alien18331

Install OpenCV 4.1.2 on Raspbian Buster

```bash
$ chmod +x *.sh
$ ./download-opencv.sh
$ ./install-deps.sh
$ ./build-opencv.sh
$ cd ~/opencv/opencv-4.1.2/build
$ sudo make install
```

alien18331

$sudo npm install -g --unsafe-perm node-red

alien18331

@echo off
title Activate Microsoft Office 2013 Volume for FREE!&cls&echo ============================================================================&echo #Project: Activating Microsoft software products for FREE without software&echo ============================================================================&echo.&echo #Supported products:&echo - Microsoft Office 2013 Standard Volume&echo - Microsoft Office 2013 Professional Plus Volume&echo.&echo.&(if exist "%ProgramFiles%\Microsoft Office\Office15\ospp.vbs" cd /d "%ProgramFiles%\Microsoft Office\Office15")&(if exist "%ProgramFiles(x86)%\Microsoft Office\Office15\ospp.vbs" cd /d "%ProgramFiles(x86)%\Microsoft Office\Office15")&echo.&echo ============================================================================&echo Activating your Office...&cscript //nologo ospp.vbs /unpkey:92CD4 >nul&cscript //nologo ospp.vbs /unpkey:GVGXT >nul&cscript //nologo ospp.vbs /inpkey:KBKQT-2NMXY-JJWGP-M62JB-92CD4 >nul&cscript //nologo ospp.vbs /inpkey:YC7DK-G2NP3-2QQC3-J6H88

alien18331

sudo modprobe vboxdrv
sudo apt update
sudo apt install --reinstall linux-headers-$(uname -r) virtualbox-dkms dkms

#Then reboot your system
sudo modprobe vboxdrv

#install VBoxLinuxAdditions.run
cd /media/ninjar/VBox_GAs_6.0.12
sudo ./VBoxLinuxAdditions.run

alien18331

install pip3
sudo apt install python3-pip

install common lib
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install libfreetype6-dev pkg-config -y
sudo apt-get install zlib1g-dev zip libjpeg8-dev libhdf5-dev -y
sudo apt-get install libssl-dev libffi-dev python3-dev -y
sudo apt-get install libhdf5-serial-dev hdf5-tools -y

alien18331

echo "# leptontest" >> README.md
git init
git add README.md

git config --global user.email "you@example.com"
git config --global user.name "Your Name"

git commit -m "first commit"
git remote add origin http://github.com:alien18331/leptontest.git
git push -u origin master

alien18331

#run & enter container  
> docker run -t -i ubuntu /bin/bash  

#commit (not inside the docker)  
1. check container id by cmd$ docker ps  
2. commit  
> sudo docker commit [container ID] [fileName.tar]  
  
#save image  

alien18331

virtualbox enable copy

sudo apt-get install virtualbox-guest-dkms

alien18331

#process status
//ps: show process
//-A: show all
//-e: function same as -A
//-f: show info.(UID,PPIP,C,STIME)
//    UID: UID group id
//    PID: process ID
//    PPID: father process ID
//    C: CPU usage
//    STIME: system start time

alien18331

downgrade Python 3.7 to 3.6 on RPI4
====================================

$ alias python3='/usr/bin/python3.4'
$ . ~/.bashrc
$ python3 --version # check version