Lets say I wanted to wildcard directories and then wildcard all files in those directories.

How would I do so?

I know * is to wildcard all files, but I don't know how to wildcard directories.

For example pdf2djvu -o /dir/[wildcard dirs]/[wildcards.djvu] /dir/[wildcard dirs]/[wildcards.pdf]

On a secondary note can such a wildcard be affected if the location had a space where normally typing with "" for spaces it would be better to use - this time?

I tried what I posted above using the standard * for the wildcard dirs and wildcard files like /dir[entire dir had no spaces]/*/*.djvu but got the following error

I/O error (basic_ios::clear)