awscript.sh

#!/bin/bash
#
# cat ips | xargs -I% sh -c "host %"
# -z True if it's a zero | -n True if it's not a zero!
#

PRG=${0##*/}

Usage() {
while read -r info; do
	printf "%b\n" "$info"
done <<-EOF
	\rSyntax:	$PRG -l [IPs/DOMAINS] -o [OutPut] [-v]		
	\r 			
	\rOptions:
	\r 		-h, --help		- Displays this 
	\r 		-l, --list 		- List of Domains ot IPs
	\r 		-o, --output 	- OutPut File
	\r 		-v, --verbose 	- Displays the current position of the Testing (Default:False)
	\rExample:
	\r 		$PRG -l domains.txt -o aws.txt -v
	\r
EOF
}

list=False
out=False
ver=False

while [ -n "$1" ]; do
	case $1 in
		-l|--list)
				[ -z $2 ] && { printf "The Argumant -l/--list, Asks for a Value!\n\n"; Usage; exit 1; }
				list=$2
				shift ;;
		-o|--output)
				[ -z $2 ] && { printf "The Argumant -o/--output, Asks for a Value!\n\n"; Usage; exit 1; }
				out=$2
				shift ;;
		-v|--verbose)
				ver=True;;
		-h|--help)
				Usage
				exit 0 ;;
	esac
	shift
done

[ $list == False ] && { Usage; exit 1; }
[ $out != False ] && rm $out 2>/dev/null

lines=$(wc -l < $list)
c=1
while read line; do
	[ $ver == True ] && { echo -ne "[$c/$lines] $line                                                 \r"; let c=c+1; }
	result=$(host $line | awk '/amazonaws.com.$/ {gsub(/\.$/,"",$NF); print $1 " | " $NF}')
	[ -n "$result" ] && { 
		echo $result 
		if [[ $out != False ]]; then 
			echo $result >> $out 
		fi
}
	
done < $list