From b3e81e0da9262779436a7e28fe6c846b0a0274c1 Mon Sep 17 00:00:00 2001
From: xvazquezc <xvazquezc@users.noreply.github.com>
Date: Fri, 5 Jul 2019 15:30:00 +1000
Subject: [PATCH] upper/lowercase manipulation

---
 bash.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/bash.md b/bash.md
index 8f63f0e2c..ab61a3a38 100644
--- a/bash.md
+++ b/bash.md
@@ -199,6 +199,19 @@ comment
 
 | `${#FOO}` | Length of `$FOO` |
 
+### Manipulation
+
+```bash
+STR="HELLO WORLD!"
+echo ${STR,}   #=> "hELLO WORLD!" (lowercase 1st letter)
+echo ${STR,,}  #=> "hello world!" (all lowercase)
+
+STR="hello world!"
+echo ${STR^}   #=> "Hello world!" (uppercase 1st letter)
+echo ${STR^^}  #=> "HELLO WORLD!" (all uppercase)
+```
+
+
 ### Default values
 
 | `${FOO:-val}`        | `$FOO`, or `val` if not set |