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Watch out if you have several USB drives plugged in: it scans the whole /media/ folder !!! You can replace /media/ by the path of a specific USB drive (something like /media/F77A-530B/)
I use a sound recorder and I want to plug the recorder and grab the most recent sound.
That's what this command does.
Use mv instead of cp to move instead of copy.
Change *.wav to the required file type.
search the newest *.jpg in the directory an make a copy to newest.jpg. Just change the extension to search other files. This is usefull eg. if your webcam saves all pictures in a folder and you like the put the last one on your homepage. This works even in a directory with 10000 pictures.