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21.6 `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'.  *Note Common options::.

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

     $ hostid

   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.