21.4 hostid: Print numeric host identifier.

hostid prints the numeric identifier of the current host in hexadecimal. This command accepts no arguments. The only options are `--help' and `--version'. See section 2. Common options.

For example, here's what it prints on one system I use:

$ hostid 1bac013d

On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case.