#!/bin/bash

#V0.1

OldHostField=''
OldKeyInfo=''
CurrentHostList=''

#Do not use sort -k2 -u ; mac os/x sort doesn't work correctly in this case
( sed -e 's/[[:space:]][[:space:]]*/ /g' | sort --key=2,3 | uniq ; echo ) \
 | while read HostField KeyInfo ; do
	if [ -n "$OldKeyInfo" -a "$OldKeyInfo" != "$KeyInfo" ]; then
		#Close out old line
		Pad=''
		if [ ${#CurrentHostList} -lt 80 ]; then
			for X in `seq ${#CurrentHostList} 80` ; do
				Pad="$Pad "
			done
		fi
		echo "$CurrentHostList$Pad $OldKeyInfo"
		CurrentHostList=''
	fi

	if [ "$CurrentHostList" != '' ]; then
		CurrentHostList="$CurrentHostList,"
	fi
	CurrentHostList="$CurrentHostList$HostField"

	OldHostField="$HostField"
	OldKeyInfo="$KeyInfo"
done