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<link rel="alternate" lang="en" xml:lang="en" title="split a file by keyword" type="text/html" hreflang="en" href="/Scratch/en/blog/2010-02-18-split-a-file-by-keyword/" />
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split a file by keyword
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<p>Strangely enough, I didn’t find any built-in tool to split a file by keyword. I made one myself in <code>awk</code>. I put it here mostly for myself. But it could also helps someone else.
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The following code split a file for each line containing the word <code>UTC</code>.</p>
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<div><pre class="twilight">
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<span class="Comment"><span class="Comment">#</span>!/usr/bin/env awk</span>
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<span class="Entity">BEGIN</span>{i=0;}
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<span class="StringRegexp"><span class="StringRegexp">/</span>UTC<span class="StringRegexp">/</span></span> {
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i+=1;
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FIC=<span class="SupportFunction">sprintf</span>(<span class="String"><span class="String">"</span>fic.%03d<span class="String">"</span></span>,i);
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}
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{<span class="SupportFunction">print</span> <span class="Variable"><span class="Variable">$</span>0</span>>>FIC}
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</pre></div>
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<p>In my real world example, I wanted one file per day, each line containing UTC being in the following format:</p>
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<pre class="twilight">
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Mon Dec 7 10:32:30 UTC 2009
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</pre>
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<p>I then finished with the following code:</p>
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<div><pre class="twilight">
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<span class="Comment"><span class="Comment">#</span>!/usr/bin/env awk</span>
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<span class="Entity">BEGIN</span>{i=0;}
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<span class="StringRegexp"><span class="StringRegexp">/</span>UTC<span class="StringRegexp">/</span></span> {
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date=<span class="Variable"><span class="Variable">$</span>1</span><span class="Variable"><span class="Variable">$</span>2</span><span class="Variable"><span class="Variable">$</span>3</span>;
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<span class="Keyword">if</span> ( date != olddate ) {
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olddate=date;
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i+=1;
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FIC=<span class="SupportFunction">sprintf</span>(<span class="String"><span class="String">"</span>fic.%03d<span class="String">"</span></span>,i);
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}
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}
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{<span class="SupportFunction">print</span> <span class="Variable"><span class="Variable">$</span>0</span>>>FIC}
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<a href="/Scratch/en/blog/2010-02-16-All-but-something-regexp--2-/"><span class="nicer">«</span> Pragmatic Regular Expression Exclude (2)</a>
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Created: 02/18/2010
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Modified: 05/09/2010
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Entirely done with
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<a href="http://www.vim.org">Vim</a>
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and
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<a href="http://nanoc.stoneship.org">nanoc</a>
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