How to find out which application(s) created core dumps? I have a friend who has a Mac (Mojave) that recently ran out of space. I found that the space was being used by files in the /cores folder. I deleted them and used to the command sudo launchctl limit core 0 0 to turn off the creation of the files. But somehow the crash dump got turned back on and the HDD was full again. Now I'm curious as to what created the core dump. 

How do a go about reading a core.xxx file when I don't know which program is crashing? 

Can I identify the crashing application from the core dump?
The handling of coredumps has changed on Mojave, so you cannot use "otool -c" as you did on older macOS versions. Instead you open the Terminal and run the following command:

lldb -c /cores/core.12345


where 12345 needs to be replaced by the actual filename of your coredump file.

When lldb has started up, you'll get an (lldb) prompt, where you enter the following command:

target list


Then you should be shown which program crashed. For example like this:

(lldb) target list
Current targets:
* target #0: /usr/local/bin/emacs ( arch=x86_64-*-*, platform=host, state=stopped )


In this case the crashed program was "emacs" in the folder /usr/local/bin.