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var mysql = require('mysql');

var pool = mysql.createPool('mysql://localhost');

inTransaction(pool, function(db, next) {
    db.query("DELETE * FROM stuff", function(err) {
        if (err) return next(err);

        db.query("INSERT INTO stuff VALUES (1,2,3)", function(err) {
            return next(err);

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import path from 'path'
import url from 'url'
import { app, crashReporter, BrowserWindow, Menu, globalShortcut } from 'electron'
const isDevelopment = (process.env.NODE_ENV === 'development')
let mainWindow = null
let forceQuit = false
var shouldQuit = app.makeSingleInstance(function(commandLine, workingDirectory) {
  // Someone tried to run a second instance, we should focus our window.
  if (mainWindow) { 
    if (mainWindow.isMinimized()) mainWindow.restore();

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HTML5 Canvas Zoom and Pan Image

Pure JavaScript Zoom and Pan, taken from http://phrogz.net/tmp/canvas_zoom_to_cursor.html

A Pen by TechSlides on CodePen.

License.

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#!/bin/sh

# Enable and disable HDMI output on the Raspberry Pi

is_off ()
{
	tvservice -s | grep "TV is off" >/dev/null
}

case $1 in

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Less Cheatsheet

less {filename}

Navigation
SPACE	forward one window
b	backward one window
d	forward half window

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In the name of God

Raspberry Pi Hardware ID

The following C++ code, shows how to get Raspberry Pi hardware ID(s) in various ways. You can concatenate the strings and calculate it's hash to take Raspberry Pi Fingerprint:

rpid.cpp:

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GCC compiler optimization for ARM-based systems

2017-03-03 fm4dd

The gcc compiler can optimize code by taking advantage of CPU specific features. Especially for ARM CPU's, this can have impact on application performance. ARM CPU's, even under the same architecture, could be implemented with different versions of floating point units (FPU). Utilizing full FPU potential improves performance of heavier operating systems such as full Linux distributions.

-mcpu, -march: Defining the CPU type and architecture

These flags can both be used to set the CPU type. Setting one or the other is sufficient.

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mmal_list_supported_encodings result

https://github.com/Terminus-IMRC/mmal_list_supported_encodings

vcgencmd version

Jul 26 2018 13:27:15 
Copyright (c) 2012 Broadcom
version 3d2fdb1dbb8700520f36a513effc130d4160ff62 (clean) (release)

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/**
 * Author Milan Divkovic
 *
 * You can control the motor with following commands:
 * 0: Disables the motor
 * 1: Enables the motor
 * + or -: Increase or decrease speed in respect to rotation direction
 */

#include <Arduino.h>

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libdir = /opt/opencv-4.1.0/lib
includedir = /opt/opencv-4.1.0/include/opencv4

Name: OpenCV
Description: OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library.
Version: 4.1.0
Libs: -L${libdir} -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_calib3d -lopencv_ccalib -lopencv_core -lopencv_datasets -lopencv_dnn_objdetect -lopencv_dnn -lopencv_dpm -lopencv_face -lopencv_features2d -lopencv_flann -lopencv_freetype -lopencv_fuzzy -lopencv_gapi -lopencv_hfs -lopencv_highgui -lopencv_imgcodecs -lopencv_img_hash -lopencv_imgproc -lopencv_line_descriptor -lopencv_ml -lopencv_objdetect -lopencv_optflow -lopencv_phase_unwrapping -lopencv_photo -lopencv_plot -lopencv_quality -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_stitching -lopencv_structured_light -lopencv_superres -lopencv_surface_matching -lopencv_text -lopencv_tracking -lopencv_videoio -lopencv_video -lopencv_videostab -lopencv_xfeatures2d -lopencv