Monitor you CPU and HardDisk Temperature from Terminal in Ubuntu/Linux Mint

Today's trick is about how to monitor your CPU and HardDisk Temperature from Command Line in Ubuntu/Linux Mint. hddtemp and acpi are the two utilities which are used to check HardDisk and CPU Temperature respectively.
Both hddtemp and acpi are small application and already present in Ubuntu repository, you need to install them before use. Lets see the installation and usage of hddtemp and acpi