List your interfaces, and IP (v4) addresses if they're available.

getip.sh

#!/bin/bash

# Define color codes
GREEN='\033[0;32m'
RED='\033[0;31m'
NC='\033[0m' # No Color

# Run the ip -c a command and process its output
ip -c a | awk -v green="$GREEN" -v red="$RED" -v nc="$NC" '
/^[0-9]+:/ {
    # Print previous device if it had no IPv4 address
    if (dev != "" && !has_ipv4) {
        printf "%s: %sno IPv4 address%s\n", dev, red, nc
    }

    # Extract the device name and state
    match($0, /<([^>]*)>/, state)
    match($2, /([^:]+)/, device)
    dev = device[1]
    has_ipv4 = 0 # Reset IPv4 flag
    if (state[1] ~ /UP/) {
        dev_state = "UP"
    } else if (state[1] ~ /DOWN/) {
        dev_state = "DOWN"
    } else {
        dev_state = ""
    }
}

/inet / {
    # Extract the IPv4 address
    match($2, /([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/, ip)
    has_ipv4 = 1 # Set IPv4 flag
    if (dev_state == "UP") {
        printf "%s: %s%s%s\n", dev, green, ip[1], nc
    } else if (dev_state == "DOWN") {
        printf "%s: %sdown%s\n", dev, red, nc
    } else {
        print dev ": " ip[1]
    }
}

END {
    # Print the last device if it had no IPv4 address
    if (dev != "" && !has_ipv4) {
        printf "%s: %sno IPv4 address%s\n", dev, red, nc
    }
}
'