tigercallme

Alternative naming schemes for AWS regions

Purpose

The intent is to define terse, standards-supported names for AWS regions.

Schemes

tigercallme

for range time.Tick(30 * time.Millisecond) {
	doSomthing()
}

//time.Tick()返回的是一个channel,每隔指定的时间会有数据从channel中出来，
//for range不仅能遍历map,slice,array还能取出channel中数据，range前面可以不用变量接收，
//所以可以简写成上面的形式。

tigercallme

// 很多时候我们需要让main函数不退出，让它在后台一直执行，例如：

func main() {
	for i := 0; i < 20; i++ { //启动20个协程处理消息队列中的消息
		c := consumer.New()
		go c.Start()
	}
	select {} // 阻塞
}

tigercallme

import time
from datetime import datetime, date

# 今天
datetime.datetime.today().date().isoformat()

# 通过日期对象生成时间戳
int(time.mktime(datetime.now().timetuple()))

# 通过时间戳生成日期对象，timestamp 的时间戳以秒为单位

tigercallme

# -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure(2) do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at

tigercallme

#!/usr/bin/env bash
set -e
set -x

[ "${DYNAMODB_HOME}" = "" ] && DYNAMODB_HOME=/opt/dynamodb
DYNAMODB_FILE=dynamodb_local_latest.tar.gz
DYNAMODB_URL=http://dynamodb-local.s3-website-us-west-2.amazonaws.com/${DYNAMODB_FILE}
DYNAMODB_JAR=DynamoDBLocal.jar
DYNAMODB_LOG=/var/log/dynamodb.log

tigercallme

man() {
	env \
		LESS_TERMCAP_mb=$(printf "\e[1;31m") \
		LESS_TERMCAP_md=$(printf "\e[1;31m") \
		LESS_TERMCAP_me=$(printf "\e[0m") \
		LESS_TERMCAP_se=$(printf "\e[0m") \
		LESS_TERMCAP_so=$(printf "\e[1;44;33m") \
		LESS_TERMCAP_ue=$(printf "\e[0m") \
		LESS_TERMCAP_us=$(printf "\e[1;32m") \
			man "$@"

tigercallme

package main

//round n up to a multiple of a.  a must be a power of 2.
func round(n, a int) int {
	return (n + a - 1) &^ (a - 1)
}

func main() {
	println(round(3, 4))
	println(round(5, 4))

tigercallme

package main

func rangeCopy() {
	x := [2]int{0x11, 0x22}

	for i, n := range x {
		x[0], x[1] = 0x100, 0x200
		println(i, n)
	}

tigercallme

#参考资料

• http://bbs.et8.net/bbs/showthread.php?t=568472
• http://www.ruanyifeng.com/blog/2011/09/curl.html

###下载单个文件，默认将输出打印到标准输出中(STDOUT)中

curl http://www.centos.org