#!/usr/bin/perl -w


my %bad;
while (<DATA>) {
    if (/checking image file \<(NT-Development_\d+_FULL)\>/) {
        my $file = $1; # in case you ever change the regex below to have brackets
        do {
	    $_ = <DATA>;
            $bad{$file}++ if /media does not exist/;
        } until /checking files file/;

    }
}

print join "\n", keys %bad;
__DATA__
checking image file <NT-Development_1024371283_FULL>
>copy 1 frag 1 media CC0202 host netbackup2: media does not exist
>copy 1 frag 2 media CC0202 host netbackup2: media does not exist
>copy 1 frag 3 media CC0202 host netbackup2: media does not exist
>copy 1 frag 4 media CC0202 host netbackup2: media does not exist
>copy 1 frag 5 media CC0202 host netbackup2: media does not exist
checking files file <NT-Development_1024371283_FULL.f>

checking image file <NT-Development_1026371283_FULL>
checking files file


checking image file <NT-Development_10243744283_FULL>
>copy 1 frag 1 media CC0202 host netbackup2: media does not exist
>copy 1 frag 2 media CC0202 host netbackup2: media does not exist
checking files file <NT-Development_1024374483_FULL.f>
__END__