#!/bin/sh

#!/bin/sh

# Define a function to get the first IPv4 address of a FreeBSD interface
get_ipv4address_freebsd() {
    local interface="$1"

    # Use ifconfig to get IPv4 addresses of the specified interface
    ipv4_addresses=$(ifconfig "$interface" | awk '/inet / {print $2}')

    # Extract the first IPv4 address
    first_ipv4_address=""
    for addr in $ipv4_addresses; do
        first_ipv4_address="$addr"
        break  # Exit after getting the first IPv4 address
    done

    # Return the first IPv4 address
    echo -n "$first_ipv4_address"
}


get_ipv4address_linux() {


    # Set the interface name you want to query
    local interface="$1"  # Replace with your desired interface

    # Use ip command to get IPv4 addresses of the specified interface
    ipv4_addresses=$(ip -4 addr show dev "$interface" | grep -oP 'inet \K[\d.]+')

    # Extract the first IPv4 address
    first_ipv4_address=""
    for addr in $ipv4_addresses; do
        first_ipv4_address="$addr"
        break  # Exit after getting the first IPv4 address
    done

    # Check if an address was found
    if [ -n "$first_ipv4_address" ]; then
        echo -n "$first_ipv4_address"
    else
        exit 1;
    fi
}


kernel_name=$(uname -s)
   interface="$1"  # Replace with your desired interface

if [ "$kernel_name" = "FreeBSD" ]; then
     result=$(get_ipv4address_freebsd "$interface")
else
     result=$(get_ipv4address_linux "$interface")
fi

echo -n "$result"