From ffebea16e14fec5e1793469c9830485efdf0758b Mon Sep 17 00:00:00 2001
From: Daniel Heater <dheater@users.noreply.github.com>
Date: Fri, 19 Apr 2019 10:01:53 -0500
Subject: [PATCH] Add example for testing equality

---
 SC2039.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/SC2039.md b/SC2039.md
index 8b943a2..f0cbff6 100644
--- a/SC2039.md
+++ b/SC2039.md
@@ -23,6 +23,26 @@ a="$(printf '%b_' ' \t\n')"; a="${a%_}" # protect trailing \n
 
 Want some good news? See http://austingroupbugs.net/view.php?id=249#c590.
 
+### Testing Equality
+
+`==` operator is not supported in POSIX `sh`
+
+Bash:
+
+```Bash
+if [ "$a" == "$b" ]; then
+    echo "equal"
+fi
+```
+
+POSIX:
+
+```sh
+if [ "$a" -eq "$b" ]; then
+    echo "equal"
+fi
+```
+
 ### `$"msgid"`
 
 Bash: