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    # bitfield format: xxxMMMxx

my @msgs = ( 'a' .. 'i' );
my $msg = $msgs[ ( $bitfield >> 2 ) && 7 ];
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    bit15         bit0
|                |
...
C = Core dumped?
S = Signal that caused program to exit
E = Process's exit code.
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    $core_dumped = ($? >> 15) & 1;
$signal      = ($? >> 8) & 127;
$exit_code   = $? & 255