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<meta name="description" content="Ack是一个给程序员用的grep, 使用perl regular expressions, 而不是POSIX/GNU subset. why ack? 使用perl regular expressions, 忘掉grep那套不人性的pattern吧
速度快, 默认只搜索程序代码文件
自动忽略. …">
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<h1 class="entry-title"><a href="/posts/2011-12-16-ack-better-grep/">Ack - Better Grep</a></h1>
<p class="meta">
<time datetime="2011-12-16T11:17:00+08:00" pubdate data-updated="true">Dec 16<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><p>Ack是一个给程序员用的grep, 使用perl regular expressions, 而不是POSIX/GNU subset.</p>
<h2>why ack?</h2>
<ul>
<li>使用perl regular expressions, 忘掉grep那套不人性的pattern吧</li>
<li>速度快, 默认只搜索程序代码文件</li>
<li>自动忽略.svn, .git, CVS这类目录, 默认递归搜索子目录</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="c"># with grep</span>
</span><span class='line'><span class="nv">$ </span>grep pattern <span class="k">$(</span>find . -type f | grep -v <span class="s1">'\.svn'</span><span class="k">)</span>
</span><span class='line'>or
</span><span class='line'><span class="nv">$ </span>grep -R --exclude-dir .svn pattern
</span><span class='line'><span class="c"># with ack</span>
</span><span class='line'><span class="nv">$ </span>ack pattern
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>支持搜索指定文件类型</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="c"># 只搜索ruby code</span>
</span><span class='line'><span class="nv">$ </span>ack --ruby pattern
</span></code></pre></td></tr></table></div></figure>
<h2>install</h2>
<figure class='code'><figcaption><span></span></figcaption><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='bash'><span class='line'><span class="c"># mac</span>
</span><span class='line'><span class="nv">$ </span>brew install ack
</span><span class='line'><span class="c"># ubuntu</span>
</span><span class='line'><span class="nv">$ </span>sudo apt-get install ack-grep
</span></code></pre></td></tr></table></div></figure>
<h2>integrate into vim</h2>
<ul>
<li>install ack.vim</li>
<li>set grepprg=ack in vimrc</li>
</ul>
<h2>custom ack</h2>
<p>Ack默认包含很多filetype => extensions的设置，但新出现的语言不一定支持。好在ack提供—type-add TYPE=.EXTENSION[,.EXT2[,…]], —type-set TYPE=.EXTENSION[,.EXT2[,…]]来扩展。经常用的可以加到~/.ackrc里, 我的.ackrc:</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>cat ~/.ackrc
</span><span class='line'>--type-add
</span><span class='line'><span class="nv">ruby</span><span class="o">=</span>.haml,.ru
</span><span class='line'>--type-add
</span><span class='line'><span class="nv">css</span><span class="o">=</span>.scss,.sass,.less
</span><span class='line'>--type-add
</span><span class='line'><span class="nv">js</span><span class="o">=</span>.coffee
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-12-you-dao-zi-dian-httpjie-kou/">有道字典 Chrome Extension</a></h1>
<p class="meta">
<time datetime="2011-12-12T11:17:00+08:00" pubdate data-updated="true">Dec 12<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><p>有道字典的chrome extension会把鼠标下的词log到console里，debug的时候让人烦, 看了下code, 直接用的console.log, 发布的时候也没注释掉. 跑到~/Library/Application Support/Google/Chrome/Default/Extensions/nbndkplefmmhmcmfjanjaakhhkiegogd/1.0_0下把content.js,background.html里的console.log都注释掉，安静了。</p>
<p>大概看了下extension code, 发现两个有意思的地方：</p>
<ul>
<li>打包的时候连.svn目录都没放过</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>svn info
</span><span class='line'>Path: .
