ToddAndMargo via users writes:
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
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'
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
$ cat ~/bin/core
exec coredumpctl -o core dump
And after something dumps core, I just execute "core", and the core file
appears in my current directory.