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  1. or download this
    #include <stdio.h>

main()
...
sleep(10);
return 0;
}
  2. or download this
    #!/usr/local/bin/perl
use strict;
use warnings;
...
}

exit main();
  3. or download this
    % perl -w system2.pl
return value = '2'
No error text!
...
STDERR: 'sh: Syntax error: word unexpected (expecting ")")
'
%