</span><span class='line'>URL: https://dev.corp.youdao.com/svn/outfox/products/desktop/incubator/mac/GetWordExtension/Chrome/extension
</span><span class='line'>Repository Root: https://dev.corp.youdao.com/svn/outfox
</span><span class='line'>Repository UUID: 36a6777f-fe3c-0410-890b-904d6044f29d
</span><span class='line'>Revision: 285097
</span><span class='line'>Node Kind: directory
</span><span class='line'>Schedule: normal
</span><span class='line'>Last Changed Author: huangdx
</span><span class='line'>Last Changed Rev: 277738
</span><span class='line'>Last Changed Date: 2011-09-13 14:00:17 +0800 <span class="o">(</span>二, 13 9 2011<span class="o">)</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>取词的时候调用的是本机有道字典app提供的http接口</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='javascript'><span class='line'><span class="c1">//in background.html</span>
</span><span class='line'> <span class="kd">function</span> <span class="nx">SendResult</span><span class="p">(</span><span class="nx">word</span><span class="p">,</span> <span class="nx">pos</span><span class="p">,</span> <span class="nx">type</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">s</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">XMLHttpRequest</span><span class="p">;</span>
</span><span class='line'> <span class="nx">s</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="s2">"GET"</span><span class="p">,</span> <span class="s2">"http://localhost:32445/getword?word="</span> <span class="o">+</span> <span class="nx">word</span> <span class="o">+</span> <span class="s2">"&pos="</span> <span class="o">+</span> <span class="nx">pos</span> <span class="o">+</span> <span class="s2">"&type="</span> <span class="o">+</span> <span class="nx">type</span><span class="p">,</span> <span class="kc">true</span><span class="p">);</span>
</span><span class='line'> <span class="c1">//console.log('sending...')</span>
</span><span class='line'> <span class="nx">s</span><span class="p">.</span><span class="nx">send</span><span class="p">()</span>
</span><span class='line'> <span class="p">};</span>
</span></code></pre></td></tr></table></div></figure>
<p>用curl试了下，可以发送请求，但响应为空</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>curl -vv <span class="s1">'http://localhost:32445/getword?word=for%20suppliers&pos=8&type=0'</span>
</span><span class='line'>* About to connect<span class="o">()</span> to localhost port 32445 <span class="o">(</span><span class="c">#0)</span>
</span><span class='line'>* Trying ::1... Connection refused
</span><span class='line'>* Trying 127.0.0.1... connected
</span><span class='line'>* Connected to localhost <span class="o">(</span>127.0.0.1<span class="o">)</span> port 32445 <span class="o">(</span><span class="c">#0)</span>
</span><span class='line'>> GET /getword?word<span class="o">=</span><span class="k">for</span>%20suppliers&pos<span class="o">=</span>8&type<span class="o">=</span>0 HTTP/1.1
</span><span class='line'>> User-Agent: curl/7.21.4 <span class="o">(</span>universal-apple-darwin11.0<span class="o">)</span> libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
</span><span class='line'>> Host: localhost:32445
</span><span class='line'>> Accept: */*
</span><span class='line'>>
</span><span class='line'>* Empty reply from server
</span><span class='line'>* Connection <span class="c">#0 to host localhost left intact</span>
</span><span class='line'>curl: <span class="o">(</span>52<span class="o">)</span> Empty reply from server
</span><span class='line'>* Closing connection <span class="c">#0</span>
</span></code></pre></td></tr></table></div></figure>
<p>word, pos, type这三个参数只要少一个有道字典就会crash</p>
<p>这次http request只是一个trigger, 有道字典会向dict.youdao.com发一个request:</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
