[root@ rules.d]# cat 99-superuser.rules
ACTION=="remove", KERNEL=="fw*1", SUBSYSTEM=="firewire", RUN+="/root/remove.bash"
ACTION=="add", KERNEL=="fw*1", SUBSYSTEM=="firewire",RUN+="/root/add.bash"

[root@ rules.d]# cat /root/remove.bash
#!/usr/bin/bash
nslookup superuser.com 8.8.8.8 >> /root/udev.log 2>&1

[root@ rules.d]# cat /root/udev.log
;; connection timed out; no servers could be reached

[root@dmitr rules.d]# nslookup superuser.com 8.8.8.8
Server:     8.8.8.8
Address:    8.8.8.8#53
Non-authoritative answer:
Name:   superuser.com
Address: 151.101.1.69