#!/bin/bash

#	Purpose: to breakout multiple entries from a CSV with a single 'key' value
#
#	Example File
#		someserver.domain.com,10.20.30.40,192.168.1.100
#		mailserver.domain.com,10.20.30.41,192.168.1.101,172.168.12.12
#		backupserver.domain.com,10.20.30.45
#
#	Example Output
#		someserver.domain.com,10.20.30.40
#		someserver.domain.com,192.168.1.100
#		mailserver.domain.com,10.20.30.41
#		mailserver.domain.com,192.168.1.101
#		mailserver.domain.com,172.168.12.12
#		backupserver.domain.com,10.20.30.45
#

## counter variable
counter=0;
currHost="";

for i in $(cat somelist.csv); do
	## reset counter
    counter=0; currHost="";
	## break up the line
    line=$(echo $i | tr "," "\n");
    for l in $line; do
        ## set host header line
        if [[ "$counter" == "0" ]]; then currHost="$l";
        else echo "$currHost,$l"; fi
		## increment counter, most moot after counter > 0
        counter=$((counter+1));
    done
done