What is the file /root/core for?

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I installed Bananian 15.01 on my Banana Pi. In the directory /root I found the file core. What is the purpose of this file?

Thanks in advance.

This is the result of a core dump. Something crashed and left this over. You can try to analyze it ('gdb -c /root/core') or delete it.

In case this happens often then it's a good idea to define a 'core area' as outlined in the link above: sysctl -w "kernel.core_pattern=/var/cores/%h-%e-%p.core"

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