quick break and continue example

advanced/learning_bash_scripting.md

@@ -1139,7 +1139,74 @@ waldek@debian:~$
 
 ## `break` and `continue`
 
-TODO
+When we consider the `secret.sh` password checker we made, we have a problem.
+The program always exits, either with a success code `0` or with an error of `1`.
+In order to *break* a loop conditionally we need a new keyword, `break`.
+I rewrote the same script but with a more logical flow of operation.
+
+```bash
+#!/bin/bash
+
+secret="test123"
+tries=3
+
+while true; do
+	read -s -p "your password please: " password
+	if [[ $password == $secret ]]; then
+		echo "access granted!"
+		break
+	else
+		(( tries-- ))
+		if [[ $tries -eq 0 ]]; then
+			echo "access denied!"
+			exit 1
+		fi
+		echo "wrong password, you have $tries left..."
+	fi
+done
+
+echo "we're in!"
+echo "the code keeps on flowing..."
+```
+
+`continue` is very similar to `break`.
+It *breaks* the current iteration and **continues** to the next cycle.
+Consider the example below.
+
+```bash
+#!/bin/bash
+
+counter=0
+value=0
+
+while [[ $counter -lt 100 ]]; do
+	if (( $counter % 2 )); then
+		echo "$counter is even"
+		random=$(( $RANDOM % 20 ))
+		echo "adding $random to the counter"
+		counter=$(( $random + $counter ))
+		echo "and I'll loop again"
+		continue
+	fi
+	echo "incrementing $counter by just one..."
+	(( counter++ ))
+done
+```
+
+# Functions - Reuse code to make life easier.
+
+## defining a function
+
+## function arguments
+
+## global vs local variable
+
+## return values
+
+## the `command` builtin
+
+[Ryan's tutorials](https://ryanstutorials.net/bash-scripting-tutorial/bash-functions.php)
+
 
 # Coding challenge - pipe or argument plus action!
 
@@ -1247,20 +1314,6 @@ done
 
 </details>
 
-# Functions - Reuse code to make life easier.
-
-## defining a function
-
-## function arguments
-
-## global vs local variable
-
-## return values
-
-## the `command` builtin
-
-[Ryan's tutorials](https://ryanstutorials.net/bash-scripting-tutorial/bash-functions.php)
-
 # Coding challenge - Student reports
 
 With the [following](../assets/scores.csv) file write me a program that prints: