From 1c8870ece41f149133163174d6cec24743838f3a Mon Sep 17 00:00:00 2001
From: koalaman <vidar@vidarholen.net>
Date: Sat, 17 May 2014 10:55:32 -0700
Subject: [PATCH] Created SC2143 (markdown)

---
 SC2143.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 SC2143.md

diff --git a/SC2143.md b/SC2143.md
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+## Instead of [ -n $(foo | grep bar) ], use  foo | grep -q bar .
+### Problematic code:
+
+    if [ "$(find . | grep 'IMG[0-9]')" ]
+    then
+      echo "Images found"
+    fi
+
+### Correct code:
+
+    if find . | grep -q 'IMG[0-9]'
+    then
+      echo "Images found"
+    fi
+
+### Rationale:
+
+The problematic code has to iterate the entire directory and read all matching lines into memory before making a decision. 
+
+The correct code is cleaner and stops at the first matching line, avoiding both iterating the rest of the directory and reading data into memory.
+
+### Contraindications
+
+None.
\ No newline at end of file