i've never noticed these before:
--block-signal[=SIG]
block delivery of SIG signal(s) to COMMAND
--default-signal[=SIG]
reset handling of SIG signal(s) to the default
--ignore-signal[=SIG]
set handling of SIG signal(s) to do nothing
i've not yet _needed_ them, but fyi in case anyone does. (the motivating
example in the man page is "making sure SIGPIPE actually works in a child,
regardless of the caller's signal disposition".)
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