coreutils: hostid invocation

1 
1 21.6 ‘hostid’: Print numeric host identifier
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1 
1 ‘hostid’ prints the numeric identifier of the current host in
1 hexadecimal.  This command accepts no arguments.  The only options are
1 ‘--help’ and ‘--version’.  ⇒Common options.
1 
1    For example, here’s what it prints on one system I use:
1 
1      $ hostid
1      1bac013d
1 
1    On that system, the 32-bit quantity happens to be closely related to
1 the system’s Internet address, but that isn’t always the case.
1 
1    ‘hostid’ is installed only on systems that have the ‘gethostid’
1 function, so portable scripts should not rely on its existence.
1 
1    An exit status of zero indicates success, and a nonzero value
1 indicates failure.
1