My cfg: FreeBSD

Disable .core files

sysrc dumpdev="NO"

That is for the dump that the OS (Operating System) creates when it crashes, not for the core files that individual programs create.
For stopping those, the limit (csh) or ulimit (sh) technique should work. One of the things that makes that technique a bit difficult is that these commands need to be executed in the environment of the program itself.

ulimit -c 0

limit coredumpsize 0

But overall you can:

kern.coredump=0

or reroute them by:

kern.corefile=/dev/null

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