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  1. or download this
    use IO::Handle;
open my $f, '/tmp' or die $!;
$f->sync or die "fsync: $!\n";
  2. or download this
    use IO::Handle;
my $f = IO::Handle->new;
opendir $f, '/tmp' or die $!;
$f->sync or die "fsync: $!\n";
  3. or download this
    #include <unistd.h>
#include <stdlib.h>
...
    }
    return 0;
}