Fixed an important detail. Other minor fixes.

_posts/2018-10-02-automatic-removable-media-synchronization.md

@@ -1,7 +1,7 @@
 ---
 title: Automatic synchronization of media files from SD cards
 tags: [sync, rsync, media, files, automatic]
-updated: 2018-10-02 12:00
+updated: 2018-10-17 23:36
 description: Automatic synchronization of media files from a removable block device such as an SD card
 ---
 
@@ -101,9 +101,9 @@ gist](https://gist.github.com/jvhaarst/2343281) which was put
 in the public domain. 
 
 ```shell
-#!/bin/sh
+#!/bin/bash
 
-# auto_media_backup .sh
+# auto_media_backup.sh
 #
 # Copyright (C)  2018  Franco Masotti <franco.masotti@live.com>.
 # Permission is granted to copy, distribute and/or modify this document
@@ -113,12 +113,15 @@ in the public domain.
 # A copy of the license is included in the section entitled "GNU
 # Free Documentation License".
 
+# Put the full path if you are calling the script from a different directory.
 . ./auto_media_backup.conf
 
 # Check that all the software is installed.
+# All the tools used in this script should be pretty standard.
 check_tools()
 {
     which \
+bash \
 mail \
 lsblk \
 grep \