I'm looking for a pdf I know is in a directory (Downloads) but not sure since when and there are hundred of others which make the search uncomfortable and time consuming. Not if you can do this...

Pavlos Savvidis told me of a joke in the Korean mountains: you have to know how to ask, and the illustration of this is the following joke:

Fabrice: make me a quick linux bash script (viewpdfs) to put in a directory the first page of all pdf documents in the current directory converted in png and with a watermark of the filename

rok: