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  1. or download this
    
  -e $F or return 0;   # File exists?
  -f $F or return 0;   # It's a plain file?
  2. or download this
    $ mkdir test
$ mkdir test/file1.txt
...
test/file2.txt: EXISTS PLAIN 
test/file3.txt: EXISTS PLAIN 
test/file4.txt: EXISTS PLAIN