GNU Info

(am-utils.info)host Selector Variable

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Enter node , (file) or (file)node

host Selector Variable
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   The local hostname as determined by gethostname(2).  If no domain
name was specified on the command line and the hostname contains a
period `.' then the string before the period is used as the host name,
and the string after the period is assigned to `${domain}'.  For
example, if the hostname is `styx.doc.ic.ac.uk' then `host' would be
`styx' and `domain' would be `doc.ic.ac.uk'.  `hostd' would be
`styx.doc.ic.ac.uk'.