Sailfishc

Download courses from learning sites with youtube-dl

You can download whole courses from an array of tutorial sites with the CLI tool youtube-dl. In the example further down I'm using my Pluralsight account to get videos from a course at their site. Here is a list of all supported sites that you can download from with this tool

The flags you have to supply may vary depending on which site you make a request to.

You can get a free 3 month trial to Pluralsight by signing up for free to Visual Studio Dev Essentials

Installation

Sailfishc

• Pre Sum (hash map)

  • 1. Two Sum
  • 15. 3Sum
  • 18. 4Sum
  • 410. Split Array Largest Sum
  • 560. Subarray Sum Equals K

• Calculation

Sailfishc

# problem: when presenting, I want to obscure
# my prompt to act like it's at root of file system 
# and be very basic with no git info, etc.

# solution: this theme lets you set a ENV to the path 
# of your presentation, which will help remove unneeded prompt
# features while in that path 

# oh-my-zsh theme for presenting demos
# based off the default rubbyrussell theme

Sailfishc

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

Sailfishc

#!/usr/bin/env bash

GEMS=$(cat <<EOF
childprocess-0.5.8.gem
ffi-1.9.10.gem
little-plugger-1.1.4.gem
micromachine-1.1.0.gem
multi_json-1.11.1.gem
net-ssh-2.9.2.gem
rest-client-1.6.9.gem

Sailfishc

# I you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH=/Users/biezhi/.dotfiles/zsh

# it'll load a random theme each time that oh-my-zsh is loaded.
# See https://github.com/robbyrussell/oh-my-zsh/wiki/Themes
#ZSH_THEME="robbyrussell"
#ZSH_THEME="ys"

Sailfishc

修改系统环境变量，以自如的切换多个版本的 jdk

vi ~/.bash_profile 并填写下文内容
source ~/.bash_profile // 刷新环境变量
java -version // 查看当前的 jdk 版本

需要填写的内容为：

Sailfishc

开源协作，为了规范，一般都是 fork 别人的仓库到自己帐号下，再提交pr，原始仓库一直保持更新，下面介绍如何保持自己fork之后的仓库与上游仓库同步。

下面以我 fork Blade 仓库为例

点击 fork 到自己帐号下，然后就可以在自己的帐号下 clone 相应的仓库

使用 git remote -v 查看当前的远程仓库地址，输出如下：

origin git@github.com:biezhi/blade.git (fetch)

Sailfishc

import java.awt.Color;  
import java.awt.Graphics2D;  
import java.awt.Image;  
import java.awt.Rectangle;
import java.awt.image.BufferedImage;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.net.URL;

Sailfishc

#!/bin/sh

#this is the prefix before the filename and can be anything you want
fileprefix='mysql_backup_';

#this is your mysql user - best to create a new mysql user called backup that has access to all databases
myuser='backup';

#your mysql password
mypass='s0mething$ecure123';