Update bash-9-scripting.md

docs/pages/bash/bash-9-scripting.md

@@ -17,7 +17,14 @@ When it will come the time to write scripts, you will have to use it extensively
 
 !!! question "Write a bash script that allows to count the number of files contained in the directory `training_unix_basics`"
 
-
+??? example "Click to show the solution"
+    ```bash
+    #!/bin/bash
+
+    directory=/home/<user_name>/training_unix_basics
+    file_count=$(ls -1 "$directory" | wc -l)
+    echo $file_count
+    ```
 
 !!! question "Write a bash script that asks for a directory name and count the number of files contained"