ulinkwo

// Extracted from https://github.com/eoscafe/eoskeyio

const ecc = require('eosjs-ecc');
const eth = require('ethereumjs-util');

let ethereumPrivateKey = 'FILL THIS IN';

if(eth.isValidPrivate(Buffer.from(ethereumPrivateKey, 'hex'))) {
	let ethereumAddress = '0x' + eth.privateToAddress(Buffer.from(ethereumPrivateKey, 'hex')).toString('hex')
	let ethereumPublicKey = eth.privateToPublic(Buffer.from(ethereumPrivateKey, 'hex')).toString('hex')

ulinkwo

GPG - SSH setup

Generating the master key

Here we create the master key. We want only Certify capability: we use the master key only to create the subkeys, Sign - Encrypt - Authenticate capabilities will be assigned to the subkeys.

Run the following command to start the master key generation process. Select the set your own capabilities creation process (type 8)

  ▶ gpg --full-generate-key --expert

gpg (GnuPG) 2.2.9; Copyright (C) 2018 Free Software Foundation, Inc.

ulinkwo

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

1. Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
2. Create or import a key -- see below for https://keybase.io
3. Run gpg --list-secret-keys and look for sec, use the key ID for the next step
4. Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

ulinkwo

Signing is signing data (i.e. gpg --sign the_file)

Certification is signing a key (i.e. gpg --sign-key the_key)

Authentication is signing a challenge (like ssh does). The Authentication stuff can be used to log in to a machine using your GPG key.

The signature math is the same however you do it. The key usage flags are just to classify things.

ulinkwo

多窗口管理 我们可以使用多窗口，也可以使用多标签来操作。

分割当前的窗口可以使用：

cmd + d 水平分割窗口

cmd + shift + d 垂直分割窗口

cmd + [ 和 cmd + ]在分割窗口之间切换

ulinkwo

通过本机的81号端口访问测试服务器89的我的私人apache目录(端口为11063)

使用本地转发，在本机上输入

ssh -L 81:210.32.200.89:11063 suzie@210.32.200.89

这时候打开浏览器,输入地址127.0.0.1:81 我同时也试验了

ssh -L 81:127.0.0.1:11063 suzie@210.32.200.89

ssh -L 81:localhost:11063 suzie@210.32.200.89

ulinkwo

#!/usr/bin/env bash
 
# names of latest versions of each package
export NGINX_VERSION=1.11.3
export VERSION_PCRE=pcre-8.38
export VERSION_LIBRESSL=libressl-2.4.2
export VERSION_NGINX=nginx-$NGINX_VERSION
#export NPS_VERSION=1.9.32.10
#export VERSION_PAGESPEED=v${NPS_VERSION}-beta
 

ulinkwo

import java.util.Collection;
import java.util.List;
import java.util.ListIterator;

import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;

/**
 * Extension class between spring data commons and java.util.List that is 
 * required to get MyBatis to use it as a return value.

ulinkwo

class tomcat {
  $tomcat_url = "http://mirrors.axint.net/apache/tomcat/tomcat-7/v7.0.25/bin/apache-tomcat-7.0.25.tar.gz"
  $jdk_url = "http://download.oracle.com/otn-pub/java/jdk/6u25-b06/jdk-6u25-linux-x64.bin"

  Exec {
    path  => "${::path}",
  }
  group { "puppet":
    ensure  => present,
  }

ulinkwo

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs