. If the bit is on for a given signal, that signal is currently blocked. A process can examine and change its current sig…
Discard images from a group of similar images
I am generating images (thumbnails) from a video every 3 seconds. Now I need to discard/remove all the similar images. Is there a way I could this? I generate thumbnails using FFMPEG. I read about various image-diff solutions like given in this SO post, but I do not want to do this manually. How and what para…