62 lines
1.2 KiB
HTML
62 lines
1.2 KiB
HTML
---
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layout: page
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author: Domenico Votta
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category-page: advanced
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category-title: Advanced commands
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tags: compare sorted files
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title: comm
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---
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The <code>comm</code> is a command that compares two sorted files
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line by line and writes the output: the lines that are in common and the lines that are unique.<br>
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Here we have two files named <code>example1.txt</code> and
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<code>example2.txt</code> that contain 5 elements, to test this command:<br>
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<code>example1.txt</code>
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{% highlight bash linenos %}
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Icecream
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Chocolate
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Cake
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Candy
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Biscuit
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{% endhighlight %}
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<code>example2.txt</code>
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{% highlight bash linenos %}
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Bread
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Chocolate
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Tomato
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Candy
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Pizza
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{% endhighlight %}
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The syntax command is:
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<pre>
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comm [flag][file1] [file2]
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</pre>
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<pre>
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comm example1.txt example2.txt
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Icecream
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Chocolate
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Cake
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Tomato
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Candy
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Biscuit
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Pizza
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</pre>
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<ul>
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<li>The elements of the first file have less indentation.</li>
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<li>The elements of the second file have some more indentation.</li>
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<li>The elements in common have even more indentation than those of the second file.</li>
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</ul>
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<h3>Flags</h3>
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<ul>
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<li> <b>-1</b>: supress column 1</li>
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<li> <b>-2</b>: supress column 2</li>
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<li> <b>-3</b>: supress column 3</li>
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</ul>
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