How can you move (or copy) all files of a certain type to a directory in Unix?

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http://unix.stackexchange.com – I'm not very familiar with all the tricks of grep/find/awk/xargs quite yet. I have a particular file type say *.xxx, in random places throughout a certain directory. How can I find all such files, and move them to a folder in my home directory on Unix (that may not exist yet)? (HowTos)