Bash-RandomFilesAndFolders-MD5-ContentManipulation

1. checks if this script is already running, if it's running write an error and exit
2. creates 100 random folders
3. creates 100 files in each folder with the following rules:
   • random size of 50K to 200K
   • random file-name prefix of a, b or c
   • random content of a-z, A-Z, 0-9, ' ' (space)
4. for each file in each folder, remove all spaces in a file
5. for each file in each folder, create .md5 file
6. if any of the steps above fails, exit and write an email