(coreutils.info)hostid invocation

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22.7 `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.