IPMITool is a tool to communicate with BMCs (such as HP and Sun iLOM's and Dell iDracs) via the Intelligent Platform Management Interface (IPMI)
This page contains a list of commonly used commands, although where a dedicated tool is available (such as HP's hpacucli that should probably be preferred
Retrieving ILOM IP address with ipmitool: ipmitool lan print Retrieving Sensor Data: ipmitool sdr Or to include alarm thresholds: ipmitool sensor Get Hardware Information: ipmitool fru print Retrieve the System Event Log (SEL): ipmitool sel List Authorised Users: ipmitool user List active ILOM Sessions: ipmitool session info all Reset the ILOM: ipmitool mc reset warm or ipmitool mc reset cold