<span class='line-number'>30</span>
<span class='line-number'>31</span>
<span class='line-number'>32</span>
<span class='line-number'>33</span>
<span class='line-number'>34</span>
<span class='line-number'>35</span>
<span class='line-number'>36</span>
<span class='line-number'>37</span>
<span class='line-number'>38</span>
<span class='line-number'>39</span>
<span class='line-number'>40</span>
<span class='line-number'>41</span>
<span class='line-number'>42</span>
<span class='line-number'>43</span>
<span class='line-number'>44</span>
<span class='line-number'>45</span>
<span class='line-number'>46</span>
<span class='line-number'>47</span>
<span class='line-number'>48</span>
<span class='line-number'>49</span>
<span class='line-number'>50</span>
<span class='line-number'>51</span>
<span class='line-number'>52</span>
<span class='line-number'>53</span>
<span class='line-number'>54</span>
<span class='line-number'>55</span>
<span class='line-number'>56</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>curl -vv <span class="s1">'http://dict.youdao.com/fsearch?q=for%20suppliers&pos=8&keyfrom=mac.scrtrans.0&id=E33EC7736AFDCABB184051CD3757CA73&vendor=cidian.youdao.com&client=macdict'</span>
</span><span class='line'>* About to connect<span class="o">()</span> to dict.youdao.com port 80 <span class="o">(</span><span class="c">#0)</span>
</span><span class='line'>* Trying 61.135.218.32... connected
</span><span class='line'>* Connected to dict.youdao.com <span class="o">(</span>61.135.218.32<span class="o">)</span> port 80 <span class="o">(</span><span class="c">#0)</span>
</span><span class='line'>> GET /fsearch?q<span class="o">=</span><span class="k">for</span>%20suppliers&pos<span class="o">=</span>8&keyfrom<span class="o">=</span>mac.scrtrans.0&id<span class="o">=</span>E33EC7736AFDCABB184051CD3757CA73&vendor<span class="o">=</span>cidian.youdao.com&client<span class="o">=</span>macdict HTTP/1.1
</span><span class='line'>> User-Agent: curl/7.21.4 <span class="o">(</span>universal-apple-darwin11.0<span class="o">)</span> libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
</span><span class='line'>> Host: dict.youdao.com
</span><span class='line'>> Accept: */*
</span><span class='line'>>
</span><span class='line'>< HTTP/1.1 200 OK
</span><span class='line'>< Server: nginx
</span><span class='line'>< Date: Tue, 13 Dec 2011 07:10:55 GMT
</span><span class='line'>< Content-Type: text/xml; <span class="nv">charset</span><span class="o">=</span>utf-8
</span><span class='line'>< Connection: keep-alive
</span><span class='line'>< Cache-Control: private
</span><span class='line'>< Content-Language: en-US
</span><span class='line'>< Set-Cookie: <span class="nv">OUTFOX_SEARCH_USER_ID</span><span class="o">=</span>-447518408@123.117.56.163; <span class="nv">domain</span><span class="o">=</span>.youdao.com; <span class="nv">expires</span><span class="o">=</span>Thu, 05-Dec-2041 07:10:55 GMT
</span><span class='line'>< Set-Cookie: <span class="nv">JSESSIONID</span><span class="o">=</span>abcdjNBcCWPPK4igOq2qt; <span class="nv">domain</span><span class="o">=</span>youdao.com; <span class="nv">path</span><span class="o">=</span>/
</span><span class='line'>< Vary: Accept-Encoding
</span><span class='line'>< Content-Length: 1477
</span><span class='line'><
</span><span class='line'><?xml <span class="nv">version</span><span class="o">=</span><span class="s2">"1.0"</span> <span class="nv">encoding</span><span class="o">=</span><span class="s2">"UTF-8"</span>?>
</span><span class='line'>
</span><span class='line'><yodaodict>
</span><span class='line'> <<span class="k">return</span>-phrase><!<span class="o">[</span>CDATA<span class="o">[</span>suppliers<span class="o">]]</span>></return-phrase>
</span><span class='line'>
