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  1. or download this
    #!/usr/bin/perl
use strict;
...
open $fh, "<", \"/etc/passwd" or die; doit_read $fh;
open $fh, "<",  "/etc/passwd" or die; doit_sysread $fh;
open $fh, "<",  "/etc/passwd" or die; doit_read $fh;
  2. or download this
    <sysread><UNDEF><>
<read><5></etc/>
<sysread><5><jrw32>
<read><5><jrw32>