Rather than entering each file by name, using wildcards in the Source path allows you to collect all files of a certain type within one or more directories, or many files from many directories. When specifying file names (or paths) in Microsoft Windows and Unix-like operating systems, the asterisk character (*) substitutes for any zero or more characters, and the question mark (?) substitutes for any one character.
Specifying Paths to collect from
When using wildcards in paths for file collections:
*is a simple, non-recursive wildcard representing zero or more characters which you can use for paths and file names.
**is a recursive wildcard which can only be used with paths, not file names.
- Multiple recursive expressions within the path are not supported.
So, for example:
/var/log/**will match all files in /var/log and all files in all child directories, recursively.
/var/log/**/*.logwill match all files whose names end in .log in /var/log and all files in all child directories, recursively.
/home/*/.bashrcwill match all .bashrc files in all user's home directories.
/home/*/.ssh/**/*.keywill match all files ending in .key in all user's .ssh directories in all user's home directories.