Disable .core files

sysrc dumpdev="NO"

That is for the dump that the OS 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.

.bash_profile

ulimit -c 0

/etc/csh.login

limit coredumpsize 0

But overall you can:

/etc/sysctl.conf

kern.coredump=0

or reroute them by:

/etc/sysctl.conf

kern.corefile=/dev/null

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