Athanasius Tirza tirzasrwn

Setup Postgressql LInux Debian

sudo apt update
sudo apt install postgresql
sudo apt install postgresql-client

# Setting up new password
sudo passwd postgres

About

Convert file to ASCII. Some transfer protocol only support ASCII. We can still use it by converting our file into ASCII.

Tools

uuencode
uudecode
tar
gzip
gunzip

About

Linaro is an engineering organization that works on free and open-source software such as the Linux kernel, the GNU Compiler Collection (GCC), power management, graphics and multimedia interfaces for the ARM family of instruction sets and implementations thereof as well as for the Heterogeneous System Architecture (HSA). The company provides a collaborative engineering forum for companies to share engineering resources and funding to solve common problems on ARM software.

GNU Toolchain

Projects included in the GNU toolchain are:

GNU make: an automation tool for compilation and build
GNU Compiler Collection (GCC): a suite of compilers for several programming languages
GNU C Library (glibc): core C library including headers, libraries, and dynamic loader
GNU Binutils: a suite of tools including linker, assembler and other tools

Get data in real time using top

top -b -d 0.1 | grep "app-1\|app-2"

You will get data with somethin like this:

 1442 pi        20   0  141152  71724  19588 S  68.3   7.6   0:00.71 prompter_sample
 1442 pi        20   0  142176  72588  19964 S  53.4   7.7   0:01.26 prompter_sample
 1442 pi        20   0  142176  72588  19964 S   3.9   7.7   0:01.30 prompter_sample
 1442 pi        20   0  142176  72588  19964 S  10.6   7.7   0:01.41 prompter_sample

Client-side

ssh-keygen -t rsa -b 2048 # Enter twice
# Will create file ~/.ssh/id_rsa  ~/.ssh/id_rsa.pub
ssh-copy-id <server-user>@<server-ip> # This will ask you ssh-sever-password

# Test your work. It's should automate without password.
ssh <server-user>@<server-ip>

Server-side

http://liupeng0518.github.io/2019/09/09/docker/build/build%20busybox/
https://blog.csdn.net/qq_44045338/article/details/109368225
https://www.busybox.net/downloads/
https://stackoverflow.com/questions/49025932/failure-on-cross-compiling-busybox

make ARCH=arm CROSS_COMPILE=arm-unknown-linux-uclibcgnueabi- defconfig
make ARCH=arm CROSS_COMPILE=arm-unknown-linux-uclibcgnueabi- menuconfig
[Disable] Coreutils -> sync -> Enable -d and -f flags
[Disable] Linux System Utilities -> nsenter
[Disable] Linux System Utilities -> fallocate

main-source.
html-version.
pdf-version.

$ tree -d
+ MyDirectory/
| |
| + Folder_01/
| |
| + Folder_02/
| |
| + Folder_03/
|

	cmake_minimum_required(VERSION 3.10)

	project(run C)

	add_executable(run mqtt_example.c)
	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")

	target_link_libraries(run
	mosquitto
	)

	#include <string.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <openssl/evp.h>
	#include <openssl/aes.h>

	const unsigned char g_cKey[] = "thiskeyisverybad";
	const unsigned char g_iVec[] = "dontusethisinput";

	void encrypt(FILE ifp, FILE ofp)