#!/bin/sh

hostsfile="/etc/hosts"
syntax1="gethost: Get info from $hostsfile.  Required parm 1 is search string."
syntax2="Optional parm 2 is output type.  If output type is NOT supplied,"
syntax3="the whole line from $hostsfile is returned but '-rtr' and '-pc' names"
syntax4="are excluded.  If output type IS supplied, only that type is returned."
syntax5="Syntax: gethost {ip address | host name | mac address} {ip | name | mac}"

if [ -z $1 ]  # No parm 1
then
  echo
  echo $syntax1
  echo $syntax2
  echo $syntax3
  echo $syntax4
  echo
  echo $syntax5
  echo
  exit
fi


if [ -z $2 ]  # No parm 2 specified, so echo whole line, e.g. 
              # 192.168.168.80 lattin 00:06:25:11:FC:A5
then
  ip_name_mac=$(grep $1 $hostsfile | grep -v "\-rtr" | grep -v "\-pc")
  output=$ip_name_mac
else  # Parm 2 was specified
  ip_name_mac=$(grep $1 $hostsfile)

  if [ $2 = "ip" ]
  then
    output=$(echo $ip_name_mac | cut --delim=" " --fields=1)
  elif [ $2 = "name" ]
  then
    output=$(echo $ip_name_mac | cut --delim=" " --fields=2)
  elif [ $2 = "mac" ]
  then
    output=$(echo $ip_name_mac | cut --delim=" " --fields=3)
  else  # other/unknown
    output=$ip_name_mac
  fi
fi

echo $output
exit