[Help-bash] What are the default values of signal handles?

[Peng Yu]

Hi,

`help trap` says the following. But I'm not able to find the document
for the "original value". Does anybody know where I can find the
definitions? Thanks.

If ARG is absent (and a single SIGNAL_SPEC
    is supplied) or `-', each specified signal is reset to its original
    value.

-- 
Regards,
Peng