2018-11-15 16:30:55 +00:00
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---
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layout: page
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category_title: interm
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category-page: interm
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tags: tee shell command
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author: Nicola Brunner
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title: tee
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---
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<p>The <code>tee</code> command is used to split the output of a program, doing
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this the output can be displayed in the shell and in the same time written in a
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file. This is useful, for example, if we want to capture intermediate outputs of
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a long program.
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The command is named after the T-splitter used in plumbing, because they have
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similar functions.</p>
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<br>
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<h3>Usage:</h3>
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<p>The default tee command syntax is:</p>
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<pre>tee [flags] [file]</pre>
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<p>Where <code>[flags]</code> are the tee flags (below you will find more info),
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and argument <code>[file]</code> is a file or a list of files, each of which
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receives the output.</p>
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2018-11-15 17:23:46 +00:00
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<br>
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2018-11-15 16:30:55 +00:00
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<h3>Flags:</h3>
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<p>The most common flags of tee are:</p>
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<ul>
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<li><code>-a</code> Appends the output to each file, rather than overwriting it.</li>
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<li><code>-i</code> Ignores interrupt signals.</li>
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</ul>
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2018-11-15 17:23:46 +00:00
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<br>
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2018-11-15 16:30:55 +00:00
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<h3>Example:</h3>
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<pre>date | tee example.txt</pre>
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<p>Basically, with this example, we can see that tee writes the date in
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example.txt, but shows also the output (in this case the date) in the shell.
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If you wouldn’t your file be overwritten every time you use this command,
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you should use <code>-a</code> that appends the output to the file.</p>
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