You have a small typo. I guess you meant this:

cd /your/old/dir/
cp `grep -rl 'NNNN' *` /your/new/dir/
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If one needs another solution for any reason, there is always a for loop:

for file in `grep -rl 'NNNN' *` ; do cp $file dstdir/ ; done
[download]

Also, this will find files that contain match. Use "-L" in grep, if you want those files which do not contain match.

Leonid Mamtchenkov aka TVSET