From 920d16436e0d5f37e9f6d31236ee87b716f3c82f Mon Sep 17 00:00:00 2001
From: johannst <johannst@users.noreply.github.com>
Date: Thu, 25 Jan 2024 07:33:01 +0000
Subject: deploy: f7fb4c7303a5776ddb421d182a92f679a8b0f868

---
 print.html | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'print.html')

diff --git a/print.html b/print.html
index 1c0030a..99c9581 100644
--- a/print.html
+++ b/print.html
@@ -335,6 +335,13 @@ echo ${(kv)vec}       # a aa b bb
 # Iterate over key value pairs.
 for k v in ${(kv)vec)}; do ...; done
 </code></pre>
+<h2 id="io-redirections"><a class="header" href="#io-redirections">I/O redirections</a></h2>
+<p>See <a href="tools/bash.html#io-redirection">bash - I/O redirection</a></p>
+<h2 id="process-substitution"><a class="header" href="#process-substitution">Process substitution</a></h2>
+<p>Process substitution allows to redirect the stdout of multiple processes at
+once.</p>
+<pre><code class="language-bash">vim -d &lt;(grep foo bar) &lt;(grep foo moose)
+</code></pre>
 <h2 id="argument-parsing-with-zparseopts"><a class="header" href="#argument-parsing-with-zparseopts">Argument parsing with <code>zparseopts</code></a></h2>
 <pre><code class="language-zsh">zparseopts [-D] [-E] [-A assoc] specs
 </code></pre>
@@ -589,6 +596,11 @@ contains some nice visualization to explain bash redirections.</p>
 <li>duplicate <code>fd 1</code> to <code>fd 2</code>, effectively redirecting <code>stderr</code> to <code>stdout</code></li>
 <li>redirect <code>stdout</code> to <code>file</code></li>
 </ol>
+<h2 id="process-substitution-ref"><a class="header" href="#process-substitution-ref">Process substitution (<a href="https://tldp.org/LDP/abs/html/process-sub.html">ref</a>)</a></h2>
+<p>Process substitution allows to redirect the stdout of multiple processes at
+once.</p>
+<pre><code class="language-bash">vim -d &lt;(grep foo bar) &lt;(grep foo moose)
+</code></pre>
 <h2 id="argument-parsing-with-getopts"><a class="header" href="#argument-parsing-with-getopts">Argument parsing with <code>getopts</code></a></h2>
 <p>The <code>getopts</code> builtin uses following global variables:</p>
 <ul>
@@ -773,6 +785,10 @@ echo &quot;ls output: &quot;(ls)
 <pre><code class="language-sh"># 'noclobber', fail if 'log' already exists
 echo foo &gt;? log
 </code></pre>
+<h3 id="process-substitution-1"><a class="header" href="#process-substitution-1">Process substitution</a></h3>
+<p>Redirect output of multiple processes. Same as <code>&lt;(..)</code> in bash.</p>
+<pre><code class="language-sh">diff (sort a | psub) (sort b | psub)
+</code></pre>
 <h2 id="control-flow"><a class="header" href="#control-flow">Control Flow</a></h2>
 <h3 id="if--else"><a class="header" href="#if--else"><code>if</code> / <code>else</code></a></h3>
 <pre><code class="language-sh">if grep foo bar
-- 
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