From 5434bc900ac6ae024520c33e45623c072e34ff82 Mon Sep 17 00:00:00 2001
From: koalaman <vidar@vidarholen.net>
Date: Sat, 8 Feb 2014 10:42:49 -0800
Subject: [PATCH] Created SC2006 (markdown)

---
 SC2006.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 SC2006.md

diff --git a/SC2006.md b/SC2006.md
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+# Use $(..) instead of deprecated `..`
+
+### Problematic code:
+
+    echo "Current time: `date`"
+
+### Correct code:
+
+    echo "Current time: $(date)"
+
+### Rationale:
+
+Backtick command substitution `` `..` `` is legacy syntax with several problems.
+
+1. It has a series of undefined behaviors related to quoting in POSIX.
+1. It imposes a custom escaping mode with surprising results.
+1. It's exceptionally hard to nest. 
+
+`$(..)` command substitution has none of these problems, and is therefore strongly encouraged.
+
+### Contraindications
+
+None.
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