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You can use this to loop any command to periodically see the output.
while true; do [YOUR COMMAND HERE]; sleep [# of seconds]; done;
Alternatively, you can put it in a simple shell script to save typing!
while true; do $1; sleep $2; done;
/path/to/script.sh "ifconfig eth0 | grep 'inet addr:'" 60
populate the auth.hosts file with a list of IP addresses that are authorized to be in use and when you run this command it will return the addresses that are pingable and not in the authorized list.
Can be combined with the "Command line Twitter" command to tweet unauthorized access.
This will create an exact duplicate image of your hard drive that you can then restore by simply reversing the "if" & "of" locations.
sudo dd if=/media/disk/backup/sda.backup of=/dev/sda
Alternatively, you can use an SSH connection to do your backups:
dd if=/dev/sda | ssh [email protected] dd of=~/backup/sda.backup