man 5 core

> On 12 Aug 2019, at 04:48, ToddAndMargo via users 
> <users@lists.fedoraproject.org> 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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