How to make linux core dump file being over written each time?

Question

I'm not using core_pattern, but I'm creating the core file under current directory, named "core". I found when there's a new crash, the core file is not overwritten, unless I manually delete the old core file, and crash will generate a new one.

Question: is there a way to make core file being overwritten, any system level trigger on this?

Thanks.

Answer 1

Core pattern is the way you control the names of the core. (Not sure why you aren't using it)

This pattern will overwrite the core files in pwd The name will always be "core"

echo core% > /proc/sys/kernel/core_pattern