commit 8ba5ad020384cba1687cf524a9d354292311f186
Author: Stephan <accounts@janeemussja.de>
Date:   Mon Nov 20 22:56:09 2023 +0100

    Added snippet check_folder_for_extension.sh

diff --git a/check_folder_for_extension.sh b/check_folder_for_extension.sh
new file mode 100755
index 0000000..068484e
--- /dev/null
+++ b/check_folder_for_extension.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+## Checks given folder for files with certain extensions. Subfolders are checked recursively. 
+## $1 Folder to check.
+## $2 space separated list of extensions to check for. e.g.: "*.jpg *.JPG *.mp4 *.MP4".
+## returns Count of files found with the desired extension.
+
+__check_folder() {
+	local _FOLDER=$1;
+	local _EXTENSIONS=$2;
+	local _FILE_C=0;
+	if [ -d "$_FOLDER" ]; then	# is a folder
+		local _ITEM="";
+		local _FC=${#FILESNPATHS[@]};
+		pushd "$_FOLDER" 1>/dev/null;
+		for _ITEM in ${_EXTENSIONS}; do # lookup all files with the desired extensions
+			if [[ -f "$_ITEM" ]]; then # is a file
+				FILESNPATHS[$_FC]="$(pwd)/$_ITEM";
+ 				((_FC+=1));
+ 				((_FILE_C+=1));
+			fi
+		done
+		# check subfolders if exist
+		local _SUBFOLDERS="$(/usr/bin/ls . 2>/dev/null)";
+		local _CNT=0;
+		for _SUBITEM in ${_SUBFOLDERS}; do
+			if [[ -d "$_SUBITEM" ]]; then
+				__check_folder "$_SUBITEM" "$_EXTENSIONS";
+				_CNT=$?
+				((_FILE_C+=_CNT));
+			fi
+		done
+		popd 1>/dev/null;
+	fi
+	return $_FILE_C
+}
+
+
+__test() {
+	MYFOLDER="./test";
+	__check_folder $MYFOLDER "*.jpg *.JPG *.mp4 *.MP4"
+	FILE_COUNT=$?
+	echo "Found $FILE_COUNT files in folder $MYFOLDER, length of files array is ${#FILESNPATHS[*]}.";
+	for ((FILE_C=0;FILE_C<${#FILESNPATHS[*]};FILE_C++)); do
+		echo "$FILE_C  ${FILESNPATHS[$FILE_C]}";
+	done
+}
+
+declare -A FILESNPAHTS;
+
+__test