I would like to copy all files out of a dir except for one named Default.png. It seems that there are a number of ways to do this. What seems the most effective to you?
I'd just do:
cp srcdir/* destdir/ ; rm destdir/Default.png
unless the files are big. Otherwise use e.g.
find srcdir -type f/ |grep -v Default.png$ |xargs -ILIST cp LIST destdir/