Sum up file size for specific type of files.
$ find ./<directory_name> -print | grep -E "mp4$|wmv$|avi$|jpg$|png$|mp3$|mkv" | awk '{print "ls -l \""$0"\""}' > <tmporary_file_name>
The content of size_t_file is as below
ls -l "./<directory_name>/<subdirectory_name>/001.jpg"
ls -l "./<directory_name>/<subdirectory_name>/002.jpg"
Then
$ sh <tmporary_file_name> | awk '{total = total + $5}END{print "total is "total}'
This will count all designated type's file size and calculate the summation.
$find ./<directory_name> -print | grep -vE "mp4$|wmv$|avi$|jpg$|png$|mp3$|mkv$|JPG$|MP4$|AVI$"
The command above will omit all output which ends with motion and still picture file type. Use option "-v" for this purpose.
