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  1. or download this
    src]$ mkdir empty; cd empty; touch {a,b,c}.{a,b,c}
    empty]$ echo foo > d.d
    ...
    empty]$ ls
    d.d
    empty]$
    
  2. or download this
    empty]$ perl -e'unlink grep -f && !-s _, @ARGV' *.*
    
  3. or download this
    empty]$ perl -e'unlink grep !-s, @ARGV' *.*