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try
    {
...
    {
      System.out.println( ioerr.toString() );
    }

open(FH,"myFile.txt") or die "Nope : $!\n";

die "Nope : $!\n" unless open(FH,"myFile.txt");

if (not open FH, 'myFile.txt')
{
    print STDERR "Nope : $!\n";
    exit;
}

!open FH => 'myFile.txt' == 0 && die "Nope : $!\n";