Alexandre Dpbm

  ________   ___    _ ______ _____  ____   ____       _____ _   _  _____ _______       _      _      
 |  ____\ \ / / |  | |  ____|  __ \|  _ \ / __ \     |_   _| \ | |/ ____|__   __|/\   | |    | |     
 | |__   \ V /| |__| | |__  | |__) | |_) | |  | |______| | |  \| | (___    | |  /  \  | |    | |     
 |  __|   > < |  __  |  __| |  _  /|  _ <| |  | |______| | | . ` |\___ \   | | / /\ \ | |    | |     
 | |____ / . \| |  | | |____| | \ \| |_) | |__| |     _| |_| |\  |____) |  | |/ ____ \| |____| |____ 
 |______/_/ \_\_|  |_|______|_|  \_\____/ \____/     |_____|_| \_|_____/   |_/_/    \_\______|______|

NVME / ESP / XBOOTLDR / LUKS / SYSTEMD-BOOT / DRACUT

This guide is based on several documentations

Conventional Commit Messages

See how a minor change to your commit message style can make a difference.

git commit -m"<type>(<optional scope>): <description>" \
  -m"<optional body>" \
  -m"<optional footer>"

Key bindings

So ~/.tmux.conf overrides default key bindings for many action, to make them more reasonable, easy to recall and comforable to type.

Let's go through them.

If you are an iTerm2 user, third column describes the keybinding of similar "action" in iTerm2. It's possible to reuse very same keys you already get used to and tell iTerm2 to execute analogous tmux actions. See iTerm2 and tmux integration section below.

Clean Code

Aqui estão listadas algumas das principais recomendações do livro Clean Code - Robert C. Martin, 2008

2) Meaningful Names

Use Intention-Revealing names

Avoid Disinformation

Não adicionar o tipo da variável no seu nome.
Ex: accountList.
Não utilizar nomes parecidos.

32-bit ELF binary

how to assemble and link:

nasm -f elf32 -o <filename>.o <filename>.asm
ld -m elf_i386 -o <filename> <filename>.o

template code (hello world):

section .text
global _start

The i3-wm does not come with a keybinding to lock the screen or a preconfigured auto lockscreen. This gist describes how to setup both using i3lock and xautolock. i3lock is a minimalistic lockscreen and xautolock monitors mouse and keyboard activities to automatically lock the screen after a certain time of beiing inactive.

First get the tools if neccessary. E.g. sudo apt install i3lock xautolock.

To setup the keybinding Ctrl+Alt+l (last one is a lowercase L) to lock the screen append the following lines to the i3 configuration file located at ~/.config/i3/config.

# keybinding to lock screen

Installing and Basic Programs on MPI C

Installing MPI on Ubuntu

Run the following command on terminal

$ sudo apt-get install libcr-dev mpich2 mpich2-doc

Compiling MPI Programs

List of Linux networking tools

netstat (ss)

Displays contents of /proc/net files. It works with the Linux Network Subsystem, it will tell you what the status of ports are ie. open, closed, waiting, masquerade connections. It will also display various other things. It has many different options. Netstat (Network Statistic) command display connection info, routing table information etc. To displays routing table information use option as -r.

Sample output:

Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)    
tcp4 0 0 127.0.0.1.62132 127.0.0.1.http ESTABLISHED

	# SGR color constants
	# rene-d 2018

	class Colors:
	""" ANSI color codes """
	BLACK = "\033[0;30m"
	RED = "\033[0;31m"
	GREEN = "\033[0;32m"
	BROWN = "\033[0;33m"
	BLUE = "\033[0;34m"

	# Output a single frame from the video into an image file:
	ffmpeg -i input.mov -ss 00:00:14.435 -vframes 1 out.png

	# Output one image every second, named out1.png, out2.png, out3.png, etc.
	# The %01d dictates that the ordinal number of each output image will be formatted using 1 digits.
	ffmpeg -i input.mov -vf fps=1 out%d.png

	# Output one image every minute, named out001.jpg, out002.jpg, out003.jpg, etc.
	# The %02d dictates that the ordinal number of each output image will be formatted using 2 digits.
	ffmpeg -i input.mov -vf fps=1/60 out%02d.jpg