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Which signal can't be overridden in linux?

marked as duplicate by Anthony Geoghegan, JdeBP, RalfFriedl, Jeff Schaller, Arkadiusz Drabczyk Dec 9 '18 at 19:39

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    SIGKILL (9) for example. – Isaac Dec 9 '18 at 17:13
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    The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. - from man 7 signal. – Arkadiusz Drabczyk Dec 9 '18 at 17:14
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From man 7 signal:

The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.

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