grep BLOCK LIST
grep EXPR,LIST

##</code><code>##

grep ': FAIL' $logFile

##</code><code>##

open my $fh, '<', $logFile or die $!;
my $status = grep /: FAIL/, <$fh>;
# or
my $status = grep { -1 != index $_, ': FAIL' } <$fh>;

##</code><code>##

my $status = system 'grep', ': FAIL', $logFile;