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  1. or download this
    #!/usr/bin/perl
use warnings;
...
}

sub quit{close $pid; exit}
  2. or download this
    open PROC, "| c:/gnuplot/bin/gnuplot.exe" || die "Could not start gnup
+lot: $!";
#above :the first character in the filename is a pipe symbol (|)
...
}
print PROC "e\n";
close PROC;