add leetcode problem-cn part6

算法题（国内版）/problem (English)/统计词频(English) [word-frequency].html

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+<p>Write a bash script to calculate the frequency of each word in a text file <code>words.txt</code>.</p>
+
+
+
+<p>For simplicity sake, you may assume:</p>
+
+
+
+<ul>
+
+	<li><code>words.txt</code> contains only lowercase characters and space <code>&#39; &#39;</code> characters.</li>
+
+	<li>Each word must consist of lowercase characters only.</li>
+
+	<li>Words are separated by one or more whitespace characters.</li>
+
+</ul>
+
+
+
+<p><strong>Example:</strong></p>
+
+
+
+<p>Assume that <code>words.txt</code> has the following content:</p>
+
+
+
+<pre>
+
+the day is sunny the the
+
+the sunny is is
+