</span><span class='line'> <phonetic-symbol>sə<span class="err">'</span>plaiəz</phonetic-symbol>
</span><span class='line'> <dictcn-speach>suppliers</dictcn-speach>
</span><span class='line'> <custom-translation>
</span><span class='line'> <<span class="nb">type</span>>ec</type>
</span><span class='line'> <translation><content><!<span class="o">[</span>CDATA<span class="o">[</span>n. 供应商（supplier的复数）<span class="o">]]</span>></content></translation>
</span><span class='line'> </custom-translation>
</span><span class='line'>
</span><span class='line'> <yodao-web-dict>
</span><span class='line'> <web-translation>
</span><span class='line'> <key><!<span class="o">[</span>CDATA<span class="o">[</span>Suppliers<span class="o">]]</span>></key>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>供应商<span class="o">]]</span>></value></trans>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>供货商<span class="o">]]</span>></value></trans>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>数据库<span class="o">]]</span>></value></trans>
</span><span class='line'> </web-translation>
</span><span class='line'> <web-translation>
</span><span class='line'> <key><!<span class="o">[</span>CDATA<span class="o">[</span>Overview Suppliers<span class="o">]]</span>></key>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>概览<span class="o">]]</span>></value></trans>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>供应商<span class="o">]]</span>></value></trans>
</span><span class='line'> </web-translation>
</span><span class='line'> <web-translation>
</span><span class='line'> <key><!<span class="o">[</span>CDATA<span class="o">[</span><span class="k">select </span>suppliers<span class="o">]]</span>></key>
</span><span class='line'> <trans><value><!<span class="o">[</span>CDATA<span class="o">[</span>挑选供应商<span class="o">]]</span>></value></trans>
</span><span class='line'> </web-translation>
</span><span class='line'> </yodao-web-dict>
</span><span class='line'>
</span><span class='line'> <recommend><!<span class="o">[</span>CDATA<span class="o">[</span>supplier<span class="o">]]</span>></recommend>
</span><span class='line'> <sexp>0</sexp>
</span><span class='line'></yodaodict>
</span><span class='line'>* Connection <span class="c">#0 to host dict.youdao.com left intact</span>
</span><span class='line'>* Closing connection <span class="c">#0</span>
</span></code></pre></td></tr></table></div></figure>
<p>拿到结果后由有道字典显示一个提示窗口.</p>
<p>这种实现方式倒也算精巧, 其他app要用这个http接口也比较方便，只是32445端口连个http 200都不返回粗暴了点.</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-11-speed-up-rails-asset-pipeline/">Speed Up Rails Asset Pipeline</a></h1>
<p class="meta">
<time datetime="2011-12-11T20:48:00+08:00" pubdate data-updated="true">Dec 11<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><p><a href="http://guides.rubyonrails.org/asset_pipeline.html">Asset pipeline</a>是Rails 3.1里引入的一个特性, 用来帮助拼接，压缩js/css,同时对缓存asset提供了更好的支持.</p>
<p>Asset pipe本身只是对<a href="https://github.com/sstephenson/sprockets">Sprockets</a>做了一层封装, 通过<code>Rails.application.assets</code>可以得到Sprockets自己的rack app.</p>
<p>如果application.js里用到了一堆的js, 在development模式下会发现页面很慢, 即使用了<a href="https://github.com/paneq/active_reload">active_reload</a>来加速.在chrome console里看下network tab，每次js请求都在100ms以上。慢的原因在于每次请求都要过一次Rails/application里定义的middleware, 跳过这些middleware之后就快多了. 改下config.ru, 世界又和谐了:</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="c1"># This file is used by Rack-based servers to start the application.</span>
</span><span class='line'><span class="nb">require</span> <span class="o">::</span><span class="no">File</span><span class="o">.</span><span class="n">expand_path</span><span class="p">(</span><span class="s1">'../config/environment'</span><span class="p">,</span> <span class="bp">__FILE__</span><span class="p">)</span>
</span><span class='line'>
