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# sed 's/.*\([0-9]\{8\}\).*/\1/' infile
20070818
20070818
20070820
20070820

Assuming standard formatting:


# echo "YUENLONG_20070818.DMP" | nawk -F"[_\.]" '{print $2}'
20070818


or if you know these are the only numerics, but position may be an issue:


# echo...

-exec of find and xargs expect an executable, a command, not a shell script function afaik. So maybe you assign the output of the find to some variable and hand it over as positional parameter for...