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authorjohannst <johannst@users.noreply.github.com>2020-03-17 22:48:49 +0000
committerjohannst <johannst@users.noreply.github.com>2020-03-17 22:48:49 +0000
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parent21e8db012f8c46f75e43a40da3f3e2676363c291 (diff)
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+ <h1><a class="header" href="#awk1" id="awk1">awk(1)</a></h1>
+<pre><code class="language-markdown">awk [opt] program [input]
+ -F &lt;sepstr&gt; field separator string (can be regex)
+ program awk program
+ input file or stdin if not file given
+</code></pre>
+<h2><a class="header" href="#input-processing" id="input-processing">Input processing</a></h2>
+<p>Input is processed in two stages:</p>
+<ol>
+<li>Splitting input into a sequence of <code>records</code>.
+By default split at <code>newline</code> character, but can be changed via the
+builtin <code>RS</code> variable.</li>
+<li>Splitting a <code>record</code> into <code>fields</code>. By default strings without <code>whitespace</code>,
+but can be changed via the builtin variable <code>FS</code> or command line option
+<code>-F</code>.</li>
+</ol>
+<p>Field are accessed as follows:</p>
+<ul>
+<li><code>$0</code> whole <code>record</code></li>
+<li><code>$1</code> field one</li>
+<li><code>$2</code> field two</li>
+<li>...</li>
+</ul>
+<h2><a class="header" href="#program" id="program">Program</a></h2>
+<p>An <code>awk</code> program is composed of pairs of the form:</p>
+<pre><code class="language-markdown">pattern { action }
+</code></pre>
+<p>The program is run against each <code>record</code> in the input stream. If a <code>pattern</code>
+matches a <code>record</code> the corresponding <code>action</code> is executed and can access the
+<code>fields</code>.</p>
+<pre><code class="language-markdown">INPUT
+ |
+ v
+record ----&gt; ∀ pattern matched
+ | |
+ v v
+fields ----&gt; run associated action
+</code></pre>
+
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