</span><span class='line'><span class="n">map</span> <span class="s1">'/assets'</span> <span class="k">do</span>
</span><span class='line'> <span class="n">assets</span> <span class="o">=</span> <span class="no">Rails</span><span class="o">.</span><span class="n">application</span><span class="o">.</span><span class="n">assets</span>
</span><span class='line'> <span class="n">run</span> <span class="n">assets</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'>
</span><span class='line'><span class="n">map</span> <span class="s1">'/'</span> <span class="k">do</span>
</span><span class='line'> <span class="n">run</span> <span class="no">Rails</span><span class="o">.</span><span class="n">application</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-10-gao-xiao-neng-wen-ben-bian-ji-de-7ge-xi-guan/">高效能文本编辑的7个习惯</a></h1>
<p class="meta">
<time datetime="2011-12-10T12:59:00+08:00" pubdate data-updated="true">Dec 10<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><p><a href="http://www.moolenaar.net/habits.html">Seven habits of effective text editing</a></p>
<h2>编辑单个文件</h2>
<h3>1. 快速移动</h3>
<ul>
<li>查找光标下单词在当前文件的其它位置
<ol>
<li>* 向后查找</li>
<li># 向前查找</li>
</ol>
</li>
<li>搜索文本, /pattern</li>
<li>使用%跳转到对应块的结尾/开头，安装<a href="http://www.vim.org/scripts/script.php?script_id=39">matchit</a>插件效果更好</li>
<li>使用gd跳转到变量定义</li>
</ul>
<p>掌握更多高效编辑命令的三个基本步骤:
* 留意编辑过程中的重复动作和花时间较多的地方
* 找出一个可以更快完成这些操作的命令
* 反复练习，直到形成习惯，不需要思考靠直觉就能敲出命令</p>
<h3>2. 不要重复输入两次</h3>
<ul>
<li>善用.命令重做前一个修改</li>
<li>使用自动补全, 安装<a href="https://github.com/ervandew/supertab">supertab</a>后可用tab键补全</li>
<li>录制宏, qa开始录制，q结束宏, @a重放宏</li>
</ul>
<h3>3. 自动修复拼写错误</h3>
<ul>
<li>abbr</li>
<li>syntax hightlight</li>
</ul>
<h2>编辑多个文件</h2>
<h3>4. 很少只在单独一个文件上工作</h3>
<ul>
<li>ctags, Ctrl+] 跳转到定义处</li>
<li>:grep, :cn</li>
</ul>
<h3>5. 与其它程序协同工作</h3>
<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'>:!command</span></code></pre></td></tr></table></div></figure>
<h3>6. Text is structured</h3>
<p>自动化编译，修改过程</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>
</pre></td><td class='code'><pre><code class=''><span class='line'>:make
</span><span class='line'>:set errorformat=xxx</span></code></pre></td></tr></table></div></figure>
<h2>磨快你的矩</h2>
<h3>7. 养成习惯</h3>
<p>这一点最重要，花大把时间找到合适的命令但很快就忘掉是很不划算的。</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-10-crontab-tips/">Crontab Tips</a></h1>
<p class="meta">
<time datetime="2011-12-10T12:02:00+08:00" pubdate data-updated="true">Dec 10<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><h2>crontab command</h2>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="c"># 设置编辑器</span>
</span><span class='line'><span class="nv">$ </span><span class="nb">export </span><span class="nv">EDITOR</span><span class="o">=</span>vim
</span><span class='line'><span class="c"># 编辑</span>
</span><span class='line'><span class="nv">$ </span>crontab -e <span class="o">[</span>-u user<span class="o">]</span>
</span><span class='line'><span class="c"># 列出crontab内容</span>
</span><span class='line'><span class="nv">$ </span>crontab -l <span class="o">[</span>-u user<span class="o">]</span>
</span><span class='line'><span class="c"># 删除crontab文件</span>
</span><span class='line'><span class="nv">$ </span>crontab -r <span class="o">[</span>-u user<span class="o">]</span>
</span></code></pre></td></tr></table></div></figure>
<h2>crontab syntax</h2>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>* * * * * <span class="nb">command</span>
</span><span class='line'>| | | | |
</span><span class='line'>| | | | |- day of week<span class="o">(</span>0-6<span class="o">)</span> 0 means sunday
</span><span class='line'>| | | |--- month<span class="o">(</span>1-12<span class="o">)</span>
</span><span class='line'>| | |----- day of month<span class="o">(</span>1-31<span class="o">)</span>
