hostid - phpMan

File: coreutils.info,  Node: hostid invocation,  Next: uptime invocation,  Prev: hostname invocation,  Up: System context
21.6 'hostid': Print numeric host identifier
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'hostid' prints the numeric identifier of the current host in
hexadecimal.  This command accepts no arguments.  The only options are
'--help' and '--version'.  *Note 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.
   An exit status of zero indicates success, and a nonzero value
indicates failure.