updated notes

src/rhcsa.md

@@ -291,7 +291,18 @@ sudo systemctl start myapp
 sudo systemctl start myapp.timer
 ```
 
+## Bash Scripting
 
+### Basic Script
+```bash
+nano myscript.sh
+```
+
+> Note: Shebang is the first line of the script that tells the system which interpreter to use.
+```bash
+#!/bin/bash
+echo "Hello, World!"
+```