Re: I need help understanding /proc/sys/kernel/core_pattern

[Andy Paterson]

man 5 core
> On 12 Aug 2019, at 04:48, ToddAndMargo via users  wrote:
> > On 8/11/19 6:01 PM, Sam Varshavchik wrote:
> > ToddAndMargo via users writes:
> > > 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?
> >
> > Would you believe the proc manual page, which directs you to the core manual page?
> > > And why does it send out a pipe symbol?
> >
> > To indicate that the core file is an external program.
> > > What does this do?
> > >  # echo core > /proc/sys/kernel/core_pattern
> > >
> > > Will "core" turn on core dumps?
> >
> > The core dumps are already turned on, except that they are fed to abrt, which stashes them away. This will, instead, create a plain file called "core" in the executable's directory.
> > > 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"?
> >
> > Set it back to what it was.
> > echo '|/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e'  >/proc/sys/kernel/core_pattern
> > Now, if you really want a core file, you don't really have to do any of that. You can leave core_pattern at its default value, and just pull the core file down, upon demand. I have a small shell script in my $HOME/bin directory:
> > $ cat ~/bin/core
> > #!/bin/bash
> > exec coredumpctl -o core dump
> > And after something dumps core, I just execute "core", and the core file appears in my current directory.
>
> Thank you!
>
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