!remove
/^[^:]*:[^:]*:[^:]*:[^#]*#NETFINITY$/d
 
!install
/^[^:]*:[^:]*:[^:]*:[^#]*#NETFINITY$/d

# inserting the entry before the last line!
$i\
netf:3456:once:/usr/bin/netfinity/netfinity >/dev/console 2>&1 #NETFINITY



