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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>bibitiger的博客</title>
<meta name="author" content="bibitiger">
<meta name="description" content="shell 字符串在shell中截取 原文地址：blog.bibitiger.cn/blog/2017/11/07/shell-string-cut/ Linux 的字符串截取很有用。有八种方法。
假设有变量 var=http://www.hao.com/123.htm #号截取，删除左边字符， …">
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<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="/atom.xml" rel="alternate" title="bibitiger的博客" type="application/atom+xml">
<link rel="canonical" href="http://blog.bibitiger.cn/">
<link href="/favicon.png" rel="shortcut icon">
<link href="/stylesheets/screen.css" media="screen, projection" rel="stylesheet" type="text/css">
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</head>
<body>
<div class="container">
<div class="left-col">
<div class="intrude-less">
<header id="header" class="inner"><div class="profilepic">
<!--script src="/javascripts/md5.js"></script>
<script type="text/javascript">
document.write("<img alt='Profile Picture' src='http://7xtz1f.com2.z0.glb.clouddn.com/image/octo/github/bibitigertiger.jpg-shuiyin.touxiang' style='width:160px;'/>");
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</div>
<h1><a href="/">bibitiger的博客</a></h1>
<p class="subtitle">把酒言欢.</p>
<nav id="main-nav"><ul class="main-navigation">
<li><a href="/">首页</a></li>
<li><a href="/blog/archives">全部文章</a></li>
</ul>
</nav>
<nav id="sub-nav">
<div class="social">
<a class="weibo" href="http://www.weibo.com/baronny" title="Weibo">Weibo</a>
<a class="jianshu" href="http://www.jianshu.com/users/f4d8eff68965/latest_articles" title="Jianshu">Jianshu</a>
<a class="dribbble" href="http://www.dribbble.com/baronny" title="Dribbble">Dribbble</a>
<a class="rss" href="/atom.xml" title="RSS">RSS</a>
</div>
</nav>
<hgroup>
</hgroup>
<section>
<h2>最新文章</h2>
<ul id="recent_posts">
<li class="post">
<a href="/blog/2017/11/07/shell-string-cut/">字符串在shell中截取</a>
</li>
<li class="post">
<a href="/blog/2017/11/06/use-sed-on-mac/">Sed在mac上的一些问题</a>
</li>
</ul>
</section>
<section>
<h2>分類</h2>
<span class='categories_tag'> <a href='/blog/categories/android' style='font-size: 100%'>Android(1)</a> <a href='/blog/categories/objective-c' style='font-size: 100%'>Objective-c(1)</a> <a href='/blog/categories/octopress' style='font-size: 100%'>Octopress(3)</a> <a href='/blog/categories/php' style='font-size: 100%'>Php(1)</a> <a href='/blog/categories/python' style='font-size: 100%'>Python(3)</a> <a href='/blog/categories/shell' style='font-size: 100%'>Shell(2)</a> <a href='/blog/categories/sheng-huo-sui-bi' style='font-size: 100%'>生活随笔(1)</a> </span>
</section>
</header>
</div>
</div>
<div class="mid-col">
<div class="mid-col-container">
<div id="content" class="inner">
<div itemscope itemtype="http://schema.org/Blog">
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-11-07T00:40:23+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/shell/'>shell</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/11/07/shell-string-cut/" itemprop="url">字符串在shell中截取</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/11/07/shell-string-cut/">blog.bibitiger.cn/blog/2017/11/07/shell-string-cut/</a></h2>
<p><br/></p>
<hr />
<p>Linux 的字符串截取很有用。有八种方法。
假设有变量 <code>var=http://www.hao.com/123.htm</code></p>
<ol>
<li><p>#号截取，删除左边字符，保留右边字符。</p>
<p> echo ${var#*//}</p>
<p> 其中 var 是变量名，# 号是运算符，*//表示从左边开始删除第一个 // 号及左边的所有字符</p>
<p> 即删除 <code>http://</code></p>
<p> 结果是 ：www.hao.com/123.htm</p></li>
</ol>
