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在本篇文档里，我们会使用 mruby 来作为编程语言演示如何在 CKB 实现一个最基础 UDT (User Defined Token) 合约

Dev Chain

首先我们需要启动一个本地的开发链来方便调试

配置矿工信息

我们先用 ckb-cli 命令生成一个新账户用于挖矿，运行 ckb-cli，然后输入

account new

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

Sometimes when working with Git you'd like to commit binary files.
But those files won't have clean comparisons with Git standard diff command.
Fortunately Git is a great tool that comes with a lot of possibilities…

MS Office

If, as a developer, you are under company constraints and must use MS Office,
you'll encounter some issues when trying to diff MS Office files.

Maybe you're asking yourself: what's the problem with that?

	# Turn on Notifications
	do shell script "defaults -currentHost write com.apple.notificationcenterui doNotDisturb -bool FALSE; defaults -currentHost delete com.apple.notificationcenterui doNotDisturbDate; osascript -e 'quit application \"NotificationCenter\" ' && killall usernoted" -- this set 'Do not disturb' to false in the pref

	# Show Desktop
	do shell script "defaults write com.apple.finder CreateDesktop -bool true; killall Finder"

	# Show all windows
	tell application "System Events"
	set visible of (every process) to true
	end tell



	def timeit(function):
	'''Decorator used for debugging. Prints the call and how long it took.'''
	def timed(args, *kwargs):
	ts = time.time()
	result = function(args, *kwargs)
	te = time.time()
	print("{0} ({1}, {2}) {3:.2} sec"
	.format(function.__name__, args, kwargs, te - ts))

	package main

	import (
	"time"
	"regexp"
	"bufio"
	"strconv"
	"fmt"
	"os"
	"errors"

	# WeChat aud file converter to wav files
	# Dependencies:
	# SILK audio codec decoder (available at https://github.com/gaozehua/SILKCodec)
	# ffmpeg
	#
	# By Gabriel B. Nunes ([email protected])
	# Adapted from another script by Nicodemo Gawronski ([email protected])
	#

	import os, argparse, subprocess

	package main

	import (
	"database/sql"
	"fmt"
	"net/url"
	"os"
	"reflect"
	"regexp"
	"strconv"