grep trick

Small hint shown to me many years ago when enabling things in rc.conf.
If I want to startup ipfilter for example (trimmed to avoid wrapping).

bash-2.05b# cat /etc/defaults/rc.conf | grep ^ipfilter

Returns the following,
ipfilter_enable="NO" # Set to YES to enable ipfilter
ipfilter_program="/sbin/ipf" # where the ipfilter program lives
ipfilter_rules="/etc/ipf.rules" # rules definition file for ipfilter,
ipfilter_flags="" # additional flags for ipfilter

If it looks like what you want then write it into your running rc.conf,

cat /etc/defaults/rc.conf | grep ^ipfilter >> /etc/rc.conf

Then you can edit to enable, add flags, etc. Cures the typos.

DAve
http://lists.freebsd.org/pipermail/freebsd-questions/2007-December/165704.html