<a href="/blog/2017/11/07/shell-string-cut/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-11-06T23:15:49+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/shell/'>shell</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/11/06/use-sed-on-mac/" itemprop="url">Sed在mac上的一些问题</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/11/06/use-sed-on-mac/">blog.bibitiger.cn/blog/2017/11/06/use-sed-on-mac/</a></h2>
<p><br/></p>
<hr />
<p>今天要做一个文本拼接的活，本来很简单的事情，使用 sed /a /s轻轻松松就能搞定的事，结果因为mac的原因搞得简直痛不欲生。</p>
<p>让我们看下面一段代码</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$: touch test.json
</span><span class='line'>$: echo "[{"test":["abc","edf"]}" >> test.json
</span><span class='line'>$: sed -i '/test/a ,{"test1":["qwe"]}]' test.json
</span><span class='line'>$: sed -i 's/qwe/uio/g' test.json</span></code></pre></td></tr></table></div></figure>
<p>本来我们应该得出的结果是什么呢？</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$: cat test.json
</span><span class='line'> [{test:[abc,edf]}
</span><span class='line'> ,{"test1":["uio"]}]</span></code></pre></td></tr></table></div></figure>
<p>可是就是这么简单的语句，竟然出了问题，什么鬼呢？
<code>sed: 1: "/a ,{"test1":["qwe"]}]": command a expects \ followed by text</code></p>
<a href="/blog/2017/11/06/use-sed-on-mac/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-05-09T19:39:54+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/objective-c/'>objective-c</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/05/09/scanning-qrcode-barcode-image-oc/" itemprop="url">Objective-c扫描二维码和条形码</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/05/09/scanning-qrcode-barcode-image-oc/">blog.bibitiger.cn/blog/2017/04/11/install-php71-mac/</a></h2>
<p><br/></p>
<hr />
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-05-09T19:36:40+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/python/'>python</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/05/09/use-thread-in-pyqt/" itemprop="url">PyQt中Thread的使用</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/05/09/use-thread-in-pyqt/">blog.bibitiger.cn/blog/2017/04/11/install-php71-mac/</a></h2>
<p><br/></p>
<hr />
<p>PyQt中的Thread通常使用QThread，这个个人感觉封装的很好，比如我经常喜欢这样使用C++的thread：</p>
<a href="/blog/2017/05/09/use-thread-in-pyqt/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-05-09T19:35:24+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/python/'>python</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/05/09/make-loading-animation-by-qpainter/" itemprop="url">使用QPainter创建等待动画在PyQt中</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/05/09/make-loading-animation-by-qpainter/">blog.bibitiger.cn/blog/2017/04/11/install-php71-mac/</a></h2>
<p><br/></p>
<hr />
<p>具体的代码和使用可查看<a href="https://github.com/bibitiger/testWaitProgress">github仓库</a></p>
<p>实现旋转动画还可以使用QGraphicsItemAnimation来实现，这个以后再说，今天说说用QPainter实现这个效果。</p>
<a href="/blog/2017/05/09/make-loading-animation-by-qpainter/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-04-17T22:41:22+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/python/'>python</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/04/17/pythondecoratorsforfunctions/" itemprop="url">Python中的注解“@”</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/04/17/pythondecoratorsforfunctions/">blog.bibitiger.cn/blog/2017/04/17/pythondecoratorsforfunctions/</a></h2>
<p><br/></p>
<hr />
<p>Python3.0之后加入新特性Decorators，以@为标记修饰function和class。有点类似c++的宏和java的注解。Decorators用以修饰约束function和class，分为带参数和不带参数，影响原有输出，例如类静态函数我们要表达的时候需要函数前面加上修饰@staticmethod或@classmethod,为什么这样做呢？下面用简单的例子来看一下，具体内容可以查看：<a href="http://www.python.org/dev/peps/pep-0318/">官方解释</a></p>
