-open(IN, "$ARGV[0]") || die "** Failed to open $ARGV[0]: $!\n";
-open(OUT, ">eximdir/exim") || die "** Failed to open eximdir/exim: $!\n";
+open(IN, $ARGV[0]) || die "** Failed to open $ARGV[0]: $!\n";
+open(OUT, '>eximdir/exim') || die "** Failed to open eximdir/exim: $!\n";