law's questions

So, I have been tasked with researching and deploying some kind of network auditing software. All this really needs to do is be able to ping/TCP-connect-scan a handful of internal /24 networks at regular intervals (every 24h or whatever) and send out an email if a new host is discovered or if a previously-existing host has gone away. Silly-simple to implement via Perl hackery, but Bossman wants a Shiny Web Interface(tm) and doesn't really want to pay for it. I've played around a bit with Zenoss, but that seems like using a sledgehammer to swat a housefly. Do you folks know of any software that can do that? Preferably this would run on a linux box, but I'm not going to be overly-picky at this point...

Many thanks!

So, I use Systemimager to provision new CentOS 5.3 hosts via PXE. We have a couple servers that are just test targets that we'll reimage a couple-dozen times a day, and normally, getting them to PXE-boot is as simple as logging onto their iLO interfaces, rebooting, and hitting F12 at the appropriate time. My question is, is it possible to tell the server via the linux commandline to perform a "one-time PXE boot" during its next reboot? Each reimage cycle this would save me many minutes of clicking, typing, waiting for Java to load the ilo console, etc. I know Dell has this capability via OpenIPMI, but I was wondering if HP had similar functionality.

Many thanks! --Lee

Does anyone know if Postgres has a way to display query results "prettily", like how MySQL does when ending a query with \G on the command line? For instance, "select * from sometable\G" as opposed to "select * from sometable;"

Many thanks!