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  1. or download this
    grep BLOCK LIST
grep EXPR,LIST
  2. or download this
    grep ': FAIL' $logFile
  3. or download this
    open my $fh, '<', $logFile or die $!;
my $status = grep /: FAIL/, <$fh>;
# or
my $status = grep { -1 != index $_, ': FAIL' } <$fh>;
  4. or download this
    my $status = system 'grep', ': FAIL', $logFile;