> Eh actually no, matthew green just pointed out that /usr might be on nfs
> and when that's the case /usr is not available.  Seems that I've to create
> a script that doesn't use awk and grep.

i think you can do "if [ $(mount -t nfs) ]; ...".

btw, i think that it's hard to generate a single script which
covers all situations.
how about just loading another config file,
say, /etc/defaults/pf.boot.conf,
and allow admins who don't like it have their own /etc/pf.boot.conf?

YAMAMOTO Takashi