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  1. or download this
    my $cmd = 'echo "Hello World" && exit 2';
my $sys_result = system($cmd);
...

my $qx_result = `$cmd`;
print "qx// returned `$qx_result'; \$? = $?\n";
  2. or download this
    Hello World
System returned `512'; $? = 512
qx// returned `Hello World
'; $? = 512