Nmap IP Bash

#!/usr/bin/env bash
input=$1
output=$2
nmap_result=$3

echo "[*] Script started"

cat "$input" | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" > "$output"

# Add /24 cidr to end of each IP
sed -e 's,$,/24,' -i "$output"
cat "$output"
sudo nmap -sV -A -Pn -v -oN "$nmap_result" -iL "$output"
echo "[*] Done"