Shell script to ping a list of IP addresses provided in a text file

ping_list.sh

#!/bin/bash
# Usage: ./ping_list.sh FILE
#  FILE is a text file containing IP addresses, one per line, to be pinged

if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <file_with_ip_addresses>"
    exit 1
fi

FILE="$1"  # filename
if [ ! -f "$FILE" ]; then
    echo "Error: File '$FILE' not found!"
    exit 1
fi

# Arrays to store results
reachable=()
unreachable=()

while IFS= read -r ip_address; do
    # Ignore empty lines and lines starting with '#'
    if [[ -n "$ip_address" && "$ip_address" != \#* ]]; then
        echo "Pinging $ip_address..."
        if ping -c 5 -q "$ip_address" > /dev/null 2>&1; then
            echo "$ip_address is reachable."
            reachable+=("$ip_address")
        else
            echo "$ip_address is not reachable."
            unreachable+=("$ip_address")
        fi
        echo "---------------------------------"
    fi
done < "$FILE"

echo "Summary:"
echo "Reachable IP addresses:"
for ip in "${reachable[@]}"; do
    echo "- $ip"
done

echo ""
echo "Unreachable IP addresses:"
for ip in "${unreachable[@]}"; do
    echo "- $ip"
done

echo "Finished pinging all IP addresses."