#! perl
use strict;
use warnings;

my @carslist = qw(DATSUN_BLUE TOYOTA_MAROON ELANTRA_YELLOW);
my %cars;

for (@carslist)
{
    unless (exists $cars{$_})
    {
        my $file = 'tmp/' . $_ . '.txt';
        open(my $fh, '>', $file)
            or die "Cannot open file '$file' for writing: $!";
        $cars{$_} = $fh;
    }
}

my $pattern = join '|', @carslist;
   $pattern = qr/$pattern/;
my @strings;

while (<DATA>)
{
    chomp;
    my @fields = split;

    if (($fields[1] eq '1'  ||
         $fields[1] eq '0') &&
         /$pattern/)
    {
        push @strings, $_;

        print { $cars{$fields[4]} } $fields[0], ',', $fields[4], "\n"
            if /engineer/ && !/,-,/;
    }
}

for (@carslist)
{
    close $cars{$_}
        or die "Cannot close file '$_': $!";
}

print "Strings:\n";
print "$_\n" for @strings;

__DATA__
1250 1 engineer office DATSUN_BLUE office 67 page30 text
1500 1 billing office MERCEDES_TAN office 98 page 40 txt
1500 7 billing office JAGUAR_BLACK office 98 page 40 txt
1250 0 engineer office ELANTRA_YELLOW office 66 page50 txt
1250 1 engineer office DATSUN_BLUE office 67 page30 text