Category Archives: Uncategorized

Uncategorized but very important

Installing Microsoft Powershell on Ubuntu 24.04

I previously installed Powershell on CentOS. That time for Ubuntu I started from Microsoft repositories too and began to add Microsoft repository as well. I checked Microsoft repositories for Ubuntu. First I download prod.list info /etc/apt/sources.d directory: $ cd /etc/apt/sources.list.d/ $ sudo curl -O https://packages.microsoft.com/config/ubuntu/24.04/prod.list The prod.list looks like: $ cat /etc/apt/sources.list.d/prod.list deb [arch=amd64,arm64,armhf signed-by=/usr/share/keyrings/microsoft-prod.gpg]… Read More »

Split file to pieces in Linux and join it again

More than 10 years ago I created binary editor for Windows called xedit. I mentioned this tool already twice here. To find these posts put in search text box xedit and click on Search button. This tool does a lot of useful things with files and I still utilize it sometime. It is still available… Read More »

Run Linux file processing commands in Windows

Sometime it is necessary to compress or expand gz or tar files, print the sequences of printable characters from binary files or something similar. There are terminal commands which do such operations in Linux but in Windows usually it is necessary to download in install extra tool. However it is Windows Subsystem for Linux permits… Read More »

Statically Linking in golang to fix “version `GLIBC_2.34′ not found” execution error

It could happen that some executable build in one version of Linux operating system cannot be executed on other Linux OS. Statically linking may resolve this problem. In dynamic linking Go executable linked to shared object libraries with extension so similar as executables built from C language sources. Mainly system shared libraries were written in… Read More »

Windows Subsystem for Linux. Accessing files.

Linux distributions uses the Filesystem Hierarchy Standard (FHS) which defines the universal directory structure (like home, usr, bin, tmp and so on) and directory contents. To access to Windows c: drive from install WSL Linux distribution use /mnt/c directory. Let us create c:\Temp\ubuntu.txt file from WSL ubuntu 24.04 distribution: C:\>wsl -d Ubuntu-24.04 smoke29@MSI:/mnt/c$ sudo echo… Read More »

Windows Subsystem for Linux. Installation Linux Distributions.

Windows Subsystem for Linux (WSL) is new feature of Microsoft Windows 10 and 11. It look as light weight implementation of virtualization and alternative to Virtual box and/or HyperV. WSL is Windows feature with must be turned on. Go to Control Panel=>Programs and Features=>Turn Windows features on and off. Scroll down, find Windows Subsystem for… Read More »

Create and Deploy Smart Contract

The first post “Installing Ethereum Development tools: geth and truffle on Ubuntu 22” was about preparation of development and testing environment to create first simple smart contract application. Now let us create application itself. Again, everything on Ubuntu 22 machine. Create working directory and initialize new and empty Ethereum project: # mkdir -p /workspace/contract1 #… Read More »

ChatGTP client in c#

It is continuation of previous post “Ask ChatGPT to answer a question using curl command” but request to ChatGPT server is sent by c# code. The authentication secret key in example below has been revoked, so if you want copy-paste the code you need to use your own OpenAI authentication secret key or request new… Read More »

Ask ChatGPT to answer a question using curl command.

It is my beginning trail of ChatGPT (Generative pre-trained transformer) from OpenAI. It is possible to chat with ChatGPT there: https://chat.openai.com. However the main goal of this post to ask ChatGPT by sending raw HTTP request. To get access to OpenAI API you need to generate security key using this link: https://platform.openai.com/account/api-keys. The security key… Read More »

ssh Vulnerability DoS test

This test was created when I worked with CVE-2002-20001 vulnerability. The vulnerability is about diffie-hellman-group-exchange-sha256 key exchange algorithm with high computational complexity which is using long exponents that arguably make certain calculations unnecessarily expensive. To test the issue I created small bash script ddosssh.sh to simulate DDoS attack on ssh server using different key exchange… Read More »