<a href="/blog/2017/04/17/pythondecoratorsforfunctions/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-04-11T17:10:47+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/php/'>php</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/04/11/install-php71-mac/" itemprop="url">在mac上安装php7.1</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/04/11/install-php71-mac/">blog.bibitiger.cn/blog/2017/04/11/install-php71-mac/</a></h2>
<p><br/></p>
<hr />
<p>mac上预装了PHP，但是版本是5.5.x，由于有的时候要用最新的版本，或者项目需要，我们需要不同版本的PHP经行开发。有多种办法可以搞定，比如说如果是团队开发，版本控制的话可以使用<strong><em>Vagrant</em></strong>虚拟机，这个之后再说，今天就简单的将mac上的PHP升级，以7.1版本为例，其实很简单。</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>curl -s https://php-osx.liip.ch/install.sh | bash -s 7.1</span></code></pre></td></tr></table></div></figure>
<p>在终端里运行，时间可能会有点长，视个人网络情况而定。</p>
<a href="/blog/2017/04/11/install-php71-mac/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-02-23T11:47:23+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/octopress/'>octopress</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/02/23/duel-github-cant-for-baiduspiders/" itemprop="url">解决github-pages无法被百度抓取问题（octopress）</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/02/23/duel-github-cant-for-baiduspiders/">http://blog.bibitiger.cn/blog/2017/02/23/duel-github-cant-for-baiduspiders/</a></h2>
<p><br></p>
<hr />
<p></br></p>
<p>网上已经有很多关于这个问题的解决方案,例如CDN到七牛等的镜像缓存、修改ip代理、云服务器等等，例如<a href="https://www.zhihu.com/question/30898326/answer/137735246">知乎上的问答“如何解决百度爬虫无法爬取搭建在Github上的个人博客的问题？”</a>，在此就不一一复述了。直接说一个方便的解决方案。</p>
<a href="/blog/2017/02/23/duel-github-cant-for-baiduspiders/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-02-21T15:19:29+08:00" data-updated="true" itemprop="datePublished"></time></div>
<div class="tags">
<a class='category' href='/blog/categories/sheng-huo-sui-bi/'>生活随笔</a>
</div>
</div>
<h1 class="title" itemprop="name"><a href="/blog/2017/02/21/to-south/" itemprop="url">随笔“南行“</a></h1>
<div class="entry-content" itemprop="articleBody">
<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/02/21/to-south/">blog.bibitiger.cn/blog/2017/02/21/to-south/</a></h2>
<p></br></p>
<hr />
<p></br></p>
<h3>南行</h3>
<p><br></p>
<a href="/blog/2017/02/21/to-south/" class="more-link">更多 →</a>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2017-02-21T14:22:35+08:00" data-updated="true" itemprop="datePublished"></time></div>
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<a class='category' href='/blog/categories/octopress/'>octopress</a>
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<h1 class="title" itemprop="name"><a href="/blog/2017/02/21/pull-octopress-from-github/" itemprop="url">将已有octopress从github搬移到本地</a></h1>
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<h2>原文地址：<a href="http://blog.bibitiger.cn/blog/2017/02/21/pull-octopress-from-github/">blog.bibitiger.cn/blog/2017/02/21/pull-octopress-from-github/</a></h2>
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当我们换了电脑或者遗失了原本项目的时候，我们就需要将原来我们部署在github上的octopress博客重新搬移到本地。这里我们根据之前建立octopress项目的过程，首先清楚两个分支各自的功能：</p>
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<th style="text-align:center;"> source </th>
<th style="text-align:center;"> octopress文件及代码，假如我们的工程根目录为octopress，source对应的就是octopress </th>
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<td style="text-align:center;"> master </td>
<td style="text-align:center;"> octopress deploy时生成的缓存文件，可以认为是<em>deploy文件夹，对应于octopress/</em>deploy </td>
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<a href="/blog/2017/02/21/pull-octopress-from-github/" class="more-link">更多 →</a>
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