my $command_line = "";
my $first_build = "hi.bld";
my @other_builds = qw( low.bld hello.bld cow.bld );
$command_line = "c:\\execu $first_build";
$command_line .= " " . shift @other_builds while (@other_builds);
$command_line .= " file.c";
print "$command_line\n";
system "$command_line\n";