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日常 | Nichijou
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<h1>日常</h1>
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<a href="/2017/01/30/music-sheet/">
<h2 class="post-title">
五线谱入门知识
</h2>
<h3 class="post-subtitle">
不要抱任何期望 真的仅仅是入门
</h3>
<div class="post-content-preview">
五线谱从理论上可以从任何乐器入手，但是选择钢琴应该是比较容易和传统的一种。所以就讲讲钢琴相关（其实是只有钢琴的书啊 →_→）。
标准的钢琴有 88 个琴键： 52 个白键 + 36 个黑键，分为 7 个大组和 2 个小组(音组)，看下图图 1
把一个完整的音组挑出来再细说 (照片照偏了逼死强迫疒) 图 2
围绕着两个黑键的三个白键，从左到右依次是 C、D、E，围绕着三个黑键的四个白键，依......
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</a>
<p class="post-meta">
Posted by Will on
2017-01-30
</p>
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<hr>
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<a href="/2016/04/21/mqtt-protocol/">
<h2 class="post-title">
MQTT 协议
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
MQTT 协议是一个基于发布/订阅模式的消息传输协议，它的设计思想是轻巧、开放、简单、规范，易于实现。这些特点使得它对很多场景来说都是很好的选择，特别是对于受限的环境如机器与机器的通信（M2M）以及物联网环境（IoT），而且 MQTT v3.1.1 在2014年就已经成了 OASIS(结构化信息标准促进组织) 标准。
官方网站：mqtt.org
附上 官方文档 和 国人翻译
MQTT 协议运......
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</a>
<p class="post-meta">
Posted by Will on
2016-04-21
</p>
</div>
<hr>
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<a href="/2016/03/06/mysql-server-sql-mode/">
<h2 class="post-title">
MySQL 的 SQL 模式
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
MySQL 有很多模式，但是自 5.6.6 之前，默认模式都是空的，也就是说没一个模式是开启的，之后 5.6.6 的默认模式是 NO_ENGINE_SUBSTITUTION，附上相关FAQ
5.6 版本的 SQL 模式可以查看：Server SQL Modes，有点多，只说下 Strict SQL Mode 吧
当遇到有关数据改动的语句（比如 insert 或者 update），如果数据无效......
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<p class="post-meta">
Posted by Will on
2016-03-06
</p>
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<hr>
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<a href="/2016/03/05/miscellaneous-tips-about-program-that-may-save-your-day/">
<h2 class="post-title">
杂七杂八
</h2>
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</h3>
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0x01 Mac OS 添加 Loopback 地址不像 Windows 可以自由使用所有的 loopback 地址，Mac OS 只有一个 127.0.0.1，想要使用其它比如 127.0.0.2 需要自行添加：ifconfig lo0 alias 127.0.0.2在 Mac OS X 10.11.3 上测试有效参考这篇文章，然而该命令并不能持久化，重启失效苹果的文档提供这样一个方法：建......
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<p class="post-meta">
Posted by Will on
2016-03-05
</p>
</div>
<hr>
<div class="post-preview">
<a href="/2016/01/12/select-and-selectors-module-in-python/">
<h2 class="post-title">
Python 中的 select 和 selectors 模块
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
select 模块封装了各个平台的 I/O 多路复用函数
各系统函数 epoll, kqueue 和 /dev/poll 要优于 poll，poll 又优于 select，实现时间当然也是从晚到早，可以参考这篇，讲解比较生动
Python 3.4 版本增加了 selectors 模块，是在 select 模块上更高一层的抽象，因为 select 模块太麻烦了啊，不同系统还要做不同的适配。除非......
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<p class="post-meta">
Posted by Will on
2016-01-12
</p>
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<a href="/2016/01/06/use-crontab-to-execute-scheduled-commands/">
<h2 class="post-title">
用 crontab 执行计划任务
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
用man查看crontab有两个说明，分别在section 1和section 5section 1是解释命令的，section 5是解释crontab文件格式的
注意这篇文章参考了Mac OS X El Capitan的man手册，Unix-like系统之前可能会有不同差别
先说下crontab命令，有两种格式第一种是从文件（e.g. crontab a.txt）或者标准输入（cronta......
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</a>
<p class="post-meta">
Posted by Will on
2016-01-06
</p>
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<a href="/2015/12/23/dns-messages/">
<h2 class="post-title">
关于DNS报文
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
关于DNS报文的格式，备忘备忘。
域名协议中所有的通信都是由同一种格式的报文来承载的，简单好记，粗看分为5个区块：1234567891011+---------------------+| Header |+---------------------+| Question | the question for the name server+-......
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<p class="post-meta">
Posted by Will on
2015-12-23
</p>
</div>
<hr>
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<a href="/2015/10/05/how-to-modify-sip-in-el-capitan/">
<h2 class="post-title">
关于 OS X El Capitan 的 SIP
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
El Capitan 较前版本有一个新特性叫：System Integrity Protection（系统完整性保护），简称 SIP，也叫做 rootless 模式。
直接影响就是即使命令行在 root 下也没法改动 /System，/bin，/sbin 和 /usr（/usr/local除外）下的文件了，会返回一个 Operation not permitted。
怎样关闭这个 SIP 模......
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<p class="post-meta">
Posted by Will on
2015-10-05
</p>
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<hr>
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<a href="/2015/10/05/python-learning-note-1/">
<h2 class="post-title">
Python 学习笔记 (1)
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
1. __future__模块导入这个模块来使用一些当前版本还没有正式拥有的语句或特性，两个方法可以检测一个语句或特性是否在当前版本可用，用with_statement举个例子：12345>>> from __future__ import with_statement>>> with_statement.getOptionalRelease()(2, 5......
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<p class="post-meta">
Posted by Will on
2015-10-05
</p>
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<a href="/2015/09/29/vim-and-bash-shortcuts/">
<h2 class="post-title">
vim 和 bash 的一些快捷键和配置
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
这里只打算记录一些简单的常用快捷键和配置 高级的用法和操作等用到了再更新 循序渐进
vim的简单配置用户目录下创建.vimrc文件：
123456789101112131415161718"显示行号set nu"语法高亮syntax on"Tab键宽度set tabstop=4"Tab替换为空格set expandtab"自动缩进set autoindent"编码set encoding=u......
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<p class="post-meta">
Posted by Will on
2015-09-29
</p>
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Copyright © 日常 2017
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