</span><span class='line'>| |------- hour
</span><span class='line'>|--------- minute<span class="o">(</span>0-59<span class="o">)</span>
</span><span class='line'>
</span><span class='line'>* 表示的项可以用,分隔指定多个值<span class="o">(</span>如5,15,25<span class="o">)</span>，也可以指定周期，如在minute项上写*/5表示每5分钟执行一次
</span></code></pre></td></tr></table></div></figure>
<h2>crontab environment</h2>
<p>cron脚本执行的环境跟正常用户执行的有区别，~/.bashrc不会被执行, 这一点经常会引起问题, 可以在crontab里设置环境变量来减少影响.</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="c"># PATH, SHELL, MAILTO比较常用, 如</span>
</span><span class='line'><span class="nv">PATH</span><span class="o">=</span>/usr/bin:/usr/sbin:/bin:/sbin
</span><span class='line'><span class="nv">SHELL</span><span class="o">=</span>/bin/bash
</span><span class='line'><span class="nv">MAILTO</span><span class="o">=</span>xxx@xxx.com
</span><span class='line'>
</span><span class='line'>1 * * * * find /var/data/upload/ -mtime 30 -exec rm -- <span class="o">{}</span> +
</span></code></pre></td></tr></table></div></figure>
<p>默认情况crontab按OS时区调度, 而不是用户时区，可以通过指定TZ环境变量设实际要用的时区</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">TZ</span><span class="o">=</span>UTC
</span><span class='line'>1 * * * * find /var/data/upload/ -mtime 30 -exec rm -- <span class="o">{}</span> +
</span></code></pre></td></tr></table></div></figure>
<h1>crontab notification</h1>
<p>如果command有输出(stdout/stderr)，crond会发送通知邮件, 具体发送给谁可以通过MAILTO定义，默认发送给当前用户。
一般情况stdout可以忽略，所以经常会看到crontab里有 command >/dev/null; stderr一定不要忽略，否则cron job有错误无法正常执行都不知道。</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-09-bash-tips-0/">Bash Tips - 0</a></h1>
<p class="meta">
<time datetime="2011-12-09T20:18:00+08:00" pubdate data-updated="true">Dec 9<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><ul>
<li>为变量设置缺省值</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><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='bash'><span class='line'>: <span class="k">${</span><span class="nv">BIND_PORT</span><span class="p">:=9999</span><span class="k">}</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>取得前一个在后台运行的进程pid</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>sleep 10 &
</span><span class='line'><span class="nv">$ </span><span class="nb">echo</span> <span class="nv">$!</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>当前脚本的绝对路径</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><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='bash'><span class='line'><span class="nv">SCRIPT_PATH</span><span class="o">=</span><span class="sb">`</span>readlink -f <span class="s2">"$0"</span><span class="sb">`</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/posts/2011-12-09-rvm-global-gems/">Rvm Global Gems</a></h1>
<p class="meta">
<time datetime="2011-12-09T19:07:00+08:00" pubdate data-updated="true">Dec 9<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><p>用rvm安装多了ruby版本后，一些经常用的gem需要在多个版本下都重装一次，很费事。不过还好rvm早有<a href="http://beginrescueend.com/gemsets/initial/">解决方案</a>，可以通过编辑~/.rvm/gemsets/global.gems来添加全局的gemsets, 比如必不可少的bundler</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'>bundler</span></code></pre></td></tr></table></div></figure>
<p>也可以指定版本</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'>bundler -v~>1.0.21</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blogs/115">Lucene 3下最快的中文分词器</a></h1>
<p class="meta">
<time datetime="2011-06-19T00:00:00+08:00" pubdate data-updated="true">Jun 19<span>th</span>, 2011</time>
</p>
</header>
<div class="entry-content"><h1>包包分词器 – 一个基于字典的快速中文分词器</h1>
<h2>source code</h2>
<ul>
<li><a href="https://github.com/zzzhc/baobao-analyzer">github project</a></li>
</ul>
<h2>features</h2>
<ul>
<li>简单 1000LOC</li>
<li>高效 7M+ chars/second</li>
<li>支持中文，英语，数字</li>
<li>自动识别未登录词</li>
