hostid

hostid prints the host's numeric identifier, in hexadecimal.

hostid

$ hostid
007f0100

The host id is a number associated with the system. It takes no options and prints one value.

Where hostname gives the system's name — meant to be read by people — hostid gives a numeric value, used by software that wants a machine identifier in a fixed numeric form.

Exit status #

hostid returns 0.