http://www.perlmonks.org?node_id=345747


in reply to Re: Capturing return value and STDOUT from system like calls
in thread Capturing return value and STDOUT from system like calls

from system: 
    $exit_value  = $? >> 8;
    $signal_num  = $? & 127;
    $dumped_core = $? & 128;

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In Section Seekers of Perl Wisdom