xargs argument replacement

This is how xargs works:

cat listfile | xargs ls 

but if you want to use the argument in the middle, such as "mv", you need to do the following:

cat listfile | xargs -I {} mv {} trash

-I {} tells xargs to replace all instances of {} with the argument from listfile.

So you can use other weird strings as long as you know it does not appear in the listfile, such as

cat listfile | xargs -I HAHA mv HAHA trash