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<p>写一个 bash 脚本以统计一个文本文件 <code>words.txt</code> 中每个单词出现的频率。</p>
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<p>写一个 bash 脚本以统计一个文本文件 <code>words.txt</code> 中每个单词出现的<span data-keyword="frequency-textfile">频率</span>。</p>
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<p>为了简单起见,你可以假设:</p>
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<ul>
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<li><code>words.txt</code>只包括小写字母和 <code>' '</code> 。</li>
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<li><code>words.txt</code>只包括小写字母和 <code>' '</code> 。</li>
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<li>每个单词只由小写字母组成。</li>
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<li>单词间由一个或多个空格字符分隔。</li>
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</ul>
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<p>假设 <code>words.txt</code> 内容如下:</p>
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<pre>the day is sunny the the
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<pre>
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the day is sunny the the
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the sunny is is
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</pre>
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<p>你的脚本应当输出(以词频降序排列):</p>
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<pre>the 4
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<pre>
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the 4
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is 3
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sunny 2
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day 1
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