<li>支持OffsetAttribute</li>
<li>支持TypeAttribute</li>
<li>支持PositionIncrementAttribute</li>
</ul>
<h2>usage</h2>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="n">Dict</span> <span class="n">dict</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Dict</span><span class="o">();</span>
</span><span class='line'><span class="n">dict</span><span class="o">.</span><span class="na">addAllSpecialTypes</span><span class="o">();</span>
</span><span class='line'><span class="n">BufferedReader</span> <span class="n">dictReader</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BufferedReader</span><span class="o">(</span><span class="k">new</span> <span class="n">InputStreamReader</span><span class="o">(</span>
</span><span class='line'> <span class="k">new</span> <span class="nf">FileInputStream</span><span class="o">(</span><span class="s">"dict.txt"</span><span class="o">),</span> <span class="s">"UTF-8"</span><span class="o">));</span>
</span><span class='line'><span class="n">dict</span><span class="o">.</span><span class="na">load</span><span class="o">(</span><span class="n">dictReader</span><span class="o">);</span>
</span><span class='line'><span class="n">dictReader</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span><span class='line'><span class="n">dict</span><span class="o">.</span><span class="na">optimize</span><span class="o">();</span>
</span><span class='line'><span class="n">DictAnalyzer</span> <span class="n">dictAnalyzer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">DictAnalyzer</span><span class="o">(</span><span class="n">dict</span><span class="o">);</span>
</span></code></pre></td></tr></table></div></figure>
<h2>benchmark</h2>
<p>ant benchmark</p>
<figure class='code'><figcaption><span></span></figcaption><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>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
<span class='line-number'>30</span>
<span class='line-number'>31</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="n">supported</span> <span class="nl">features:</span>
</span><span class='line'> <span class="n">CharTerm</span> <span class="n">Offset</span> <span class="n">PositionIncrement</span> <span class="n">Term</span> <span class="n">Type</span>
</span><span class='line'> <span class="n">IKAnalyzer</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">N</span> <span class="n">Y</span> <span class="n">N</span>
</span><span class='line'> <span class="n">MMSegAnalyzer</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">N</span> <span class="n">Y</span> <span class="n">Y</span>
</span><span class='line'> <span class="n">PaodingAnalyzer</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">N</span> <span class="n">Y</span> <span class="n">Y</span>
</span><span class='line'><span class="n">StandardAnalyzer</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span>
</span><span class='line'> <span class="n">BaoBaoAnalyzer</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span> <span class="n">Y</span>
</span><span class='line'>
</span><span class='line'><span class="n">test</span> <span class="mi">1</span><span class="o">,</span> <span class="n">sample</span> <span class="n">length</span><span class="o">=</span><span class="mi">26265</span>
</span><span class='line'> <span class="n">name</span> <span class="n">chars</span> <span class="n">time</span> <span class="n">tokens</span> <span class="nf">speed</span><span class="o">(</span><span class="n">chars</span><span class="o">/</span><span class="n">second</span><span class="o">)</span>
</span><span class='line'> <span class="n">PaodingAnalyzer</span> <span class="mi">26265</span> <span class="mf">0.610</span> <span class="mi">12542</span> <span class="mf">43036.87</span>
