Is /etc/rc.conf scriptable?

Hi list,

I'm trying to do something to make rc.conf can act conditionally

What I want is:

1. List the wireless access points,

grep if there is one which bssid is 'bb:bb:bb:bb:bb:bb',

if there is, then set ifconfig_wlan0 to the value:

    "inet 192.168.1.111 netmask 255.255.255.0 WPA"

2. check if bitlbee has been installed, if so, then let bitlbee
service start.

So I tried with following settings in rc.conf, but all of them failed,
i.e., the networking can't be connected and bitlbee service doesn't
run.

/etc/rc.conf

if ifconfig wlan0 list scan 2>/dev/null | grep -q 'bb:bb:bb:bb:bb:bb' >/dev/null 2>&1; then
    ifconfig_wlan0="inet 192.168.1.111 netmask 255.255.255.0 WPA"
fi
if [ -x /usr/local/sbin/bitlbee ]; then
    bitlbee_enable="YES"
fi

My question is, how to achieve what I want? The simpler, the better :)

-- 
Regards,
Yue Wu

Key Laboratory of Modern Chinese Medicines
Department of Traditional Chinese Medicine
China Pharmaceutical University
No.24, Tongjia Xiang Street, Nanjing 210009, China
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