In perlipc:
You may also choose to assign the strings 'IGNORE' or 'DEFAULT' as the handler, in which case Perl will try to discard the signal or do the default thing.
What does it mean by "do the default thing"? Where can I get documentation on 'DEFAULT' behaviors for different signals, if any?
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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