On 8/12/19 8:25 AM, ToddAndMargo via users wrote:
> Hi All,
>
> I have no idea what this tells me
>
>     $ cat /proc/sys/kernel/core_pattern
> |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e
>
> Does anyone know of a list somewhere?
>
> And why does it send out a pipe symbol?
>
>
> What does this do?
>
>      # echo core > /proc/sys/kernel/core_pattern
>
> Will "core" turn on core dumps?
>
> And if so, how do I turn it back off after testing it?
>
> And will it wipe out "%P %u %g %s %t %c %h %e"?
>
>
> I am confused,

Have a look at https://sigquit.wordpress.com/2009/03/13/the-core-pattern/

Doing the procedures there will create a core file in the specified directory 
and bypass
the "systemd" method implemented in fedora.

As for fedora.  The pipe causes the core file to be used as input to 
systemd-coredump.

A "man systemd-coredump" would be a good place to start.

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