Get docker container IP addresses

get_container_ips.sh

#!/usr/bin/env bash
# Docker Container IP 
# Usage:
#  get_container_ips.sh   
#     Prints out all IPs for running containers
#
#  get_container_ips.sh <ID|name>     
#     Prints out the IP for a given container or ID
# https://docs.docker.com/engine/reference/commandline/ps/#formatting

function get_ip() {
   docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $1
}

if [ -z "$1" ] ; then
# list
 for container in $(docker ps --format "{{.ID}};{{.Names}}") ; do
    cid=$(echo "$container" | cut -d ';' -f1)
    name=$(echo "$container" | cut -d ';' -f2)
    echo -n "$name = "
    get_ip $cid
 done
else
 get_ip $1
fi