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my $ret = system(executable);

perl -e "..."

#include "stdio.h"
...
    return 0;
}

#!/usr/bin/perl
use strict;
...
exit $rc>>8;

D:\rcs>perl rcs.pl 0

...
Hello World!
Returning with code -1
i = -10

my $rc = system ("$cmd");

my $rc = system ($cmd);

my $rc = system $cmd;