0: device type
1: serial
cat /proc/cpuinfo | grep -i "^Serial" | head -1 | sed "s/[^:]*:[ ]*//"
cat /proc/cpuinfo | grep -i "^Revision" |head -1 | sed "s/[^:]*:[ ]*//"
cat /proc/cpuinfo | grep -i "^Hardware" | head -1 | sed "s/[^:]*:[ ]*//"
2: mac
cat /sys/class/net/eth0/address
3: disk
4: additional (hostname)
cat /proc/sys/kernel/hostname