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  1. or download this
    # use -r if you want to process recursively
    grep -L 'N\+' your_directory | xargs cp --target-directory wherever
    
  2. or download this
    perl -MFile::Find::Rule -le 'print for find(file =>
    grep => qr/(?!N\+)/, in => @ARGV)' sourcedir | xargs \
    cp --target-directory wherever