</span><span class='line'> <span class="n">MMSegAnalyzer</span> <span class="mi">26265</span> <span class="mf">0.314</span> <span class="mi">14007</span> <span class="mf">83566.52</span>
</span><span class='line'> <span class="n">IKAnalyzer</span> <span class="mi">26265</span> <span class="mf">0.262</span> <span class="mi">16016</span> <span class="mf">100177.91</span>
</span><span class='line'><span class="n">StandardAnalyzer</span> <span class="mi">26265</span> <span class="mf">0.141</span> <span class="mi">22366</span> <span class="mf">185727.87</span>
</span><span class='line'> <span class="n">BaoBaoAnalyzer</span> <span class="mi">26265</span> <span class="mf">0.038</span> <span class="mi">18185</span> <span class="mf">695682.16</span>
</span><span class='line'>
</span><span class='line'><span class="n">test</span> <span class="mi">2</span><span class="o">,</span> <span class="n">sample</span> <span class="n">length</span><span class="o">=</span><span class="mi">262650</span>
</span><span class='line'> <span class="n">name</span> <span class="n">chars</span> <span class="n">time</span> <span class="n">tokens</span> <span class="nf">speed</span><span class="o">(</span><span class="n">chars</span><span class="o">/</span><span class="n">second</span><span class="o">)</span>
</span><span class='line'> <span class="n">PaodingAnalyzer</span> <span class="mi">262650</span> <span class="mf">0.187</span> <span class="mi">125420</span> <span class="mf">1402139.61</span>
</span><span class='line'> <span class="n">IKAnalyzer</span> <span class="mi">262650</span> <span class="mf">0.163</span> <span class="mi">160160</span> <span class="mf">1613693.16</span>
</span><span class='line'> <span class="n">MMSegAnalyzer</span> <span class="mi">262650</span> <span class="mf">0.158</span> <span class="mi">140070</span> <span class="mf">1664009.53</span>
</span><span class='line'> <span class="n">BaoBaoAnalyzer</span> <span class="mi">262650</span> <span class="mf">0.041</span> <span class="mi">181850</span> <span class="mf">6362134.44</span>
</span><span class='line'><span class="n">StandardAnalyzer</span> <span class="mi">262650</span> <span class="mf">0.020</span> <span class="mi">223660</span> <span class="mf">12905789.80</span>
</span><span class='line'>
</span><span class='line'><span class="n">test</span> <span class="mi">3</span><span class="o">,</span> <span class="n">sample</span> <span class="n">length</span><span class="o">=</span><span class="mi">2626500</span>
</span><span class='line'> <span class="n">name</span> <span class="n">chars</span> <span class="n">time</span> <span class="n">tokens</span> <span class="nf">speed</span><span class="o">(</span><span class="n">chars</span><span class="o">/</span><span class="n">second</span><span class="o">)</span>
</span><span class='line'> <span class="n">IKAnalyzer</span> <span class="mi">2626500</span> <span class="mf">2.251</span> <span class="mi">1601600</span> <span class="mf">1166564.72</span>
</span><span class='line'> <span class="n">PaodingAnalyzer</span> <span class="mi">2626500</span> <span class="mf">1.462</span> <span class="mi">1254200</span> <span class="mf">1796381.55</span>
</span><span class='line'> <span class="n">MMSegAnalyzer</span> <span class="mi">2626500</span> <span class="mf">1.043</span> <span class="mi">1400700</span> <span class="mf">2519010.94</span>
</span><span class='line'> <span class="n">BaoBaoAnalyzer</span> <span class="mi">2626500</span> <span class="mf">0.352</span> <span class="mi">1818500</span> <span class="mf">7458959.20</span>
</span><span class='line'><span class="n">StandardAnalyzer</span> <span class="mi">2626500</span> <span class="mf">0.202</span> <span class="mi">2236600</span> <span class="mf">13015280.16</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blogs/107">Mysqld 5.1.41的一个神奇bug</a></h1>