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It's because the exit code, signal number and core dump flag are all rolled up into a word i.e. a single 16 bit, value - the bitwise operators are used to extract the various bits of the word.
Note, also, that just because a process exits with a non-zero signal, it doesn't necessarily mean that a core dump will have been generated as the process exited.
A user level that continues to overstate my experience :-))
In reply to Re^3: What means: exit_value , signal_num and dumped_core
by Bloodnok
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