Usage:
  hostinfo [-a] [-n] [-l] [-1] [-{x|o|d}] [-{X|O|D|N}] [-p] <host> [<host>...]
  hostinfo --help
  hostinfo --version

Find and print name, IP address(es), and aliases (if any) of each
specified host.  By default, first try to interpret <host> as a
numeric dotted-quad IPv4 address.  If <host> doesn't appear to be a
numeric IP address, assume it is a hostname to look up.  The -N option
forces <host> to be interpreted as a hostname.

Host information comes from the gethostbyname(3) and/or
gethostbyaddr(3) function calls.  These function calls use some
combination of both the "hosts database" (usually, '/etc/hosts'
and/or NIS/NIS+), and, if available, the system's DNS resolver.  What
combination and in what order is configured in an operating-system
dependent manner (and is outside the scope of this program).

If none of -a, -n, or -l are given, host information prints out in a
well-labelled, human-readable format.  For example:

   address: 127.0.0.1
  hostname: localhost
   aliases: localhost.localdomain

If you use one or more of the -a, -n, or -l options, host information
prints in a more compact format, with requested fields separated by
tab characters.  For example:

  127.0.0.1	localhost	localhost.localdomain

Note that some hostnames map to multiple IP addresses.  By default,
hostinfo prints a separate record for each address.  Use the -1 option
to cause only the first address to be printed.

The -p option causes hostinfo to interpret each host as an IP address,
skip the lookup stage, and print the address in the requested format.
Together with the -x/-o/-d and -X/-O/-D options, this turns hostinfo
into a quick tool for converting between IP address formats.

Options:
  -a, --address             Print only the IP address(es) of each host.

  -n, --name                Print only the name of each host.

  -l, --aliases             Print only the aliases, if any, for each host.

  -1, --first-address       If a host has multiple IP addresses, only
                            display the first one.

  -x, --print-hexadecimal   Print IP addresses in hexadecimal (base 16).

  -o, --print-octal         Print IP addresses in octal (base 8).

  -d, --print-decimal       Print IP addresses in decimal (base 10).  This
                            is the default.

  -X, --expect-hexadecimal  Try to interpret <host> as a hexadecimal (base
                            16) IP address, in the format 'wwxxyyzz'
                            (e.g., 7f000001).

  -O, --expect-octal        Try to interpret <host> as an octal (base 8)
                            IP address, in the format '\qqq\rrr\sss\ttt'
                            (e.g., \177\000\000\001).

  -D, --expect-decimal      Try to interpret <host> as a decimal (base 10)
                            IP address, in the normal dotted-quad format
                            'nnn.mmm.ppp.rrr' (e.g., 127.0.0.1).  This is
                            the default.

  -N, --force-name          Don't try to interpret <host> as an IP address;
                            assume each specified host is a hostname.

  -p, --print               Don't try to look up <host>; if it's a valid
                            IP address, print it in the requested format
                            (decimal [default], hexadecimal, or octal).

  -h, --help                Display this builtin usage information.

  -V, --version             Display program version, copyright, and
                            warranty information.