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  1. or download this
    bash-2.03$ ls -l DIR/
total 4
...
bash-2.03$ 
bash-2.03$ ./testFNI.pl  DIR/
./testFNI.pl : ILLEGAL FILE NAME in DIR [rm -f .]
  2. or download this
    #!/usr/local/bin/perl -w
use strict;
...
my $dir = shift;
if ( !$dir ) { die "usage : $0 <dir>\n"; }
illegalFile ($dir);